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- Inverted device structure (4)
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- Polaron lifetime (1)
- Polyhedral oligomeric silsesquioxane (1)
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Articles 1 - 30 of 42
Full-Text Articles in Engineering
Donor--Acceptor Conjugated Polymer Based On Naphtho [1, 2-C: 5, 6-C] Bis [1, 2, 5] Thiadiazole For High-Performance Polymer Solar Cells, Ming Wang, Xiaowen Hu, Peng Liu, Wei Li, Xiong Gong, Fei Huang, Yong Cao
Donor--Acceptor Conjugated Polymer Based On Naphtho [1, 2-C: 5, 6-C] Bis [1, 2, 5] Thiadiazole For High-Performance Polymer Solar Cells, Ming Wang, Xiaowen Hu, Peng Liu, Wei Li, Xiong Gong, Fei Huang, Yong Cao
Xiong Gong
Donor–acceptor conjugated polymers PBDT-DTBT and PBDT-DTNT, based on 2,1,3-benzothiadiazole (BT) and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NT), have been designed and synthesized for polymer solar cells. NT contains two fused 1,2,5-thiadiazole rings that lower the band gap, enhance the interchain packing, and improve the charge mobility of the resulting polymer. Consequently, the NT-based polymer PBDT-DTNT exhibited considerably better photovoltaic performance with a power conversion efficiency (PCE) of 6.00% when compared with the BT-based polymer PBDT-DTBT, which gave a PCE of 2.11% under identical device configurations.
Synthesis Of Tetrachloro-Azapentacene As An Ambipolar Organic Semiconductor With High And Balanced Carrier Mobilities, Cheng-Li Song, Chong-Bo Ma, Feng Yang, Wei-Jing Zheng, Hao-Li Zhang, Xiong Gong
Synthesis Of Tetrachloro-Azapentacene As An Ambipolar Organic Semiconductor With High And Balanced Carrier Mobilities, Cheng-Li Song, Chong-Bo Ma, Feng Yang, Wei-Jing Zheng, Hao-Li Zhang, Xiong Gong
Xiong Gong
Two new azapentacene derivatives 9,10-dibromo-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (a) and 8,9,10,11-tetrachloro-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (b) were synthesized, and their FET properties were investigated. Compound b exhibits high and balanced ambipolar transport properties, with the hole and electron mobilities reaching up to 0.12 and 0.14 cm2 V–1 s–1, respectively. This work suggests that chlorination to the N-heteropentacene framework is an efficient way for producing high performance ambipolar organic semiconductors.
Zinc Oxide Nanowire As An Electron-Extraction Layer For Broadband Polymer Photodetectors With An Inverted Device Structure, Tingbin Yang, Ke Sun, Xilan Liu, Wei Wei, Tianzhi Yu, Xiong Gong, Deli Wang, Yong Cao
Zinc Oxide Nanowire As An Electron-Extraction Layer For Broadband Polymer Photodetectors With An Inverted Device Structure, Tingbin Yang, Ke Sun, Xilan Liu, Wei Wei, Tianzhi Yu, Xiong Gong, Deli Wang, Yong Cao
Xiong Gong
We report the fabrication of high-performance broadband polymer photodetectors based on narrow bandgap conjugated polymers with an inverted device structure, where electrons and holes are collected on indium tin oxide and metal contact with high work function. High-quality wide bandgap vertically aligned ZnO nanowire array offers an enhanced surface area and is used as the cathode buffer layer in this device for effectively extracting electrons and blocking holes from the active polymer layer. The room-temperature detectivity of polymer photodetectors with such an inverted device structure is greater than 1010 Jones with the spectral response from 400 to 1450 nm. Our …
Methods And Devices Comprising Soluble Conjugated Polymers, Xiong Gong
Methods And Devices Comprising Soluble Conjugated Polymers, Xiong Gong
Xiong Gong
Methods, compositions and articles of manufacture involving soluble conjugated polymers are provided. The conjugated polymers have a sufficient density of polar substituents to render them soluble in a polar medium, for example water and/or methanol. The conjugated polymer may desirably comprise monomers which alter its conductivity properties. In some embodiments, the inventors have provided cationic conjugated polymers (CCPs) comprising both solubilizing groups and conductive groups, resulting in conductive conjugated polymers soluble in polar media. The different solubility properties of these polymers allow their deposition in solution in multilayer formats with other conjugated polymers. Also provided are articles of manufacture comprising …
