Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Hybrid organic-inorganic hybrid materials, particularly the perovskite family, have shown great promise for use in field-effect transistors, light-emitting diodes, lasers, tandems with silicon, plasmonics, sensors and photodetectors. Recently, the power conversion efficiency of lead halide perovskite based thin film photovoltaic devices has skyrocketed from 3.8% to 21% in just a few years. To date, progress has been made on each layer, with major emphasis on perovskite film processing and relevant material design.
Despite significant efforts dedicated towards development of new hole transporting materials the field is still dominated by costly 2,2´,7,7´-tetrakis(N,N-di-p-methoxyphenylamine)-9-9´-spirobifluorene (spiro-OMeTAD) and even more expensive poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA).
High cost of these HTM arises from the prohibitively expensive synthesis and purification procedures used. For example, spiro-OMeTAD is synthesized in five reaction steps that require low temperature, sensitive and aggressive reagents. In addition, high-purity sublimation-grade spiro-OMeTAD is required to obtain high-performance devices.
Here we report a new type of branched hole transporting molecules, based on methoxydiphenylamine-substituted fluorene and carbazole units, with PSC power conversion efficiency of up to 19.96 %. Furthermore, the investigated hole transporting materials were synthesized in two steps from commercially available and relatively inexpensive starting reagents, resulting in up to fivefold cost reduction of the final product compared with spiro-OMeTAD. High solubility in organic solvents and ease of preparation makes these HTM very appealing for commercial prospects of perovskite solar cells.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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