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Effects of crystal size and surface coverage of perovskites on electron recombination in solar cells

Title
Effects of crystal size and surface coverage of perovskites on electron recombination in solar cells
Author
장재영
Keywords
Perovskite solar cells; Crystal size; Surface coverage; Recombination
Issue Date
2019-05
Publisher
ELSEVIER SCIENCE BV
Citation
MATERIALS LETTERS, v. 242, Page. 191-194
Abstract
The crystal size and surface coverage of a perovskite layer at its interface with 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (sprio-MeOTAD) have been controlled by crystallization temperature (25, 40, 60 and 75 degrees C) during the conversion of PbI2 to MAPbI(3). The high crystallization temperature induces to form large crystals and vice versa. The highest efficiency (13.9%) was observed with the perovskite layer fabricated under 25 degrees C among four different temperature conditions. This is mostly because of the suppressed recombination through the formation of a rather compact layer with the small sized perovskite crystals, even though its reduced light absorption and electron conductivity to a small extent. The performance has been characterized by photovoltaic parameters with help of electrochemical impedance spectroscopy (EIS) to confirm that the charge recombination is a main parameter in controlling power conversion efficiency (PCE). (C) 2019 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0167577X19301752?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/111961
ISSN
0167-577X; 1873-4979
DOI
10.1016/j.matlet.2019.01.132
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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