通过多功能界面工程实现效率超过19%的稳定层状二维钙钛矿太阳能电池。
Stable Layered 2D Perovskite Solar Cells with an Efficiency of over 19% via Multifunctional Interfacial Engineering.
作者信息
Huang Yawen, Li Yahong, Lim Eng Liang, Kong Tengfei, Zhang Yang, Song Jing, Hagfeldt Anders, Bi Dongqin
机构信息
State key laboratory of optoelectronic materials and technology, Guangdong Provincial Key Laboratory of low carbon chemistry and process energy conservation, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
Laboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
出版信息
J Am Chem Soc. 2021 Mar 17;143(10):3911-3917. doi: 10.1021/jacs.0c13087. Epub 2021 Mar 4.
Layered 2D perovskites have been extensively investigated by scientists with photovoltaics (PV) expertise due to their good environmental stability. However, a random phase distribution in the perovskite film could affect both the performance and stability of the devices. To overcome this problem, we propose multifunctional interface engineering of 2D GAMAPbI perovskite by employing guanidinium bromide (GABr) on top of it to optimize the secondary crystallization process. It is found that GABr treatment can facilitate to form a shiny and smooth surface of the 2D GAMAPbI film with excellent optoelectronic properties. Thus, we realize efficient and stable 2D perovskite solar cells (PSCs) with a champion power conversion efficiency (PCE) of 19.3% under AM 1.5G illumination. Additionally, the optimized device without encapsulation could retain 94% of the initial PCE for more than 3000 h after being stored under ambient conditions.
由于其良好的环境稳定性，层状二维钙钛矿受到了具有光伏（PV）专业知识的科学家们的广泛研究。然而，钙钛矿薄膜中的随机相分布可能会影响器件的性能和稳定性。为了克服这个问题，我们提出了对二维GAMAPbI钙钛矿进行多功能界面工程，即在其顶部使用溴化胍（GABr）来优化二次结晶过程。研究发现，GABr处理有助于形成具有优异光电性能的二维GAMAPbI薄膜的光亮光滑表面。因此，我们实现了高效稳定的二维钙钛矿太阳能电池（PSC），在AM 1.5G光照下的冠军功率转换效率（PCE）为19.3%。此外，优化后的未封装器件在环境条件下储存3000多小时后，仍可保留初始PCE的94%。
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