Solution-Processed Near-Infrared Polymer Photodetectors With An Inverted Device Structure, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, I-Fan Hsieh, Stephen Cheng, Xiong Gong
Solution-Processed Near-Infrared Polymer Photodetectors With An Inverted Device Structure, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, I-Fan Hsieh, Stephen Cheng, Xiong Gong
Xiong Gong
Solution-processed near-infrared polymer photodetectors with an inverted device structure were designed and fabricated. By introducing ZnOx and MoO3 as an electron extraction layer and a hole extraction layer, respectively, the asymmetric characteristics of the inverted polymer photodetectors was constructed. Operating at room temperature, the inverted polymer photodetectors exhibited the detectivity over 1012 cm Hz1/2/W from 400 to 850 nm, resulting from the enhanced photocurrent and reduced dark current induced by fabricating photoactive layer from solution with processing additive 1,8-diiodooctane. These device performances were comparable to those of inorganic counterparts.
Multilayer Polymer Light-Emitting Diodes For Solid State Lighting Applications, Xiong Gong
Multilayer Polymer Light-Emitting Diodes For Solid State Lighting Applications, Xiong Gong
Xiong Gong
Multilayer polymer light-emitting diodes (PLEDs) are demonstrated using semiconducting polymers blended with organometallic emitters as the emissive layer and one or both of an electron transport layer and a hole transparent layer on the appropriate electron injection and hole injection sides of the emissive layer. The transport layers reduce energy potential gaps between the hole injection electrode and the emissive polymer and between the electron injection electrode and the emissive polymer. A solvent-processing based procedure for preparing these devices is also disclosed It uses nonpolar solvent-based solutions of emissive polymers to form the emissive layer and polar solvent-based solutions to …
Towards High Performance Inverted Polymer Solar Cells, Xiong Gong
Towards High Performance Inverted Polymer Solar Cells, Xiong Gong
Xiong Gong
Bulk heterojunction (BHJ) polymer solar cells (PSCs) that can be fabricated by solution processing techniques are under intense investigation in both academic institutions and industrial companies because of their potential to enable mass production of flexible and cost-effective alternative to silicon-based solar cells. A combination of novel polymer development, nanoscale morphology control and processing optimization has led to over 8% of power conversion efficiencies (PCEs) for BHJ PSCs with a conventional device structure. Attempts to develop PSCs with an inverted device structure as required for achieving high PCEs and good stability have, however, met with limited success. Here, we report …
Novel Silafluorene-Based Conjugated Polymers With Pendant Acceptor Groups For High Performance Solar Cells, Xiong Gong
Novel Silafluorene-Based Conjugated Polymers With Pendant Acceptor Groups For High Performance Solar Cells, Xiong Gong
Xiong Gong
Two low-band-gap conjugated polymers, PSiFDCN and PSiFDTA, which consist of alternating silafluorene and triphenylamine backbone and different pendant acceptor groups (malononitrile and 1,3-diethyl-2-thiobarbituric acid) with styrylthiophene as π-bridge, were synthesized and characterized. By changing the acceptor groups in side chain, the energy levels, absorption spectra, and band gaps of the resulted polymers were effectively tuned. As the strength of the acceptors increases, the band gap reduces from 1.83 eV for PSiFDCN to 1.74 eV for PSiFDTA. Bulk heterojunction solar cells with these polymers as electron donor and (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) as electron acceptor exhibit high Voc (>0.85 …
Image Storage Based On Biphotonic Holography In Azo/Polymer System, Xiong Gong
Image Storage Based On Biphotonic Holography In Azo/Polymer System, Xiong Gong
Xiong Gong
Image storage has been investigated with the biphotonic holographic method in an azo/polymer film. Experimental results show that this biphotonic holographic storage has high spatial resolution and exhibits an image enhancement effect after blocking the noncoherent light. The mechanism of biphotonic holographic storage is attributed to the redistribution of cis form azo molecules induced by both coherent light and noncoherent light.
System And Methods For Improving The Qualities Of Polymer Light-Emitting Electrochemical Cells, Xiong Gong
System And Methods For Improving The Qualities Of Polymer Light-Emitting Electrochemical Cells, Xiong Gong
Xiong Gong
A light-emitting device comprising a pair of electrodes, and an emitting polymer active layer between the pair of electrodes, and either a) an electron transport layer, b) a hole transport layer, or c) a low work function material layer, wherein said emitting polymer layer comprising a single phase combination of a light-emitting polymer and an ionic liquid, is provided. Such multilayered devices have increased stability at relatively high voltages, fast turn-on times, low operating voltage, high brightness and long lifetimes.
Enhanced Electron Injection In Polymer Light-Emitting Diodes: Polyhedral Oligomeric Silsesquioxanes As Dilute Additives, Xiong Gong
Xiong Gong
By blending monochlorocyclohexyl- polyhedral oligomeric silsesquioxanes (MCC-POSS) into poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1.4-phenylenevinylene (MEH-PPV), enhanced luminous efficiency (LE, cd A−1) and brightness were observed in polymer light-emitting diodes (PLEDs) using Al as the cathode. PLEDs made from MEH-PPV with 0.5 wt.% of MCC-POSS exhibit LE of 1 cd A−1, four times higher than that observed in simple MEH-PPV devices. x-ray diffraction studies, measurements of photovoltaic response and measurements of photoconductivity from the films of pure MEH-PPV and MEH-PPV with MCC-POSS demonstrated that the improved device performance results from mixing of MCC-POSS with MEH-PPV. The enhanced electron-injection into the emissive layer results from the effect …
Preparation And Photoluminescence Of Nanocrystalline Mso 4: Xtb 3+(M= Ca, Sr, And Ba; X= 0.001--0.005), Xiong Gong
Preparation And Photoluminescence Of Nanocrystalline Mso 4: Xtb 3+(M= Ca, Sr, And Ba; X= 0.001--0.005), Xiong Gong
Xiong Gong
A series of nanocrystalline MSO4:xTb3+ (M=Ca, Sr, and Ba; x=0.001-0.005) samples have been prepared by the co-precipitation method following low-temperature treatment. The x-ray diffraction technique yielded an average grain size of approximately 24 nm. Based upon the experimental data and theoretical calculations, it is concluded that the photoluminescence quenching in nanocrystalline MSO4:xTb3+ results from the dipole-quadrupole interaction.
An Electrochemical Super Sandwich Assay For Sensitive And Selective Dna Detection In Complex Matrices, Xiong Gong
An Electrochemical Super Sandwich Assay For Sensitive And Selective Dna Detection In Complex Matrices, Xiong Gong
Xiong Gong
In a traditional sandwich assay, a DNA target hybridizes to a single copy of the signal probe. Here we employ a modified signal probe containing a methylene blue (a redox moiety) label and a “sticky end.” When a DNA target hybridizes this signal probe, the sticky end remains free to hybridize another target leading to the creation of a supersandwich structure containing multiple labels. This leads to large signal amplification upon monitoring by voltammetry.
