The Effect of Decomposed PbI2 on Microscopic Mechanisms of Scattering in CH3NH3PbI3 Films

Dan Shan; Guoqing Tong; Yunqing Cao; Mingjun Tang; Jun Xu; Linwei Yu; Kunji Chen

doi:10.1186/s11671-019-3022-y

Nanoscale Research Letters (Jun 2019)

The Effect of Decomposed PbI2 on Microscopic Mechanisms of Scattering in CH3NH3PbI3 Films

Dan Shan,
Guoqing Tong,
Yunqing Cao,
Mingjun Tang,
Jun Xu,
Linwei Yu,
Kunji Chen

Affiliations

Dan Shan: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Guoqing Tong: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Yunqing Cao: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Mingjun Tang: School of Electronic and Information Engineering, Yangzhou Polytechnic Institute
Jun Xu: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Linwei Yu: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Kunji Chen: National Laboratory of Solid State Microstructures and School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University

DOI: https://doi.org/10.1186/s11671-019-3022-y
Journal volume & issue: Vol. 14, no. 1
pp. 1 – 6

Abstract

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Abstract Hybrid organic-inorganic perovskites (HOIPs) exhibit long electronic carrier diffusion length, high optical absorption coefficient, and impressive photovoltaic device performance. At the core of any optoelectronic device lie the charge transport properties, especially the microscopic mechanism of scattering, which must efficiently affect the device function. In this work, CH3NH3PbI3 (MAPbI3) films were fabricated by a vapor solution reaction method. Temperature-dependent Hall measurements were introduced to investigate the scattering mechanism in MAPbI3 films. Two kinds of temperature-mobility behaviors were identified in different thermal treatment MAPbI3 films, indicating different scattering mechanisms during the charge transport process in films. We found that the scattering mechanisms in MAPbI3 films were mainly influenced by the decomposed PbI2 components, which could be easily generated at the perovskite grain boundaries (GBs) by releasing the organic species after annealing at a proper temperature. The passivation effects of PbI2 in MAPbI3 films were investigated and further discussed with emphasis on the scattering mechanism in the charge transport process.

Published in Nanoscale Research Letters

ISSN: 1931-7573 (Print); 1556-276X (Online)
Publisher: SpringerOpen
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.springer.com/journal/11671

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