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High-Efficiency, Low-Hysteresis Planar Perovskite Solar Cells by Inserting the NaBr Interlayer
Wenjing Li1,2,3, Deng Wang1,2,3, Weizhi Hou1,2,3
1Fujian Key Laboratory of Photoelectric Functional Materials, Huaqiao University, Xiamen 361021, P. R. China.
ACS Applied Materials & Interfaces
|April 27, 2021
Summary
Sodium bromide (NaBr) modification of perovskite solar cells significantly boosts efficiency to 21.16% and reduces hysteresis. This interface engineering strategy enhances charge carrier dynamics for improved device performance.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) show great research potential but face commercialization challenges due to efficiency and hysteresis defects.
- Interface modification is crucial for reducing defects and enhancing the performance of PSCs.
Purpose of the Study:
- To propose an easy and effective strategy for modifying the electron transport layer (ETL) of PSCs using sodium bromide (NaBr).
- To improve the efficiency and reduce hysteresis in PSCs through NaBr modification of the ETL.
Main Methods:
- Modification of the electron transport layer (ETL) in PSCs using sodium bromide (NaBr).
- Analysis of charge carrier dynamics and device performance before and after NaBr modification.
Main Results:
- NaBr diffusion on the ETL significantly optimizes charge carrier dynamics.
- The NaBr-coated PSC device achieved a high efficiency of 21.16%.
- Hysteresis index was reduced from 0.135 to 0.025, indicating improved stability.
Conclusions:
- NaBr modification of the ETL is a novel and effective strategy for developing high-efficiency, low-hysteresis PSCs.
- This method offers a promising pathway for the commercialization of perovskite solar technology.
