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Published on: April 25, 2018
Highly efficient Zn2SnO4 perovskite solar cells through band alignment engineering
Jie Dou1, Ying Zhang, Qiong Wang
1Fujian Provincial Key Laboratory of Electrochemcial Energy Storage Materials, Fuzhou University, Fuzhou, Fujian 350002, China. wei-mingdeng@fzu.edu.cn.
Researchers developed a narrow band gap halide perovskite solar cell with improved energy alignment, achieving 19.37% efficiency. Cesium incorporation further boosted performance to 20.26% in a novel triple cation perovskite.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
- Tuning the band gap and energy level alignment is crucial for enhancing PSC efficiency.
- Zinc tin oxide (Zn2SnO4) is an emerging electron transport material for PSCs.
Purpose of the Study:
- To engineer an active absorption layer with a narrow band gap in halide perovskites.
- To optimize energy alignment between the perovskite absorber and the Zn2SnO4 electron transport layer.
- To achieve high power conversion efficiency in perovskite solar cells.
Main Methods:
- Adjusting the halide ratio in halide perovskites to tune the band gap.
- Fabricating perovskite solar cells utilizing a Zn2SnO4 electron transport layer.
- Incorporating cesium to form a triple cation perovskite composition.
Main Results:
- A narrow band gap halide perovskite with improved energy alignment to Zn2SnO4 was successfully synthesized.
- A power conversion efficiency of 19.37% was achieved with the optimized halide perovskite.
- The incorporation of cesium into the perovskite structure resulted in a triple cation perovskite with a further improved efficiency of 20.26%.
Conclusions:
- Optimizing halide composition in perovskites is effective for band gap engineering and enhancing solar cell performance.
- The Zn2SnO4 electron transport layer exhibits favorable energy alignment with tailored perovskite absorbers.
- Cesium incorporation offers a viable strategy for developing high-efficiency triple cation perovskite solar cells.
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