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Full-Text Articles in Materials Science and Engineering
Solution-Based Assembly Of Conjugated Polymers Into Nanofibers For Organic Electronics, Daniel E. Acevedo Cartagena
Solution-Based Assembly Of Conjugated Polymers Into Nanofibers For Organic Electronics, Daniel E. Acevedo Cartagena
Doctoral Dissertations
Solution-based crystallization of conjugated polymers offers a scalable and attractive route to develop hierarchical structures for electronic devices. The introduction of well-defined nucleation sites into metastable solutions provides a way to regulate the crystallization behavior, and therefore the morphology of the material. A crystallization method for generating metastable solutions of poly(3-hexylthiophene) (P3HT) was established. These metastable solutions allow P3HT to selectively crystallize into nanofibers (NFs) on graphene-coated surfaces. It was found that the crystallization kinetics is faster with increasing P3HT molecular weight and concentration. Through in situ atomic force microscopy, it was confirmed that NFs grow vertically in a face-on …
Strategies For Controlling Bulk Heterojunction Morphology, Zach Daniel Seibers
Strategies For Controlling Bulk Heterojunction Morphology, Zach Daniel Seibers
Doctoral Dissertations
Organic photovoltaic devices have been extensively studied as a means to produce sustainable energy. However, the performance of organic-photovoltaic (OPV) devices is dependent upon a number of factors including the morphology of the active layer, device architecture, and processing conditions. Recent research has indicated that fullerenes in the bulk heterojunction are entropically driven to the silicon and air interfaces upon crystallization of P3HT, which occurs during thermal annealing. The first chapter of this research focuses on investigating the structure and function of end-tethered poly(3-hexylthiophene) chains to a transparent electrode as an anode buffer layer. Neutron reactivity reveals that these P3HT …
Bulk Heterojunctions In Photovoltaic Devices, Ondrej Edward Dyck
Bulk Heterojunctions In Photovoltaic Devices, Ondrej Edward Dyck
Doctoral Dissertations
Current solar cells, on the market today, have little room for improved efficiency or cost reduction. Part of this is due to the costly manufacture of high purity silicon and the current fabrication methods for solar cells. Solution processable solar cells would mark a great stride forward to cost reduction. If such cells can be demonstrated to be efficient enough and stable enough it would be a turning point in history. However, solution processable devices still need much work before they can compete in the market. This text addresses characterization problems in the TEM, covers a study dealing with optimization …