BROWSE

Related Researcher

Author's Photo

Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications

ITEM VIEW & DOWNLOAD

Surface State-Mediated Charge Transfer of Cs2SnI6 and Its Application in Dye-Sensitized Solar Cells

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Surface State-Mediated Charge Transfer of Cs2SnI6 and Its Application in Dye-Sensitized Solar Cells
Author
Shin, HyeonOhKim, Byung-ManJamg, TaehyungKim, Kwang MinRoh, Deok-HoNam, Jung SeungKim, Jeong SooKim, Un-YoungLee ByunghongPang, YoonsooKwon, Tae-Hyuk
Issue Date
2019-01
Publisher
WILEY-V C H VERLAG GMBH
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/25573
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201803243
DOI
10.1002/aenm.201803243
ISSN
1614-6832
Appears in Collections:
CHM_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU