期刊
NANO ENERGY
卷 79, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105400
关键词
Perovskite; Tandem solar cell; Current matching; ALD; Metal oxides; Optics
类别
资金
- Research Grants Council of Hong Kong, China [152093/18E]
- Hong Kong Polytechnic University [G-YBVG]
- Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China (the science and technology innovation commission of Shenzhen) [JCY20180306173805740]
- UCONN's Office of the Vice President for Research (OVPR) through the Research Excellence Program (REP)
This study focuses on the realization of highly efficient perovskite/perovskite tandem solar cells, by selecting appropriate material bandgaps, preparing charge transport/contact materials, and utilizing optical and electrical simulations to improve device performance.
Perovskite/perovskite tandem solar cells (Pk/Pk TSCs) have a substantial potential to outperform the ShockleyQueisser limit of single-junction solar cells. However, optimum material bandgap selection and device processability impede the progress in acquiring efficient Pk/Pk TSCs. The choice of charge transport/contact materials additionally has a significant influence on the photovoltaic performance of Pk/Pk TSCs. Hence, the actual fabrication of a two-terminal Pk/Pk TSC becomes tricky, which requires a detailed understanding of the underlying optical and electrical properties of the device. In this study, a wide bandgap (similar to 1.72 eV) lead iodinebromide (Pb-I-Br) and a narrow bandgap (similar to 1.16 eV) tin lead-iodide (Sn-Pb-I) perovskite absorbers are considered as potential sub-cells for realizing highly efficient planar Pk/Pk TSCs. Furthermore, energetically associated hole and electron selective contacts are prepared by atomic layer deposition (ALD) of metal oxides. The optics of solar cells is investigated by three-dimensional finite-difference time-domain (FDTD) optical simulations, and finite element method (FEM) electrical simulations are exploited to determine realistic photovoltaic performance parameters. A comprehensive study is carried out to provide a complete guideline for the realization of energy conversion efficiency exceeding 30% in Pk/Pk TSCs.
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