期刊
NANO LETTERS
卷 21, 期 18, 页码 7845-7854出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02897
关键词
perovskite; organic; tandem solar cell; interconnecting layer; efficiency; stability
类别
资金
- National Natural Science Foundation of China [51861145101, 21774097, 52073221]
- Fundamental Research Funds for the Central Universities [WUT: 2021III016JC]
- Welsh Government's Ser Cymru II Rising Star and Capacity Builder Accelerator Programs through European Regional Development Fund
- Welsh European Funding Office
- United Kingdom Research and Innovation through the Engineering and Physical Sciences Research Council [EP/T028511/1]
Building perovskite/organic tandem solar cells can enhance light absorption range and reduce photovoltage loss. The material of hole transport layer plays a critical role in efficiency.
The photovoltaic performance of inorganic perovskite solar cells (PSCs) still lags behind the organic-inorganic hybrid PSCs due to limited light absorption of wide bandgap CsPbI3-xBrx under solar illumination. Constructing tandem devices with organic solar cells can effectively extend light absorption toward the long-wavelength region and reduce radiative photovoltage loss. Herein, we utilize wide-bandgap CsPbI2Br semiconductor and narrow-bandgap PM6:Y6-BO blend to fabricate perovskite/organic tandem solar cells with an efficiency of 21.1% and a very small tandem open-circuit voltage loss of 0.06 V. We demonstrate that the hole transport material of the interconnecting layers plays a critical role in determining efficiency, with polyTPD being superior to PBDB-T-Si and D18 due to its low parasitic absorption, sufficient hole mobility and quasi-Ohmic contact to suppress charge accumulation and voltage loss within the tandem device. These perovskite/organic tandem devices also display superior storage, thermal and ultraviolet stabilities.
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