期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201803243
关键词
charge transfer; Cs2SnI6; dye-sensitized solar cells; surface states
类别
资金
- Korea Institute of Energy Technology Evaluation and Planning [20143030011560, 20183010013900]
- National Research Foundation (NRF) of Korea [NRF-2016R1A2B4009239, NRF-2017M3A7B4052802]
- NRF - Ministry of Science, ICT & Future Planning [NRF-2016M1A2A2940910, NRF-2017M1A2A2087813]
- Ulsan City of UNIST (Ulsan National Institute of Science Technology) [1.180030.01]
- GIST Research Institute (GRI) - GIST
- Korea Evaluation Institute of Industrial Technology (KEIT) [20183010013900] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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