A Porphyrin--Fullerene Dyad With A Supramolecular Double-Cable Structure As A Novel Electron Acceptor For Bulk Heterojunction Polymer Solar Cells, Chien-Lung Wang, Wen-Bin Zhang, Ryan Van Horn, Yingfeng Tu, Xiong Gong, Stephen Cheng, Yanming Sun, Minghong Tong, Junghwa Seo, Ben Hsu, Alan Heeger
A Porphyrin--Fullerene Dyad With A Supramolecular Double-Cable Structure As A Novel Electron Acceptor For Bulk Heterojunction Polymer Solar Cells, Chien-Lung Wang, Wen-Bin Zhang, Ryan Van Horn, Yingfeng Tu, Xiong Gong, Stephen Cheng, Yanming Sun, Minghong Tong, Junghwa Seo, Ben Hsu, Alan Heeger
Xiong Gong
With a supramolecular “double-cable” structure in the solid state, a light harvesting porphyrin-fullerene dyad is demonstrated to be a promising candidate for new electron acceptors in high-performance bulk heterojunction (BHJ) polymer solar cells (PSCs). It has long-lived mobile carriers, a high short circuit current, and a large open circuit voltage.
Organic Photoresponse Materials And Devices, Huanli Dong, Hongfei Zhu, Qing Meng, Xiong Gong, Wenping Hu
Organic Photoresponse Materials And Devices, Huanli Dong, Hongfei Zhu, Qing Meng, Xiong Gong, Wenping Hu
Xiong Gong
Organic photoresponse materials and devices are critically important to organic optoelectronics and energy crises. The activities of photoresponse in organic materials can be summarized in three effects, photoconductive, photovoltaic and optical memory effects. Correspondingly, devices based on the three effects can be divided into (i) photoconductive devices such as photodetectors, photoreceptors, photoswitches and phototransistors, (ii) photovoltaic devices such as organic solar cells, and (iii) optical data storage devices. It is expected that this systematic analysis of photoresponse materials and devices could be a guide for the better understanding of structure–property relationships of organic materials and provide key clues for the …
High-Performance Polymer Light-Emitting Diodes Fabricated With A Polymer Hole Injection Layer, Xiong Gong
High-Performance Polymer Light-Emitting Diodes Fabricated With A Polymer Hole Injection Layer, Xiong Gong
Xiong Gong
Enhanced luminance (L) and luminous efficiency (LE) of polymer light-emitting diodes(PLEDs) is demonstrated using poly(bis(tetraphenyldiamino)biphenyl-perfluorocyclobutane), poly(BTPD-Si-PFCB), as the hole injection layer. The monomer is cast directly onto the indium-tin-oxide anode and thermally polymerized in situ. Hole injection from poly(BTPD-Si-PFCB) into the “super yellow” derivative of poly(phenylene vinylene) and into several blue-emitting polymers is comparable to or better than that from poly(ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSSA). With poly(BTPD-Si-PFCB) as the hole injecting layer into “super yellow,” the performance is identical to that obtained with PEDOT:PSSA (LE≈8 cd/A with little fall-off, even at L>104 cd/m2)
Polymer Solar Cells With An Inverted Device Configuration Using Polyhedral Oligomeric Silsesquioxane-[60] Fullerene Dyad As A Novel Electron Acceptor, Wen-Bin Zhang, Yingfeng Tu, Hao-Jan Sun, Kan Yue, Xiong Gong, Stephen Cheng
Polymer Solar Cells With An Inverted Device Configuration Using Polyhedral Oligomeric Silsesquioxane-[60] Fullerene Dyad As A Novel Electron Acceptor, Wen-Bin Zhang, Yingfeng Tu, Hao-Jan Sun, Kan Yue, Xiong Gong, Stephen Cheng
Xiong Gong
