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Perovskite/Organic Tandem Solar Cells with 26.49% Efficiency via Enhanced Absorption and Minimized Energy Losses
Bing Guo1, Jiaqi Li1, Ruihan Wu2
1State Key Laboratory and Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, People's Republic of China.
Researchers improved perovskite/organic tandem solar cell efficiency by optimizing the rear organic subcell morphology using isopropanol. This led to a certified power conversion efficiency of 25.56%.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite/organic tandem solar cells show promise but lag behind perovskite/perovskite cells in power conversion efficiency (PCE).
- Low external quantum efficiency and high energy loss in the rear subcell limit current perovskite/organic tandem device performance.
Purpose of the Study:
- To enhance the photovoltaic performance of perovskite/organic tandem solar cells.
- To identify optimal material combinations and improve the rear organic subcell.
Main Methods:
- Semi-empirical analysis to select suitable materials.
- Utilizing isopropanol as a co-solvent additive to tune the bulk heterojunction morphology of the organic active layer.
- Optimization of individual subcells within the tandem structure.
Main Results:
- Achieved a remarkable power conversion efficiency (PCE) of 26.49% (certified 25.56%) for the perovskite/organic tandem device.
- Attained a high open-circuit voltage of 2.214 V.
- Demonstrated effective morphology tuning of the organic rear subcell using isopropanol.
Conclusions:
- Optimizing the rear organic subcell morphology is crucial for improving perovskite/organic tandem solar cell performance.
- Isopropanol serves as an effective additive for enhancing bulk heterojunction morphology.
- The developed device represents a significant advancement in perovskite/organic tandem solar cell technology.
