Journal
NATURE ENERGY
Volume 2, Issue 4, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2017.46
Keywords
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Funding
- Major State Basic Research Development Program of China [2016YFB0700700, 2016YFA0204000]
- National Natural Science Foundation of China [91433105, 61322401, 11474273, 51602114]
- Special Fund for Strategic New Development of Shenzhen, China [JCYJ20160414102210144]
- Youth Innovation Promotion Association of CAS [2017154]
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Sb2Se3, a binary compound containing non-toxic and Earth-abundant constituents, is a promising absorber material for low-cost, high-efficiency photovoltaics. Current Sb2Se3 thin-film solar cells use toxic CdS as the buffer layer and suffer from unsatisfactory stability. Here we selected ZnO as the buffer layer and constructed superstrate Sb2Se3 solar cells with a certified power conversion efficiency of 5.93%. Randomly oriented ZnO produced by spray pyrolysis induced the growth of Sb2Se3 with preferred [221] orientation, and hence resulted in devices with fewer interfacial defects and better efficiency. Moreover, our unencapsulated device survived the stringent damp-heat (85 degrees C, 85% humidity, 1,100 h), light-soaking (50 degrees C, 1.3 sun, 1,100 h), thermal cycling, and ultraviolet preconditioning tests. The combined features of stability, Earth-abundant constituent and potentially low-cost manufacturing highlight the great potential of Sb2Se3 solar cell as a possible non-toxic alternative to CdTe photovoltaics.
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