Fabrication of pyramidal (111) MAPbBr3 film with low surface defect density using homogeneous quantum-dot seeds. Issue 3 (20th December 2019)

• Record Type: Journal Article
• Authors: Jeong, Hyeon Jun; Bang, Seungho; Park, Dae Young; Jeon, Hobeom; Namkoong, Gon; Jeong, Mun Seok
• Is Part Of: Nanoscale. Volume 12:Issue 3(2020)
• Page Start: 1366
• Page End: 1373
• Publication Date: 2019-12-20
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr10070a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Unique pyramidal MAPbBr3 film is formed by MAPbBr3 seeds. The pyramidal MAPbBr3 film effectively reduces surface defects, eliminating hysteresis from the photodetector. Abstract : Nucleation and seeding of organometal halide perovskite (OHP) films have been extensively investigated for forming high-density, large-crystalline, and low-defect films. In this study, CH3 NH3 PbBr3 (MAPbBr3 ) films with a low defect density are synthesized via a molecular exchange mechanism using MAPbBr3 quantum dots as seeds. The synthesized films exhibit a pyramidal morphology with a (111) crystal plane. The distribution of the (111) plane is controlled by adjusting the seed concentration. The pyramidal MAPbBr3 films exhibit improved photoluminescence intensity and uniformity compared with films produced using seedless toluene. When the seeds are employed, the surface trap density is reduced by a factor of 3.5, suppressing the photocurrent hysteresis and nonsaturated response of photodetectors. Additionally, the films formed using the seeds have improved stability owing to the chain decomposition reaction induced by electron beam heating.