Journal
ADVANCED MATERIALS TECHNOLOGIES
Volume 4, Issue 9, Pages -Publisher
WILEY
DOI: 10.1002/admt.201900311
Keywords
conjugated polymer; CsPbI2Br; high efficiency; Lewis base; perovskite solar cells
Categories
Funding
- National Key Research and Development Program of China [2016YFA0202403]
- National Natural Science Foundation of China [61704101/91733301]
- Natural Science Foundation of Shaanxi Province [2017JM6020]
- Fundamental Research Funds for the Central Universities [GK201702003/GK201603053]
- 111 Project B [14041]
- DNL Cooperation Fund CAS [DNL180311]
- Natural Science Foundation of Shaanxi Provincial Department of Education [2017KW-023]
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Inorganic cesium lead halide perovskite solar cells (PSCs), such as CsPbI2Br, have made a striking breakthrough with a power conversion efficiency of over 16%. However, CsPbI2Br is known to be very sensitive to moisture, and the intrinsic long-term stability of CsPbI2Br film remains a critical challenge. Interface engineering has been proven to be an effective way for solving the instability-to-moisture issue and enhancing the performance of inorganic-organic hybrid PSCs, while there are a few reports on interface engineering for inorganic PSCs. Here, a conjugated polymer, poly(N-alkyldiketopyrrolo-pyrrole dithienylthieno[3,2-b]thio-phene) (DPP-DTT), with high mobility is introduced as a novel interface passivation for CsPbI2Br PSCs, which can significantly reduce nonradiative recombination in perovskite, leading to significant enhancement in both efficiency and stability of CsPbI2Br PSCs. Through DPP-DTT passivation, a champion efficiency of 15.14% is obtained in CsPbI2Br PSCs. Moreover, the Lewis base DPP-DTT can serve as an ultrahydrophobic agent to hold the photovoltaic performance of CsPbI2Br PSCs under ambient environment with humidity or thermal stress. These results provide a simple while highly effective route of fabricating the highly efficient and stable inorganic PSCs.
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