| Autor: |
Chen, Shan-Long, Xu, Ai-Chun, Tao, Jie, Tao, Hai-Jun, Shen, Yi-Zhou, Zhu, Lu-Min, Jiang, Jia-Jia, Wang, Tao, Pan, Lei |
| Předmět: |
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| Zdroj: |
Green Chemistry; 5/7/2016, Vol. 18 Issue 9, p2793-2801, 9p |
| Abstrakt: |
Kesterite-structure Cu2ZnSnS4 (CZTS) has been proved to be a high-performance Pt-free counter electrode (CE) material for dye-sensitized solar cells (DSSCs). Herein, a green but powerful two-step method based on solvothermal treatment was proposed to synthesize semi-transparent two-dimensional (2D) leaf-like CZTS plate arrays (PLAr) in situ on a FTO glass substrate, without any post-treatments, such as annealing, toxic sulfurization, or coating with other ancillary materials. The growth mechanism of the 2D leaf-like CZTS PLAr based on solvothermal treatment was illustrated. A power conversion efficiency (PCE) of 7.09% was obtained by utilizing leaf-like CZTS PLAr as the CE. Surprisingly, the PCE increased to 8.67% assisted by a mirror reflection. The excellent performance of DSSCs could be attributed to the high catalytic surface area, fast photo-generated electron transport at the counter electrode/redox electrolyte interface, remarkable electrocatalytic activity for I3− reduction, low charge transfer resistance toward the reduction of I3− ions, and high diffusion coefficient of the I3−. This work provides a green and feasible approach to construct high-quality metal sulfide nanoarrays on arbitrary conductive substrates under mild conditions (i.e. low temperature, no annealing, green, speediness) and promotes the development of Pt-free sulfide materials for sustainable photovoltaic applications. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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