Open Air Processed Perovskite Solar Cells using Dopant-Free and High Mobility Hydrophobic hole-transporting materials
Rajendrakumar Gunasekaran a, Prabakar Kandsamy a
a Pusan National University, School of Electrical Engineering, Pusan, 609735, Korea, Republic of
nanoGe Fall Meeting
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
Oral, Prabakar Kandsamy, presentation 296
DOI: https://doi.org/10.29363/nanoge.ngfm.2019.296
Publication date: 16th July 2019

The effect of moisture and oxygen in the air has a severe impact on the stability of the solution processed perovskite. Developing efficient and stable air processed perovskite solar cells (PSC) desperately requires robust hole-transporting materials (HTM) with high hole mobility and hydrophobicity.  Here, we present dopant free, highly hydrophobic, donor-π-acceptor conducting polymeric HTMs. Due to the synergistic impact of linear long alkyl chains with different π-spacers, the HTMs retard interfacial charge recombination, resulting long carrier lifetime with uniform films coverage due to rich solubility. In addition, these HTMs possess a deeper higher occupied molecular orbital for efficient hole extraction.  As a result, the power conversion efficiency has reached 16% under AM1.5 G without any additives in fully open air processed cells.  The influence of thiophene and selenophene π-spacers on the charge carrier extraction and recombination mechanisms is discussed.   Our findings highlight the better energy transfer capabilities of additive-free hole transporters as a promising candidate for developing stable PSCs in the open air.The effect of moisture and oxygen in the air has a severe impact on the stability of the solution processed perovskite. Developing efficient and stable air processed perovskite solar cells (PSC) desperately requires robust hole-transporting materials (HTM) with high hole mobility and hydrophobicity.  Here, we present dopant free, highly hydrophobic, donor-π-acceptor conducting polymeric HTMs. Due to the synergistic impact of linear long alkyl chains with different π-spacers, the HTMs retard interfacial charge recombination, resulting long carrier lifetime with uniform films coverage due to rich solubility. In addition, these HTMs possess a deeper higher occupied molecular orbital for efficient hole extraction.  As a result, the power conversion efficiency has reached 16% under AM1.5 G without any additives in fully open air processed cells.  The influence of thiophene and selenophene π-spacers on the charge carrier extraction and recombination mechanisms is discussed.   Our findings highlight the better energy transfer capabilities of additive-free hole transporters as a promising candidate for developing stable PSCs in the open air.

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