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Radical Molecular Modulator for High-Performance Perovskite Solar Cells
Qi Peng1, Xin Zheng1, Xiaoru Zhang1
1Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.
Frontiers in Chemistry
|October 7, 2020
Summary
Radical molecular modulation using O-donor groups enhances perovskite solar cell (PSC) performance. This technique passivates defects and improves film quality, leading to higher efficiency and stability in PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) face commercialization challenges due to long-term stability issues.
- Defects at grain boundaries in perovskite films degrade optoelectronic performance and device stability under various environmental stressors.
- O-donor Lewis bases are commonly used to enhance PSC performance.
Purpose of the Study:
- To develop a radical molecular modulation strategy using O-donor groups for high-performance perovskite photovoltaic devices.
- To investigate the effect of radical modulators on perovskite film quality and device stability.
- To improve the power conversion efficiency and operational lifespan of PSCs.
Main Methods:
- Designed and synthesized radical modulators based on the O-donor group, specifically 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO).
- Applied TEMPO to perovskite grain boundaries to passivate surface defects and template crystal growth.
- Fabricated and characterized TEMPO-modulated PSCs to evaluate their optoelectronic properties and stability.
Main Results:
- TEMPO effectively passivated surface defects in perovskite films.
- Radical modulation templated the formation of large grain crystals and high-quality perovskite thin films.
- Optimized TEMPO-modulated PSCs achieved a power conversion efficiency of 20.73% with enhanced stability.
Conclusions:
- Radical molecular modulation is a promising strategy for improving PSC performance and stability.
- TEMPO acts as an effective radical modulator, passivating defects and enhancing film quality.
- This work contributes to understanding the role of radicals in advancing perovskite optoelectronics.
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