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Full-Text Articles in Engineering
Single-Layered Organic Photovoltaics With Double Cascading Charge Transport Pathways: 18% Efficiencies, Ming Zhang, Lei Zhu, Guanqing Zhou, Tianyu Hao, Chaoqun Qiu, Zhe Zhao, Qin Hu, Bryon W. Larson, Haiming Zhu, Thomas P. Russell
Single-Layered Organic Photovoltaics With Double Cascading Charge Transport Pathways: 18% Efficiencies, Ming Zhang, Lei Zhu, Guanqing Zhou, Tianyu Hao, Chaoqun Qiu, Zhe Zhao, Qin Hu, Bryon W. Larson, Haiming Zhu, Thomas P. Russell
Polymer Science and Engineering Department Faculty Publication Series
The chemical structure of donors and acceptors limit the power conversion efficiencies achievable with active layers of binary donor-acceptor mixtures. Here, using quaternary blends, double cascading energy level alignment in bulk heterojunction organic photovoltaic active layers are realized, enabling efficient carrier splitting and transport. Numerous avenues to optimize light absorption, carrier transport, and charge-transfer state energy levels are opened by the chemical constitution of the components. Record-breaking PCEs of 18.07% are achieved where, by electronic structure and morphology optimization, simultaneous improvements of the open-circuit voltage, short-circuit current and fill factor occur. The donor and acceptor chemical structures afford control over …
The Effect Of Comb Architecture On Complex Coacervation, Brandon M. Johnston, Cameron W. Johnston, Rachel A. Letteri, Tyler K. Lytle, Charles E. Sing, Todd Emrick, Sarah L. Perry
The Effect Of Comb Architecture On Complex Coacervation, Brandon M. Johnston, Cameron W. Johnston, Rachel A. Letteri, Tyler K. Lytle, Charles E. Sing, Todd Emrick, Sarah L. Perry
Chemical Engineering Faculty Publication Series
Complex coacervation is a widely utilized technique for effecting phase separation, though predictive understanding of molecular-level details remains underdeveloped. Here, we couple coarse-grained Monte Carlo simulations with experimental efforts using a polypeptide-based model system to investigate how a comb-like architecture affects complex coacervation and coacervate stability. Specifically, the phase separation behavior of linear polycation-linear polyanion pairs was compared to that of comb polycation-linear polyanion and comb polycation-comb polyanion pairs. The comb architecture was found to mitigate cooperative interactions between oppositely charged polymers, as no discernible phase separation was observed for comb-comb pairs and complex coacervation of linear-linear pairs yielded stable …
Multi Rotor Wind Turbine Design And Cost Scaling, Preeti Verma
Multi Rotor Wind Turbine Design And Cost Scaling, Preeti Verma
Masters Theses 1911 - February 2014
The current generation wind turbines are upscaled into multi megawatt range in terms of output power. However, the energy benefit from the turbine is offset by the increased mass and cost. Twenty MW wind turbines are now feasible with rotor diameters up to 200 m, according to a new report from the EU-funded UpWind project in 2011. The question is, how much bigger can wind turbines get realistically? One concept worth considering, and the one that is the subject of this thesis, is to have more than one rotor on a single support structure. Such turbines could have a greater …
Wind Power, Susn Reyes
Wind Power, Susn Reyes
Science and Engineering Saturday Seminars
No abstract provided.
Analytical Modeling Of Tree Vibration Generated During Cutting Process, Payman Karvanirabori
Analytical Modeling Of Tree Vibration Generated During Cutting Process, Payman Karvanirabori
Masters Theses 1911 - February 2014
There are several ways to cut down a tree. The piece by piece cutting method is studied in this research. By modeling the cutting process into simple dynamic models and obtaining governing equations of motion of tree and cut piece in each model, the forces during cutting process were calculated. The method was then applied to a set of real data and tree vibrations were compared with field measurements. The study is very rare in the case of the variety of the topics it covers from dynamics and mechanics to finite element modeling of a biological system.