A polyhedral oligomeric silsesquioxane-[60]fullerene (POSS-C60) dyad was designed and used as a novel electron acceptor for bulk heterojunction (BHJ) polymer solar cells (PSCs) with an inverted device configuration. The studies of time-resolved photoinduced absorption of the pristine thin film of poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(4,7-bis (2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl] (SiPCPDTBT) and the composite thin film of SiPCPDTBT:POSS-C60 indicated efficient electron transfer from SiPCPDTBT to POSS-C60 with inhibited back-transfer. BHJ PSCs made by SiPCPDTBT mixed with POSS-C60 yielded the power conversion efficiencies (PCEs) of 1.50%. Under the same operational conditions, PCEs observed from BHJ PSCs made by SiPCPDTBT mixed with [6,6]-phenyl-C61-butyric acid methyl ester were 0.92%. These results …
Solution-Processed Cross-Linkable Hole Selective Layer For Polymer Solar Cells In The Inverted Structure, Xiong Gong
Solution-Processed Cross-Linkable Hole Selective Layer For Polymer Solar Cells In The Inverted Structure, Xiong Gong
Xiong Gong
Solution-processed cross-linkable tetraphenyldiamine-containing material (TPD-BVB) as a highly efficient hole selective transport layer was demonstrated. Polymersolar cells (PSCs) with an inverted structure fabricated with a thin cross-linked TPD-BVB film show comparable efficiency and superior long-term air stability when compared to devices fabricated with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). Thus, solution-processed TPD-BVB is an attractive alternative to PEDOT:PSS as a hole extraction layer in inverted structure PSCs.
Electronic And Light-Emitting Properties Of Some Polyimides Based On Bis (2, 2': 6', 2''-Terpyridine) Ruthenium (Ii) Complex, Xiong Gong
Xiong Gong
A series of novel aromatic polyimides that contain bis(2,2′:6′,2″-terpyridine) ruthenium(II) complex was synthesized, and their optoelectronic properties were studied. The absorption of the polymers at 500 nm was strongly enhanced by the ruthenium complex. As a result, the photosensitivity of the polymers in the visible region is increased, as can be seen from the increase in photoconductivity. The glass transition temperature of the polymers is approximately 220°C and they also exhibit modest thermal stabilities. The electron and hole carrier mobilities of polyimides are on the order of 10 -4 cm 2 V -1 s -1, which suggests that the electron-withdrawing …
Synthesis And Photophysical Properties Of Some Conjugated Polymers Functionalized With Ruthenium Polypyridine Complexes, Xiong Gong
Xiong Gong
A series of conjugated polymers functionalized with different ruthenium polypyridine metal complexes were synthesized by the palladium catalyzed reaction. Two conjugated polymer systems have been studied: 1. poly(phenylenevinylene) with bis(2,2':6',2”-terpyridine) ruthenium (II) on the mainchain and 2. quinoxaline based polymers with tris(2,2'-bipyridine) ruthenium (II). The ruthenium polypyridine complexes exhibit a long-lived metal to ligand charge transfer excited state which can enhance the photosensitivity of the resulting polymers. Different physical properties such as the photoconductivity and charge mobility in these polymers are also studied.
Conference Paper: Quinoxaline-Based Conjugated Polymers Containing Ruthenium (Ii) Bipyridine Metal Complex, Xiong Gong
Conference Paper: Quinoxaline-Based Conjugated Polymers Containing Ruthenium (Ii) Bipyridine Metal Complex, Xiong Gong
Xiong Gong
No abstract provided.
