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Crystallization Modulation and Holistic Passivation Enables Efficient Two-Terminal Perovskite/CuIn(Ga)Se2 Tandem
Cong Geng1, Kuanxiang Zhang2, Changhua Wang2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, People's Republic of China.
Nano-Micro Letters
|September 21, 2024
Summary
Researchers improved perovskite/CIGS tandem solar cells using novel passivation methods. This resulted in a record 24.6% power conversion efficiency for two-terminal devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Two-terminal perovskite (PVK)/CuIn(Ga)Se2 (CIGS) tandem solar cells offer ideal bandgap matching for high efficiency.
- Commercial CIGS surface roughness hinders perovskite layer coverage and device performance.
Purpose of the Study:
- To enhance the performance of two-terminal PVK/CIGS tandem solar cells.
- To address challenges related to CIGS surface morphology and interface recombination.
Main Methods:
- Utilized D-homoserine lactone hydrochloride to improve PVK coverage and passivate bulk defects.
- Employed surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide to passivate surface and grain boundary defects.
- Incorporated LiF to create a field effect for reducing interface recombination.
Main Results:
- Achieved a power conversion efficiency of 24.6% for a 0.16 cm2 two-terminal PVK/CIGS tandem solar cell.
- Demonstrated improved PVK coverage on rough CIGS surfaces.
- Successfully reduced interface recombination through defect passivation and field effect.
Conclusions:
- The developed methods significantly enhance the performance of PVK/CIGS tandem solar cells.
- This approach shows great potential for achieving superior efficiencies in tandem photovoltaic devices.
