Photo-response of Two-Dimensional Ruddlesden-Popper Perovskite Films for Photovoltaics

• Published in: E3S web of conferences Vol. 257; p. 3020
• Main Authors: Wu, Gao, Cai, Molang, Dai, Songyuan
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 01.01.2021
• Subjects: Carrier transport; Current carriers; Light effects; Morphology; Perovskites; Photovoltaic cells; Photovoltaics; Scanning; Solar cells; White light; Xenon
• ISSN: 2267-1242; 2555-0403; 2267-1242
• DOI: 10.1051/e3sconf/202125703020

Two-dimensional (2D) Ruddlesden-Popper (RP) perovskites have emerged as a prospective candidate to address the instability issues of traditional perovskite solar cells. However, the mechanisms of charge carrier transport of 2D perovskite films obtained by the solution process still remain elusive. In this work, we proposed a novel characterization technique based on the Kelvin probe force microscopy (KPFM) to investigate the micro-scale morphology and surface potential (SP) of the BA 2 MA 3 Pb 4 I 13 films. In additionally, a Xenon laser source was adopted to realize the in-situ scanning of the light response of the perovskite film. The obvious increase in surface potential values in the same scanning area before and after white light illumination indicated the emergence of photo-generated charge carriers. Based on the unique photophysical properties and form formation features of the hot-cast BA 2 MA 3 Pb 4 I 13 films, we fabricated the 2D perovskite solar cells (PSCs) with an efficiency of 10.95%. As a result, the in-situ KPFM is capable to serve as an effective approach to investigating the charge carrier behaviors in the 2D perovskites for photovoltaic applications.