期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 1, 页码 243-249出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b00926
关键词
perovskite/silicon tandem solar cells; high open-circuit voltage; Cs-doped perovskite film; silicon heterojunction; surface passivation; minority carrier lifetime
资金
- National Natural Science Foundation of China [61474065, 61674084]
- Tianjin Research Key Program of Science and Technology [18ZXJMTG00220]
- 111 Project [B16027]
- Fundamental Research Funds for the Central Universities
Perovskite/silicon tandem solar cells with high theoretical efficiency, low cost, and the potential for simple mass production have received significant attention. To maintain the current matching, increasing the open-circuit voltage (V-OC) of the top and bottom subcells is an effective route to enhance the efficiency of tandem solar cells (TSCs). In this paper, we focus on a strategy for increasing the V-OC and simultaneously maintaining a high efficiency of over 20%. Perovskite thin films with added Cs in traditional FAMA cations have shown a large grain, smooth surface morphology, wider band gap, and reduced defects, which together bring about a TSC V-OC of 1.78 V. In addition, the high minority carrier lifetime (tau(eff)) of bottom silicon solar cells resulting from the good passivation of a-Si:H/c-Si interface enhance the V-OC values to as high as 1.83 V, which is the highest value for perovskite/silicon TSCs.
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