期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 11, 页码 5940-5947出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b00480
关键词
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资金
- Indo-UK APEX project
- UKIERI project
- EPSRC
- Magdalene College, Cambridge
- Cambridge Trust
- China Scholarship Council
- DST Nanomission Thematic Unit
- DST-CERI programs, Govt. of India
- Energy Oriented Centre of Excellence (EoCoE) [676629]
- European Union
- EPSRC [EP/K016288/1, EP/R020485/1, EP/M005143/1] Funding Source: UKRI
Solar cells and optoelectronics based on lead halide perovskites are generating considerable interest but face challenges with the use of toxic lead. In this study, we fabricate and characterize lead-free perovskites based on germanium and tin solid solutions, CH3NH3Sn(1-x)GexI3 (0 <= x <= 1). We show that these perovskite compounds possess band gaps from 1.3 to 2.0 eV, which are suitable for a range of optoelectronic applications, from single junction devices and top cells for tandems to light-emitting layers. Their thermodynamic stability and electronic properties are calculated for all compositions and agree well with our experimental measurements. Our findings demonstrate an attractive family of lead-free perovskite semiconductors with a favorable band-gap range for efficient single-junction solar cells.
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