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Efficient carrier separation and intriguing switching of bound charges in inorganic-organic lead halide solar cells

Title
Efficient carrier separation and intriguing switching of bound charges in inorganic-organic lead halide solar cells
Authors
Kim G.Y.Oh S.H.Nguyen B.P.Jo W.Kim B.J.Lee D.G.Jung H.S.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2015
Journal Title
Journal of Physical Chemistry Letters
ISSN
1948-7185JCR Link
Citation
vol. 6, no. 12, pp. 2355 - 2362
Keywords
grain boundary propertieshysteretic propertiesmesoporous perovskite solar cellpolarizationscanning probe microscopy
Publisher
American Chemical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We fabricated a mesoporous perovskite solar cell with a ∼14% conversion efficiency, and we investigated its beneficial grain boundary properties of the perovskite solar cells through the use of scanning probe microscopy. The CH<inf>3</inf>NH<inf>3</inf>Pb(I<inf>0.88</inf>,Br<inf>0.12</inf>)<inf>3</inf> showed a significant potential barrier bending at the grain boundary and induced passivation. The potential difference value in the x = 0.00 sample is ∼50 mV, and the distribution of the positive potential is lower than that of the x = 0.12 sample. We also investigated the polarization and hysteretic properties of the perovskite thin films by measuring the local piezoresponse. Specifically, the charged grain boundaries play a beneficial role in electron-hole depairing and in suppressing recombination in order to realize high-efficiency perovskite solar cells. © 2015 American Chemical Society.
DOI
10.1021/acs.jpclett.5b00967
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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