Triphenylamine-containing Molecules with Spiro [Fluorene-9,9'-xanthene] as a Conjugated System for Efficient Perovskite Solar Cells
Joe Otsuki a, Guohua Wu a, Ryuji Kaneko a, Ashraful Islam b
a Nihon University, 1-8-14 Kanda Surugadai, Tokyo, 101
b National Institute for Materials Science (NIMS),, Sengen 1-2-1, Tsukuba
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster 109
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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