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Color-Tunable and Efficient CsPbBr3 Photovoltaics Enabled by a Triple-Functional P3HT Modification
Yanan Zhang1, Zhizhe Wang2, Dazheng Chen1,3
1State Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology, Faculty of Integrated Circuit, Xidian University, Xi'an 710071, China.
Materials (Basel, Switzerland)
|October 16, 2025
Summary
Poly(3-Hexylthiophene) (P3HT) enhances CsPbBr3 perovskite solar cells (PSCs) by improving light absorption and charge transport. This triple-functional modifier boosts efficiency and enables color-tunable, semi-transparent devices for building applications.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- All inorganic CsPbBr3 perovskites offer excellent stability but suffer from wide bandgaps and poor film quality, limiting perovskite solar cell (PSC) performance.
- Enhancing light absorption and charge transport is crucial for advancing CsPbBr3 PSC efficiency and expanding their applications.
Purpose of the Study:
- To introduce a triple-functional poly(3-Hexylthiophene) (P3HT) modifier for color-tunable, semi-transparent CsPbBr3 PSCs.
- To investigate P3HT's role in improving optical properties, energy level alignment, and defect passivation in CsPbBr3 films.
Main Methods:
- Incorporation of P3HT as an assistant photoactive layer and hole transport layer modifier.
- Tuning P3HT concentration to observe effects on CsPbBr3 film color and device performance.
- Characterization of photovoltaic parameters, including power conversion efficiency (PCE), open-circuit voltage (VOC), and short-circuit current (JSC).
Main Results:
- P3HT enhanced light absorption and broadened spectral response, acting as an assistant photoactive layer.
- P3HT improved hole transport by optimizing the CsPbBr3/anode interface energy levels.
- The optimal P3HT concentration (10 mg/mL) yielded a champion PCE of 8.71%, significantly outperforming control devices (6.86%).
- Devices exhibited color tunability from light yellow to reddish brown with increasing P3HT concentration.
- The CsPbBr3/P3HT heterostructure demonstrated improved stability and repeatability.
Conclusions:
- The triple-functional P3HT modifier effectively enhances CsPbBr3 PSC performance through optical and electronic improvements.
- P3HT facilitates defect passivation by forming stable Pb-S bonds, further boosting device efficiency.
- The developed CsPbBr3/P3HT heterostructures show promise for semi-transparent applications, particularly in building-integrated photovoltaics (BIPVs).