Phosphorescence From Iridium Complexes Doped Into Polymer Blends, Xiong Gong
Phosphorescence From Iridium Complexes Doped Into Polymer Blends, Xiong Gong
Xiong Gong
Energy transfer from the polymer blends, poly(vinylcarbazole) (PVK) with 2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazol (PBD), to an organometallic emitter, tris[9,9-dihexyl-2-(phenyl-4′-(-pyridin-2′′-yl))fluorene]iridium (III) [Ir(DPPF)3], is investigated by steady-state and time-resolvedphotoluminescence (PL) spectroscopy. A redshifted PL and slow fluorescence decay are due to the formation of an exciplex in PVK-PBD blends. A decrease in intensity in polymer blends observed at 425 nm with increasing concentrations of Ir(DPPF)3 and an evident rising feature observed in films with 1 wt % Ir(DPPF)3 in the range of 578 to 615 nm within a 200 ns timescale indicate that efficient Förster energy transfer from exciplex to Ir(DPPF)3 occurs. The electrophosphorescent light-emitting …
Red Electrophosphorescence From A Soluble Binaphthol Derivative As Host And Iridium Complex As Guest, Xiong Gong
Red Electrophosphorescence From A Soluble Binaphthol Derivative As Host And Iridium Complex As Guest, Xiong Gong
Xiong Gong
The investigation of the optical properties, carrier injection, and transport into a soluble small molecule, 6,6'-dicarbazolyl-2,2'-dihexyloxy-1,1'-binaphthol (BA), was reported. The results demonstrated that BA is a blue-emitting molecule, which can be used as a host for the fabrication of electrophosphorescent light-emitting diodes (LEDs). The single-layer electrophosphorescent LEDs fabricated from toluene solution containing BA with tris[2,5-bis-2'-(9',9'-dihexylfluorene)pyridine-kappa(2)NC(3)(')]iridium(III) [Ir(HFP)(3)] emitted red light from Ir(HFP)(3) triplet emission. The results from photoluminescence (PL) and electroluminescence (EL) demonstrated that the dominated operational mechanism in EL was charge trapping rather than Förster transfer, which was the dominated mechanism in PL. The single-layer OLEDs with 1wt % of …
Large Open-Circuit Voltage Polymer Solar Cells By Poly (3-Hexylthiophene) With Multi-Adducts Fullerenes, Xiong Gong, Tianzhi Yu, Yong Cao, Alan Heeger
Large Open-Circuit Voltage Polymer Solar Cells By Poly (3-Hexylthiophene) With Multi-Adducts Fullerenes, Xiong Gong, Tianzhi Yu, Yong Cao, Alan Heeger
Xiong Gong
Polymer solar cells (PSCs) made by poly(3-hexylthiophene) (P3HT) with multi-adducts fullerenes, [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM), PC61BM-bisadduct (bisPC61BM) and PC61BM-trisadduct (trisPC61BM), were reported. Electrochemistry studies indicated that PC61BM, bisPC61BM and trisPC61BM had step-up distributional lowest unoccupied molecular orbital (LUMO) energy. PSCs made by P3HT with above PC61BMs show a trend of enlarged open-circuit voltages, which is in good agreement with the energy difference between the LUMO of PC61BMs and the HOMO of P3HT. On the contrary, reduced short-circuit currents (J sc) were observed. The investigation of photo responsibility, dynamics analysis based on photo-induced absorption of composite films, P3HT:PC61BMs and n-channel …
Biphotonic Self-Diffraction In Azo-Doped Polymer Film, Xiong Gong
Biphotonic Self-Diffraction In Azo-Doped Polymer Film, Xiong Gong
Xiong Gong
A new nonlinear optical phenomenon, biphotonic self-diffraction (BSD), is reported in azo dye doped in polymer matrix. The first-order and the second-order BSD signals are observed in the experiment. It is demonstrated that the dynamic behaviors of the BSD signals are dependent on the cis-trans isomerization of azo molecules by two color lights.
