期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 194, 期 -, 页码 168-176出版社
ELSEVIER
DOI: 10.1016/j.solmat.2019.02.014
关键词
Double perovskite absorbers; Energy band-aligned multi-heterojunction; Optical absorption; Charge extraction and recombination; Device performance stability
资金
- National Natural Science Foundation of China [51872171, 51702228]
- Tai Shan Scholar Foundation of Shandong Province
- Shandong Province Natural Science Foundation [ZR201801290005, ZR2017BEM014]
- Talent Introduction Project of Taishan University [Y-01-2018017]
- Tai'an Science and Technology Development Plan [2018GX0075]
- Shandong Province Higher Educational Science and Technology Program [J17KA023]
An original CsPbIxBr3-x/FAPbI(y)Br(3-y), absorber is designed to form C-60/CsPbIxBr3-x/FAPbI(y)Br(3-y) multi-hetero-junction perovskite solar cells with optimized energy band alignment by precisely adjusting I:Br proportion in these two perovskite absorbers. The introduction of CsPbIxBr3-x. can not only improve the optical response, but also act as an electron transport conductor to form a band-matched cascade electron extractor with C-60. Optimized optical response and well-matched energy levels greatly enhance carrier transport and reduce carrier recombination, affording a high PCE of 17.48%, with high V-OC, J(SC), FF and excellent device stability simultaneously. Our results shed light on the importance of the interface engineering on the electron excitation and extraction of perovskite layers and describe an innovative approach to further boost the efficiency of perovskite solar cells.
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