skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on April 6, 2019

Title: Light-induced lattice expansion leads to high-efficiency perovskite solar cells

Here, hybrid-perovskite based high-performance optoelectronic devices and clues from their operation has led to the realization that light-induced structural dynamics play a vital role on their physical properties, device performance and stability. Here, we report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin-films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in-situ structural and device characterizations reveal that light-induced lattice expansion significantly benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5% to 20.5%. This is a direct consequence of the relaxation of local lattice strains during lattice expansion, which results in the reduction of the energetic barriers at the perovskite/contact interfaces in devices, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion stabilizes these high-efficiency photovoltaic devices under continuous operation of full-spectrum 1-Sun illumination for over 1500 hours. One Sentence Summary: Light-induced lattice expansion improves crystallinity, relaxes lattice strain, which enhances photovoltaic performance in hybrid perovskite device.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ; ORCiD logo [5] ; ORCiD logo [6] ; ORCiD logo [7] ; ORCiD logo [7] ; ORCiD logo [7] ; ORCiD logo [3] ; ORCiD logo [5] ;  [2] ; ORCiD logo [4] ; ORCiD logo [3] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rice Univ., Houston, TX (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Northwestern Univ., Evanston, IL (United States)
  5. Univ. de Rennes, Rennes (France)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Rice Univ., Houston, TX (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 360; Journal Issue: 6384; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY
OSTI Identifier:
1433058