skip to main content

Title: Origin of the high performance of perovskite solar cells with large grains

Due to excellent carrier transport characteristics, CH{sub 3}NH{sub 3}PbI{sub 3} film made of large single crystal grains is considered as a key to improve upon already remarkable perovskite solar cell (PSC) efficiency. We have used a simple and efficient solvent vapor annealing method to obtain CH{sub 3}NH{sub 3}PbI{sub 3} films with grain size over 1 μm. PSCs with different grain size films have been fabricated and verified the potential of large grains for improving solar cells performance. Moreover, the larger grain films have shown stronger light absorption ability and more photon-generated carriers under the same illumination. A detailed temperature-dependent PL study has indicated that it originates from larger radius and lower binding energy of donor-acceptor-pair (DAP) in larger grains, which makes the DAP is easily to be separated and difficult to be recombine.
Authors:
; ; ; ; ;  [1]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22489417
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ANNEALING; BINDING ENERGY; CARRIERS; FILMS; GRAIN SIZE; MONOCRYSTALS; PERFORMANCE; PEROVSKITE; PHOTONS; SOLAR CELLS; TEMPERATURE DEPENDENCE; VAPORS; VISIBLE RADIATION