期刊
ADVANCED MATERIALS
卷 30, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800258
关键词
low toxicity; passivation; perovskite solar cells; ternary perovskite
类别
资金
- Natural Science Foundation of China [91733301, 61674109, 11675252, 11605278]
- National Key RAMP
- D Program of China [2016YFA0202400]
- Natural Science Foundation of Jiangsu Province [BK20170059]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- EPSRC [EP/N020863/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N020863/1] Funding Source: researchfish
Exploiting organic/inorganic hybrid perovskite solar cells (PSCs) with reduced Pb content is very important for developing environment-friendly photovoltaics. Utilizing of Pb-Sn alloying perovskite is considered as an efficient route to reduce the risk of ecosystem pollution. However, the trade-off between device performance and Sn substitution ratio due to the instability of Sn2+ is a current dilemma. Here, for the first time, the highly efficient Pb-Sn-Cu ternary PSCs are reported by partial replacing of PbI2 with SnI2 and CuBr2. Sn2+ substitution results in a redshift of the absorption onset, whereas worsens the film quality. Interestingly, Cu2+ introduction can passivate the trap sites at the crystal boundaries of Pb-Sn perovskites effectively. Consequently, a power conversion efficiency as high as 21.08% in inverted planar Pb-Sn-Cu ternary PSCs is approached. The finding opens a new route toward the fabrication of high efficiency Pb-Sn alloying perovskite solar cells by Cu2+ passivation.
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