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Exciton-Photon Critical Coupling in Size-Tailored Quantum Dots Enables >22% Efficient and Stable Inverted CsPbI3
Dongfang Xu1, Kaixiang Cui2, Zihao Fan1
1Key Laboratory of Applied Surface and Colloid Chemistry, Shaanxi Key Laboratory for Advanced Energy Devices, Ministry of Education, Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, China.
Interface engineering with CsPbBr3 quantum dots in mesoporous silica nanoparticles significantly boosts all-inorganic perovskite solar cell (PSC) performance and stability. This strategy overcomes recombination and defects, achieving record efficiency and longevity.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- All-inorganic CsPbI3 perovskite solar cells (PSCs) face challenges with nonradiative recombination and interfacial defects, hindering efficiency and stability.
- Effective interface engineering is crucial for advancing PSC technology.
Purpose of the Study:
- To develop an interface engineering strategy for all-inorganic CsPbI3 PSCs.
- To improve device efficiency, stability, and charge transport through optimized heterojunctions.
Main Methods:
- Fabrication of a CsPbI3/CPBQDs@MSNs heterojunction using CsPbBr3 quantum dots (CPBQDs) within mesoporous silica nanoparticles (MSNs).
- Tuning MSN pore size for optimal exciton-photon critical coupling between CPBQDs and CsPbI3.
- Characterization of the heterojunction's impact on crystallinity, defects, and energy level alignment.
Main Results:
- Achieved a record power conversion efficiency (PCE) of 22.15% and an open-circuit voltage (VOC) of 1.28 V for inverted CsPbI3 PSCs.
- Demonstrated superior fluorescence stability over a wide temperature range due to suppressed nonradiative recombination.
- Devices retained 93.16% of initial PCE after 1300 hours in ambient air and 98.14% after 1000 hours of illumination.
Conclusions:
- Size-controlled quantum dots are vital for interfacial engineering in perovskite optoelectronics.
- The developed CPBQDs@MSNs strategy offers a promising pathway for high-performance and stable perovskite solar cells.
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