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Synthesis and Characterization of Composite Nanomaterials as Interfacial Layers in Organic Solar Cells

出版	2019
URL	http://books.google.com.hk/books?id=iTsg0AEACAAJ&hl=&source=gbs_api

註釋This thesis deals with the chemical synthesis of new metal-based nanocrystals and the incorporation of these solution processed materials as hole transport layers (HTLs) and electron transport layers (ETL) in Organic Solar Cells (OSCs). Several strategies were applied to increase the efficiency of the OSCs such as the incorporation of suitable interfacial layers. Interfacial layers were mainly prepared through vacuum deposition methods such as thermal evaporation, however, they require complex equipment, which limits their use in low-cost, large area device fabrications. Therefore, the solution processed interfacial materials have attracted significant attention to overcome the problems of vacuum depositions. During this work, we focused the HTL studies on the synthesis of NiOx nanocrystals. We synthesized pristine NiOx as well as Li, Cu and Sn doped NiOx nanoparticles at different doping levels. By following a specific strategy, we were able to transform the dispersion from water into isopropanol that can be easily deposited onto the active layer. Molecular doping was used to improve the work function using F4-TCNQ molecule. After optimizations, 7.4% and 7.9% efficiencies were obtained with the regular and the inverted device structures, respectively. As for the ETL studies, we focused this work on the development of a new class of organic-inorganic hybrid materials. Three types of antimony-based hybrid materials were synthesized and crystallized using a slow evaporation method and then solubilized as nanocrystals in alcohols, before being used in both regular and inverted devices giving 8.19% and 6% efficiencies, respectively, for the best working hybrid material.