Evaluating the Optoelectronic Quality of Hybrid Perovskites by Conductive Atomic Force Microscopy with Noise Spectroscopy

• DOI: 10.1021/acsami.6b11011
• Publication Date: 2016-10-26T13:26:54Z
• Authors: Byungho Lee; Sangheon Lee; Duckhyung Cho; Jinhyun Kim; Taehyun Hwang; Kyung Hwan Kim; Seunghun Hong; Taeho Moon; Byungwoo Park
• Keywords: Photocurrent

Organic-inorganic hybrid perovskite solar cells have emerged as promising candidates for next-generation cells. To attain high photovoltaic efficiency, reducing the defects in perovskites is crucial along with a uniform coating of films. Also, evaluating quality synthesized via facile and adequate methods important well. Herein, CH3NH3PbI3 were by applying second solvent dripping to nonstoichiometric precursors containing excess CH3NH3I. The resulting films exhibited larger average grain size better crystallinity compared that from stoichiometric precursors. As result, performance planar was significantly improved, achieving an efficiency 14.3%. Furthermore, effectively analyzed using conductive AFM noise spectroscopy, which been uncommon field Comparing topography photocurrent maps, variation photocurrents nanoscale systematically investigated, linear relationship between revealed. analyses probe enabled examination defect density at specific interiors excluding grain-boundary effect, reduced clearly observed CH3NH3I-rich