Modulation of perovskite crystallization processes towards highly efficient and stable perovskite solar cells with MXene quantum dot-modified SnO2. Issue 6 (4th May 2021)

• Record Type: Journal Article
• Authors: Yang, Yingguo; Lu, Haizhou; Feng, Shanglei; Yang, Lifeng; Dong, Hua; Wang, Jiaou; Tian, Chen; Li, Lina; Lu, Hongliang; Jeong, Jaeki; Zakeeruddin, Shaik M.; Liu, Yuhang; Grätzel, Michael; Hagfeldt, Anders
• Is Part Of: Energy & environmental science. Volume 14:Issue 6(2021)
• Page Start: 3447
• Page End: 3454
• Publication Date: 2021-05-04
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/d1ee00056j
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : MQDs-SnO2 -modulated perovskite crystallization processes visualized by in situ 2D GIXRD technique. Abstract : Nanocrystalline tin (iv ) oxide (SnO2 ) electron-transport layers (ETL) have shown great potential for achieving highly efficient, stable perovskite solar cells (PSCs), in particular low-temperature-processed flexible PSCs. Recently, studies have further shown that a modified SnO2 bottom layer facilitates the deposition of highly crystalline perovskite films, boosting the photovoltaic performance of the PSCs. The modulation of perovskite crystallization processes is a key to obtain highly crystalline and stable perovskite films; however, a fundamental understanding is still missing. Herein, we report an in situ synchrotron-based two-dimensional grazing-incidence X-ray diffraction technique to explore the SnO2 ETL-modulated perovskite crystallization kinetics for the first time. The titanium carbide (Ti3 C2 T x )-MXene quantum dot-modified SnO2 (MQDs-SnO2 ) ETL was found to be able to rapidly induce perovskite nucleation from the precursor solution, forming an intermediate perovskite phase upon anti-solvent treatment. This substantially improves the crystal quality and phase stability of the as-fabricated perovskite film. Benefiting in addition from the superior charge extraction properties of the MQDs-SnO2 layer, a steady-state power conversion efficiency of up to 23.3%, as well as outstanding stability against humidity and light soaking was achieved for the corresponding PSCs.