High And Balanced Hole And Electron Mobilities From Ambipolar Thin-Film Transistors Based On Nitrogen-Containing Oligoacences, Yi-Yang Liu, Cheng-Li Song, Wei-Jing Zeng, Kai-Ge Zhou, Za-Fa Shi, Chong-Bo Ma, Feng Yang, Hao-Li Zhang, Xiong Gong
High And Balanced Hole And Electron Mobilities From Ambipolar Thin-Film Transistors Based On Nitrogen-Containing Oligoacences, Yi-Yang Liu, Cheng-Li Song, Wei-Jing Zeng, Kai-Ge Zhou, Za-Fa Shi, Chong-Bo Ma, Feng Yang, Hao-Li Zhang, Xiong Gong
Xiong Gong
We demonstrate a strategy for designing high-performance, ambipolar, acene-based field-effect transistor (FET) materials, which is based on the replacement of C−H moieties by nitrogen atoms in oligoacenes. By using this strategy, two organic semiconductors, 6,13-bis(triisopropylsilylethynyl)anthradipyridine (1) and 8,9,10,11-tetrafluoro-6,13-bis(triisopropylsilylethynyl)-1-azapentacene (3), were synthesized and their FET characteristics studied. Both materials exhibit high and balanced hole and electron mobilities, 1 having μh and μe of 0.11 and 0.15 cm2/V·s and 3 having μh and μe of 0.08 and 0.09 cm2/V·s, respectively. The successful demonstration of high and balanced ambipolar FET properties from nitrogen-containing oligoacenes opens up new opportunities for designing high-performance ambipolar organic …
Solution-Processed Ultrasensitive Polymer Photodetectors With High External Quantum Efficiency And Detectivity, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, Xiong Gong
Solution-Processed Ultrasensitive Polymer Photodetectors With High External Quantum Efficiency And Detectivity, Xilan Liu, Hangxing Wang, Tingbin Yang, Wei Zhang, Xiong Gong
Xiong Gong
Operating at room temperature, polymer photodetectors (PDs) with external quantum efficiency approximately 80%, detectivity over 1013 Jones, linear dynamic range over 120 dB, and dark current a few decades of nA/cm2 were demonstrated. All these performance parameters were achieved by combined treatment of active layer with solvent vapor annealing and of polymer PDs with postproduction thermal annealing. These high performance parameters demonstrated that polymer PDs is comparable to or better than inorganic counterparts.
Water/Methanol-Soluble Conjugated Copolymer As An Electron-Transport Layer In Polymer Light-Emitting Diodes, Xiong Gong
Water/Methanol-Soluble Conjugated Copolymer As An Electron-Transport Layer In Polymer Light-Emitting Diodes, Xiong Gong
Xiong Gong
Multilayer polymer light-emitting diodes are made using semiconducting polymers. An emissive polymer layer is cast from solution in an organic solvent, and a water-soluble (or methanol- soluble) conjugated copolymer is used for the electron transport layer (ETL) in the following device configuration: (indium tin oxide)/poly(3,4-ethylenedioxythiophene)/emissive polymer/ETL/Ba/Al. Devices with an ETL have significantly lower turn-on voltages, higher brightness values, and improved luminous efficiencies.
Organic Materials And Chemistry For Bulk Heterojunction Solar Cells, Chun-Hui Duan, Fei Huang, Yong Cao, Niyazi Sariciftci, Yongfang Li, Guillermo Bazan, Xiong Gong
Organic Materials And Chemistry For Bulk Heterojunction Solar Cells, Chun-Hui Duan, Fei Huang, Yong Cao, Niyazi Sariciftci, Yongfang Li, Guillermo Bazan, Xiong Gong
Xiong Gong
No abstract provided.
A Supramolecular Double-Cable Structure With A 12944 Helix In A Columnar Porphyrin-C60 Dyad And Its Application In Polymer Solar Cells, Xiong Gong
Xiong Gong
A novel porphyrin-C60 dyad (PCD1) is designed and synthesized to investigate and manipulate the supramolecular structure where geometrically isotropic [such as [60]fullerene (C60)] and anisotropic [such as porphyrin (Por)] units coexist. It is observed that PCD1 possesses an enantiomeric phase behavior. The melting temperature of the stable PCD1 thermotropic phase is 160 °C with a latent heat (ΔH) of 18.5 kJ mol−1. The phase formation is majorly driven by the cooperative intermolecular Por–Por and C60–C60 interactions. Structural analysis reveals that this stable phase possesses a supramolecular “double-cable” structure with one p-type Por core columnar channel and three helical n-type C60 …