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Updated: May 28, 2025
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Defect Control and Strain Regulation Enabled High Efficiency and Stability in Flexible Perovskite Solar Cells
Dengjie Zhao1, Shiqi Li1, Chenxi Zhang1
1College of Physics and Optoelectronics Engineering, Shanxi Key Lab of Photovoltaic Technology and Application, Key Lab of Advanced Transducers and Intelligent Control System, Taiyuan University of Technology, Taiyuan 030024, China.
A new interface modification using 4-amino-2-(trifluoromethyl) benzonitrile (ATMB) significantly enhances both rigid and flexible perovskite solar cells (PSCs). This method reduces defects and strain, boosting power conversion efficiency (PCE) and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Flexible perovskite solar cells (f-PSCs) offer advantages like portability and adaptability to curved surfaces.
- Interfacial defects and tensile strain limit the performance and stability of f-PSCs.
Purpose of the Study:
- To develop a novel interface modification strategy for perovskite solar cells (PSCs) using 4-amino-2-(trifluoromethyl) benzonitrile (ATMB).
- To improve the efficiency and stability of both rigid and flexible PSCs by addressing interfacial defects and strain.
Main Methods:
- Utilized 4-amino-2-(trifluoromethyl) benzonitrile (ATMB) with amine, trifluoromethyl, and nitrile groups to modify the perovskite/Spiro-OMeTAD interface.
- Investigated the defect passivation effects, strain reduction, and electronic band structure changes induced by ATMB.
- Fabricated and characterized rigid and flexible PSCs with and without ATMB modification, including combinations with phytic acid (PA)-doped SnO2.
Main Results:
- ATMB significantly reduced defect density on perovskite surfaces and grain boundaries.
- ATMB lowered the Young's modulus of perovskite films, releasing residual stress and improving mechanical flexibility.
- ATMB modification led to an upshift in the perovskite valence band, enhancing hole extraction.
- Rigid PSCs achieved a best PCE of 22.46% and f-PSCs reached 21.42% with ATMB, compared to control devices (20.32% and 19.01%).
- Combined with PA-doped SnO2, PCEs reached 23.04% for rigid and 21.66% for flexible PSCs.
- Humidity, light stability, and mechanical flexibility were demonstrably increased.
Conclusions:
- ATMB is an effective interfacial modifier for enhancing PSC performance and stability.
- The strategy successfully mitigates key limitations in perovskite solar cell technology.
- This approach holds promise for advancing the development of high-performance flexible solar cells.
