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Published on: February 27, 2017
Interface Passivation with Codeposition Strategy toward High-Efficiency and Stable Perovskite Solar Cells
Dezhao Zhang1,2, Li He1,2, Haotian Zhang1,2
1Institute of Solar Energy, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Researchers developed a new interface passivation strategy for perovskite solar cells (PSCs) using (4-bromophenyl) phosphonic acid. This method enhances perovskite morphology and device efficiency, leading to a 24.9% power conversion efficiency and improved stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Interface engineering is crucial for high-performance perovskite solar cells (PSCs).
- Poor contact between perovskite and electron transport layers limits carrier dynamics and device efficiency in n-i-p type PSCs.
Purpose of the Study:
- To introduce a novel codeposition strategy for interface passivation in PSCs.
- To improve perovskite morphology and carrier dynamics at the buried interface.
- To enhance the power conversion efficiency and stability of PSCs.
Main Methods:
- A codeposition strategy using (4-bromophenyl) phosphonic acid was employed.
- The phosphonic acid derivative acts as a bridging molecule between the tin dioxide and perovskite layers.
- Defect passivation of tin dioxide and perovskite films was achieved through molecular functional groups.
Main Results:
- Achieved a power conversion efficiency of 24.9% in PSCs.
- Demonstrated improved perovskite morphology and effective passivation of interface defects.
- PSCs retained 81% of initial efficiency after 300 hours of stability testing under ISOS-L-1 conditions.
Conclusions:
- The novel codeposition strategy effectively passivates interfaces and enhances PSC performance.
- This approach offers insights for developing low-cost, efficient, and stable PSCs.
- Interface passivation is key to overcoming limitations in perovskite solar cell technology.
