Heterogeneous photoresponse of individual grain in all-inorganic perovskite solar cells

Photoresponse is affected by the microscopic structure and orientation of the perovskite crystals, but it is difficult to quantify the individual grain size and always acts as homogeneous. Using scanning probe microscopy, the local electrical properties of individual grains in all-inorganic perovski...

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Veröffentlicht in:Applied physics letters 2020-08, Vol.117 (8), Article 083902
Hauptverfasser: Wang, Yanyan, Hu, Ziyang, Yao, Wenlong, Yang, Cheng, Zhang, Houcheng, Zhang, Jing, Zhu, Yuejin
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Sprache:eng
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Zusammenfassung:Photoresponse is affected by the microscopic structure and orientation of the perovskite crystals, but it is difficult to quantify the individual grain size and always acts as homogeneous. Using scanning probe microscopy, the local electrical properties of individual grains in all-inorganic perovskites are mapped. Surface potential variations on lateral distance scales within or larger than one grain size are presented. Among perovskite grains, three discrete photoconductivity levels are identified, corresponding to the facet-dependent density of trap states, which was further demonstrated by the light intensity dependence of the local current–voltage curve of each grain.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0014187