Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.296
Publication date: 18th 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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