期刊
NANOSCALE RESEARCH LETTERS
卷 12, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/s11671-017-1912-4
关键词
ZnO/CH3NH3PbI3 coaxial nanowires; Nonuniform effect; Carrier separation efficiency; Solar cell
资金
- National Key Research and Development Program of China [2016YFB0400801]
- National Natural Science Foundation of China [61227009, 61674124]
- Natural Science Foundation of Fujian Province of China [2015 J01028]
- Fundamental Research Funds for the Central Universities [20720150027, 20720150033, 20720160044, 20720160122]
Coaxial structures exhibit great potential for the application of high-efficiency solar cells due to the novel mechanism of radial charge separation. Here, we intensively investigate the nonuniform effect of carrier separation efficiency (CSE) and light absorption in perovskite-based type-II coaxial nanowire solar cells (ZnO/CH3NH3PbI3). Results show that the CSE rapidly decreases along the radial direction in the shell, and the value at the outer side becomes extremely low for the thick shell. Besides, the position of the main light absorption gradually moves to the outer side with the increase of the shell thickness. As a result, the external quantum efficiency shows a positional dependence with a maximal value close to the border of the nanowire. Eventually, in our case, it is found that the maximal power conversion efficiency of the solar cells reduces from 19.5 to 17.9% under the effect of the nonuniformity of CSE and light absorption. This work provides a basis for the design of high-efficiency solar cells, especially type-II nanowire solar cells.
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