Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 122, Issue 11, Pages 5940-5947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b00480
Keywords
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Funding
- 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
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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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