Examining the Interfacial Defect Passivation with Chlorinated Organic Salt for Highly Efficient and Stable Perovskite Solar Cells. Issue 11 (6th September 2020)

• Record Type: Journal Article
• Authors: Azam, Muhammad; Khan, Abbas Ahmad; Liang, Guang-Xing; Li, Gui-Jun; Chen, Shuo; Zheng, Zhuang-Hao; Farooq, Umar; Ishaq, Muhammad; Fan, Ping; Wang, Zhijie; Wang, Zhan-Guo
• Is Part Of: Solar RRL. Volume 4:Issue 11(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-06
• Subjects: crystallization -- hysteresis -- interface -- passivation -- stability; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202000358
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : In perovskite solar cells (PSCs), the interfaces between perovskite film and charge transport layers have an enormous influence on the device performance and stability. Recently, it has been proven that the surface defect passivation of perovskite layer is an effective strategy to improve the device efficiency. Herein, an organic ammonium salt benzyltriethylammonium chloride ([BZTAm]Cl) is used as an ultra‐thin modification layer in perovskite films in MAPbI3 PSCs for passivating the surface defects. The obtained results demonstrate that the [BZTAm]Cl modifier improves the crystallization/morphology of perovskite film and effectively aligns the energy levels with the corresponding charge‐transporting layers, suppressing the nonradiative recombination and reducing the trap state density. As a result, a champion device efficiency of 20.45% is achieved for optimized concentration of [BZTAm]Cl in comparison with 17.87% for the control device. Moreover, the unencapsulated device presents a good long‐term stability after aging in an ambient environment with 40–50% relative humidity conditions for 30 days. Abstract : The optimized ratio of chlorinated organic salt benzyltriethylammonium chloride ([BZTAm]Cl) is helpful for the interfacial defect passivation at the perovskite/PC61 BM interface. The corresponding perovskite film treatment produces high‐quality film, suppresses nonradiative recombination, and promotes the energy levels matching, which results in remarkably improved device performance and environmental stability.