Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Three novel triphenylamine-based hole transport materials (HTMs), BTPA-4, BTPA-5, and BTPA-6, were synthesized through a facile two-step procedure with low cost starting materials. Different from the spirobifluorene core in commonly-used spiro-OMeTAD, spiro(fluorene-9,9-xanthene) skeleton was employed in these three materials as the central bridge. More than 70° water contact angle rendered these three HTMs to effectively protect the corresponding solar cell devices from humidity. Moreover, thermogravimetric analysis of these three materials shows that they decompose above 300 °C. We systematically studied the effect of the chemical structure of the HTMs on the perovskite solar cell performance by varying the conjugated system and the number of terminated triphenylamine charge transporting components. Although central bridge in BTPA-6 was somewhat more twisted out-of-plane compared with BTPA-4 and BTPA-5 which generated the hypsochromic shift of BTPA-6, BTPA-6 exhibited better solar cell performance (12.10%) than BTPA-4 and BTPA-5, which is also comparable to the cell fabricated with expensive spiro-OMeTAD(13.25%). The present results highlight BTPA-6 as highly competitive HTMs for future large scale application in 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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