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Enhanced carrier transport over grain boundaries in lead-free CH3NH3Sn(I1-xBrx)(3) (0 <= x <= 1) perovskite solar cells

Title
Enhanced carrier transport over grain boundaries in lead-free CH3NH3Sn(I1-xBrx)(3) (0 <= x <= 1) perovskite solar cells
Authors
Nguyen, Bich PhuongJung, Hye RiKim, JuranJo, William
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2019
Journal Title
NANOTECHNOLOGY
ISSN
0957-4484JCR Link

1361-6528JCR Link
Citation
NANOTECHNOLOGY vol. 30, no. 31
Keywords
tin-based perovskitegrain boundarygrain sizeband bendingcharge separation and collection
Publisher
IOP PUBLISHING LTD
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
This paper reports on grain boundary (GB) roles in lead-free tin halide perovskite thin films. Nano scale spatial mapping of charge separation efficiency in methylammonium tin halide (MASn(I1-xBrx)(3), MA = CH3NH3) thin films were constructed by Kelvin probe force microscopy and conductive atomic force microscopy (C-AFM). We observed downward band bending at GBs under dark conditions and higher surface photovoltage along the GBs, confirmed by C-AFM which showed high local current flows along the GBs. The band bending degree and local current intensity were affected by the Br/I ratio. Photo-generated carriers were more effectively separated and collected at GBs with increased Br content, and hysteresis was observed in Br-rich Sn-halide perovskite.
DOI
10.1088/1361-6528/ab19dd
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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