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Title: Correlation of energy disorder and open-circuit voltage in hybrid perovskite solar cells

Organometal trihalide perovskites have been demonstrated as excellent light absorbers for high efficiency photovoltaic applications. Previous approaches to increasing the solar cell efficiency have focussed on optimisation of the grain morphology of perovskite thin films. Here, we show that the structural order of the electron-transport layers also has a significant impact on solar cell performance. We demonstrate that the power conversion efficiency of CH 3NH 3PbI 3 planar-heterojunction photovoltaic cells increases from 17.1% to 19.4% when the energy disorder in the fullerene electron-transport layer is reduced by a simple solvent annealing process. The increase in efficiency is the result of the enhancement in open-circuit voltage from 1.04 V to 1.13 V without sacrificing the short-circuit current and fill factor. Finally, these results shed light on the origin of open-circuit voltage in perovskite solar cells, and provide a new path to further increase their efficiency
 [1] ;  [1] ;  [1]
  1. Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Energy
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2058-7546
Nature Publishing Group
Research Org:
Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
Country of Publication:
United States
14 SOLAR ENERGY; electronic properties and materials; electronics, photonics and device physics; solar cells
OSTI Identifier: