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Light Processing Enables Efficient Carbon-Based, All-Inorganic Planar CsPbIBr2 Solar Cells with High Photovoltages
Qianni Zhang1, Weidong Zhu1, Dazheng Chen1
1State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics , Xidian University , Xi'an 710071 , China.
ACS Applied Materials & Interfaces
|January 1, 2019
Summary
A novel light-processing technique enhances inorganic halide perovskite (CsPbIBr2) solar cells. This method improves film quality, boosting power conversion efficiency (PCE) and open-circuit voltage (Voc) for stable, low-cost solar applications.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inorganic halide perovskites like CsPbIBr2 offer a balance of band gap and stability for efficient solar cells.
- Current CsPbIBr2 solar cells suffer from low efficiency due to significant energy loss, limiting open-circuit voltage (Voc).
- All-inorganic solar cells free from hole-transporting layers and noble-metal electrodes are desirable for cost-effectiveness and stability.
Purpose of the Study:
- To develop a light-processing technology to overcome energy loss issues in CsPbIBr2 solar cells.
- To improve the film quality, crystallinity, and grain orientation of CsPbIBr2 for enhanced photovoltaic performance.
- To achieve higher open-circuit voltage (Voc) and power conversion efficiency (PCE) in carbon-based, all-inorganic CsPbIBr2 solar cells.
Main Methods:
- A novel light-processing technology involving exposure to simulated AM 1.5 G illumination before thermal annealing was employed.
- CsPbIBr2 precursor films were fabricated using a conventional one-step spin-coating method.
- Characterization of film properties including coverage, phase purity, grain size, crystallinity, and crystallographic orientation ([100] preferential orientation).
Main Results:
- The light-processing technology enabled the formation of full-coverage, pure-phase CsPbIBr2 films with large grains and high crystallinity.
- A preferential [100] grain orientation and favorable electronic structure were achieved.
- The optimized carbon-based, all-inorganic planar cells demonstrated a power conversion efficiency (PCE) of 8.60% and an open-circuit voltage (Voc) of 1.283 V.
- The achieved Voc is the highest reported for CsPbIBr2 solar cells, leading to superior PCE.
Conclusions:
- The developed light-processing technology effectively overcomes energy loss issues in CsPbIBr2 solar cells.
- This method significantly enhances the performance of carbon-based, all-inorganic solar cells by improving film quality and electronic properties.
- The findings suggest a promising new route for improving the efficiency of low-cost, stable, and easily fabricated CsPbIBr2 solar cells.
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