Polymeric triphenylamine derivatives for perovskite solar cells
Taisuke Matsui a, Ieva Petrikyte b, Tadas Malinauskas b, Konrad Domanski c, Maryte Daskeviciene b, Matas Steponaitis b, Paul Gratia d, Wolfgang Tress c, Juan-Pablo Correa-Baena e, Antonio Abate c, Anders Hagfeldt e, Michael Graetzel c, Mohammad Khaja Nazeeruddin e, Vytautas Getautis b, Michael Saliba c d
a Advanced Research Division, Materials Research Laboratory, Panasonic Corporation, 1006 Kadoma, Kadoma City, Osaka 571-8501, Japan
b Department of Organic Chemistry, Kaunas University of Technology, Radvilenu pl. 19, Kaunas, 50254, Lithuania
c Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland
d Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
e Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland, Lausanne, Switzerland
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#PERFuDe19. Halide perovskites: when theory meets experiment from fundamentals to devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Claudine Katan, Wolfgang Tress and Simone Meloni
Poster, Matas Steponaitis, 330
Publication date: 18th July 2019

Rapid development of technologies and their influence on people's lives is increasingly associated with energy demand. In order to meet this growing energy demand and minimize related costs new and effective energy generation methods are necessary. Among several alternative sources, photovoltaics are among the most promising, as solar energy is free and inexhaustible energy source. Perovskite solar cells often consist of several layers, each having a specific function and made of materials that meet a certain set of requirements. Some of those requirements include the stability issue, which derives from additives that are used in the process of increasing the conductivity of hole transporting materials.

Having that in mind triarylamine derivative polymers with different functional groups were synthetized as hole transport materials (HTMs) for perovskite solar cells (PSCs). The novel materials enabled efficient PSCs without the use of chemical doping to enhance the charge transport. Devices employing poly(triarylamine) with methylphenylethenyl functional groups showed better power conversion efficiency then widely used additive-free compound - poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA). Notably, devices with the foremost polymer enabled stable PSCs under 1 sun at maximum power point tracking for ~40 hours and under elevated temperature (85 °C) for more than 140 hours. The results present remarkable progress towards stable PSC under real working conditions, which is crucial for industrial application.

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