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In Situ Formation of Guanidinium Derivative and 2D/3D Heterostructure for 26.49% Efficient and Stable Inverted
Yifan Wang1, Rui Sun1, Yongzhe Li1
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory For Advanced Energy Devices, Shaanxi Engineering Lab For Advanced Energy Technology School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, China.
1H-1,2,4-triazole-1-ammonium chloride (HTA) enhances inverted perovskite solar cells (IPSCs) by passivating defects and improving stability. This novel additive boosts power conversion efficiency to over 26% and maintains performance in ambient air.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inverted perovskite solar cells (IPSCs) suffer from defects causing non-radiative recombination, limiting efficiency and stability.
- Defect-induced recombination is a primary obstacle for commercializing high-performance perovskite photovoltaics.
Purpose of the Study:
- To develop a multifunctional additive for simultaneous defect passivation and stability enhancement in IPSCs.
- To investigate the mechanism of a novel additive in regulating perovskite film formation and device performance.
Main Methods:
- Introduction of 1H-1,2,4-triazole-1-ammonium chloride (HTA) as an additive.
- In situ generation of a multi-amino guanidinium derivative for dual passivation (Pb2+ coordination and I- hydrogen bonding).
- Templating of 2D/3D heterostructures and regulation of nucleation kinetics.
Main Results:
- Achieved a champion power conversion efficiency (PCE) of 26.49% (certified 26.20%).
- Demonstrated remarkable stability: unencapsulated devices retained 89.15% efficiency after 2000 hours in ambient air.
- Encapsulated devices maintained 95% of initial PCE after 1000 hours of maximum power point tracking.
Conclusions:
- HTA effectively passivates defects, optimizes energy levels, and enhances stability in IPSCs.
- The in situ generated compound and 2D/3D heterostructure formation are key to improved performance.
- This strategy offers a viable pathway towards highly efficient and stable perovskite solar cells.
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