期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 23, 页码 20664-20669出版社
AMER CHEMICAL SOC
DOI: 10.1021/am503963b
关键词
Cu2ZnSnSxSe4-x; crystallization; counter electrode; dye-sensitized solar cells
资金
- National Natural Science Foundation of China [21203053, 21271064, 61306016]
- Joint Talent Cultivation Funds of NSFC-HN [U1204214]
- Program for Changjiang Scholars and Innovative Research Team in University of Henan University [PCS IRT1126]
Cu2ZnSnSxSe4-x (CZTSSe) counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) are commonly developed with porous structures, but their high surface area could also retard electron transport processes owing to the abundant grain boundaries. Herein, we employed a convenient solution method and a rapid heating process to prepare well crystalline CZTSSe CEs in DSSCs. The influence of crystallization of CZTSSe film on DSSCs performances was discussed in depth. The thermogravimetric analysis, phase morphology, conductivity, and electrochemical characteristics of CZTSSe films were performed. It is found that the rapid heating process is beneficial to the formation of well crystalline film with large grains. As the porosity and grain boundaries in the bulk film are dramatically reduced with the enhanced crystallization, the charge transport process is gradually improved. Using cyclic voltammogram and electrochemical impedance spectroscopy measurements, we propose that the accelerating charge transport is of great importance to the photovoltaic performances of DSSCs due to their superior electrocatalytic activities. As the highest cell efficiency was achieved, well crystalline CZTSSe is an efficient CE catalytic material.
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