Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202103491
Keywords
anchoring; capping; ionic-liquids; perovskites; solar cells
Categories
Funding
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA17040506]
- National Natural Science Foundation of China [62104137, 62174103]
- China National Postdoctoral Program for Innovative Talents [BX2021173]
- China Postdoctoral Science Foundation [2021M702058]
- National Key Research and Development Program of China [2017YFA0204800]
- Young Talent fund of University Association for Science and Technology in Shaanxi, China [20210102]
- DNL Cooperation Fund CAS [DNL180311]
- 111 Project [B21005]
- Changjiang Scholar and Innovative Research Team [IRT_14R33]
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A new approach using an ionic liquid was designed to improve the stability and performance of metal-halide perovskite solar cells. Experimental results showed that this method effectively enhances the photovoltaic performance while exhibiting outstanding stability characteristics.
Metal-halide perovskite has emerged as an effective photovoltaic material for its high power conversion efficiency (PCE), low cost and straightforward fabrication techniques. Unfortunately, its long-term operational durability, mainly affected by halide ion migration and undercoordinated Pb2+ is still the bottleneck for its large-scale commercialization. In this work, an ionic liquid (IL) is designed to effectively cap the grain surface for improved stability and reduced trap density. More specifically, the Br- in the IL passivates the undercoordinated Pb2+ by chemically bonding to it, resulting in a thin layer of ionic-liquid-perovskite formed on the surface, leading to improved photovoltaic performance and better stability. Specifically, the solar cell exhibits an open-circuit voltage of 1.192 V and PCE of 24.33% under one-sun illumination with negligible hysteresis, and a large area (10.75 cm(2)) integrated module achieves PCE of 20.33%. Moreover, the bare device maintains over 90% of its initial efficiency after 700 h of aging at 65 degrees C. It also shows outstanding stability with only about 10% degradation after being exposed to the ambient environment for 1000 h. The superior efficiency and stability demonstrate that the present IL passivating strategy is a promising approach for high-performance large area perovskite solar cell applications.
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