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Trapping charges at grain boundaries and degradation of CH3NH3Pb(I1-xBr x )3 perovskite solar cells

Title
Trapping charges at grain boundaries and degradation of CH3NH3Pb(I1-xBr x )3 perovskite solar cells
Authors
Nguyen B.P.Kim G.Y.Jo W.Kim B.J.Jung H.S.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2017
Journal Title
Nanotechnology
ISSN
0957-4484JCR Link
Citation
vol. 28, no. 31
Keywords
Kelvin probe force microscopyperovskite solar cellsstability
Publisher
Institute of Physics Publishing
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The electrical properties of CH3NH3Pb(I1-xBr x )3 (x = 0.13) perovskite materials were investigated under ambient conditions. The local work function and the local current were measured using Kelvin probe force microscopy and conductive atomic force microscopy, respectively. The degradation of the perovskite layers depends on their grain size. As the material degrades, an additional peak in the surface potential appears simultaneously with a sudden increase and subsequent relaxation of the local current. The potential bending at the grain boundaries and the intragrains is the most likely reason for the change of the local current surface of the perovskite layers. The improved understanding of the degradation mechanism garnered from this study helps pave the way toward an improved photo-conversion efficiency in perovskite solar cells. © 2017 IOP Publishing Ltd.
DOI
10.1088/1361-6528/aa727e
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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