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Kwon, Tae-Hyuk
Energy Recognition Lab.
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Surface State-Mediated Charge Transfer of Cs2SnI6 and Its Application in Dye-Sensitized Solar Cells

Author(s)
Shin, HyeonOhKim, Byung-ManJamg, TaehyungKim, Kwang MinRoh, Deok-HoNam, Jung SeungKim, Jeong SooKim, Un-YoungLee ByunghongPang, YoonsooKwon, Tae-Hyuk
Issued Date
2019-01
DOI
10.1002/aenm.201803243
URI
https://scholarworks.unist.ac.kr/handle/201301/25573
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201803243
Citation
ADVANCED ENERGY MATERIALS, v.9, no.3, pp.1803243
Abstract
A vacancy-ordered double perovskite, Cs2SnI6, has emerged as a promising lead-free perovskite in the optoelectronic field. However, the charge transfer kinetics mediated by its surface state remains unclear. Here, the charge transfer mechanism of Cs2SnI6 is reported and the role of its surface state in the presence of a redox mediator is clarified. Specifically, charge transfer through the surface state of Cs2SnI6 and its subsequent surface state charging are demonstrated by cyclic voltammetry and Mott-Schottky measurements, respectively. Because it is expected that the surface state of Cs2SnI6 is capable of regenerating oxidized organic dyes, a Cs2SnI6-based regenerator is developed for a dye-sensitized solar cell composed of fluorine-doped tin oxide (FTO)/dyed mesoporous TiO2/regenerator/poly(3,4-ethylenedioxythiophene)/FTO. As expected, the performance of the Cs2SnI6-based regenerator is strongly dependent on the highest occupied molecular orbital of the dyes. Consequently, Cs2SnI6 shows efficient charge transfer with a thermodynamically favorable charge acceptor level, achieving a 79% enhancement in the photocurrent density (14.1 mA cm(-2)) compared with that of a conventional liquid electrolyte (7.9 mA cm(-2)). The results suggest that the surface state of Cs2SnI6 is the main charge transfer pathway in the presence of a redox mediator and should be considered in future designs of Cs2SnI6-based devices.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1614-6832
Keyword (Author)
charge transferCs2SnI6dye-sensitized solar cellssurface states
Keyword
TRAP STATESPEROVSKITEEFFICIENCYDEFECTSIODIDESEMICONDUCTORSNANOCRYSTALSOXIDATION

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