Modulated growth of high-quality CsPbI3 perovskite film using a molybdenum modified SnO2 layer for highly efficient solar cells. Issue 45 (10th November 2021)

• Record Type: Journal Article
• Authors: Gong, Xiu; Wang, Ting; Yin, Guilin; Peng, Qiong; Chen, Yanli; Wang, Xu; Qi, Xiaosi; Jiang, Yurong; Liu, Zonghao; Shen, Yan; Wang, Mingkui
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 45(2021)
• Page Start: 25567
• Page End: 25575
• Publication Date: 2021-11-10
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta07617e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : High-quality β-CsPbI3 film was grown using an efficient electron transport layer of low temperature Mo-doped SnO2 nanocrystals. This work provides a simple strategy to simultaneously modulate CsPbI3 perovskite growth and the interfaces in devices. Abstract : The electron transport layer (ETL) plays a critical role in charge extraction and perovskite thin film growth in planar n–i–p heterojunction perovskite solar cells. Herein, we modulated the nucleation and growth rate of CsPbI3 crystals by using a Mo doping strategy to synthesize high-quality SnO2 crystals as an ETL nano-film in n–i–p heterojunction perovskite solar cells. We revealed that such a nano-film with low surface energy and high roughness induced by Mo doping provides seed-like nucleation sites for CsPbI3 inorganic perovskite growth, leading to improved perovskite film morphology. The charge extraction at the ETL/perovskite interface is also enhanced due to the improved energy level alignment. As a result, a high power conversion efficiency of 17.41% can be achieved under one sun irradiation for a planar n–i–p heterojunction structured CsPbI3 solar cell by using this novel Mo–SnO2 ETL. This work provides a simple pathway to simultaneously modulate CsPbI3 inorganic perovskite crystallization and interfacial charge extraction in planar heterojunction perovskite devices.