Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites
Abstract
Photoinduced halide segregation currently limits the perovskite chemistries available for use in high-bandgap semiconductors needed for tandem solar cells. Here, we study the impact of post-deposition surface modifications on photoinduced halide segregation in methylammonium lead mixed-halide perovskites. By coating a perovskite surface with the electron-donating ligand trioctylphosphine oxide (TOPO), we are able to both reduce nonradiative recombination and dramatically slow the onset of halide segregation in CH3NH3PbI2Br films. This result, coupled with the observation that the rate of halide segregation can be tuned by varying the selective contact, provides a direct link between surface modifications and photoinduced trap formation. On the basis of these observations, we discuss possible mechanisms for photoinduced halide segregation supported by drift-diffusion simulations. In conclusion, this work suggests that improved understanding and control of perovskite surfaces provides a pathway toward stable and high-performance wide-bandgap perovskites for the next generation of tandem solar cells.
- Authors:
-
- Wellesley College, Wellesley, MA (United States); Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1490990
- Grant/Contract Number:
- AC02-76SF00515; P400P2_180780; DGE-1147470; 1664669
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Energy Letters
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2380-8195
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Belisle, Rebecca A., Bush, Kevin A., Bertoluzzi, Luca, Gold-Parker, Aryeh, Toney, Michael F., and McGehee, Michael D. Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites. United States: N. p., 2018.
Web. doi:10.1021/acsenergylett.8b01562.
Belisle, Rebecca A., Bush, Kevin A., Bertoluzzi, Luca, Gold-Parker, Aryeh, Toney, Michael F., & McGehee, Michael D. Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites. United States. https://doi.org/10.1021/acsenergylett.8b01562
Belisle, Rebecca A., Bush, Kevin A., Bertoluzzi, Luca, Gold-Parker, Aryeh, Toney, Michael F., and McGehee, Michael D. Fri .
"Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites". United States. https://doi.org/10.1021/acsenergylett.8b01562. https://www.osti.gov/servlets/purl/1490990.
@article{osti_1490990,
title = {Impact of Surfaces on Photoinduced Halide Segregation in Mixed-Halide Perovskites},
author = {Belisle, Rebecca A. and Bush, Kevin A. and Bertoluzzi, Luca and Gold-Parker, Aryeh and Toney, Michael F. and McGehee, Michael D.},
abstractNote = {Photoinduced halide segregation currently limits the perovskite chemistries available for use in high-bandgap semiconductors needed for tandem solar cells. Here, we study the impact of post-deposition surface modifications on photoinduced halide segregation in methylammonium lead mixed-halide perovskites. By coating a perovskite surface with the electron-donating ligand trioctylphosphine oxide (TOPO), we are able to both reduce nonradiative recombination and dramatically slow the onset of halide segregation in CH3NH3PbI2Br films. This result, coupled with the observation that the rate of halide segregation can be tuned by varying the selective contact, provides a direct link between surface modifications and photoinduced trap formation. On the basis of these observations, we discuss possible mechanisms for photoinduced halide segregation supported by drift-diffusion simulations. In conclusion, this work suggests that improved understanding and control of perovskite surfaces provides a pathway toward stable and high-performance wide-bandgap perovskites for the next generation of tandem solar cells.},
doi = {10.1021/acsenergylett.8b01562},
journal = {ACS Energy Letters},
number = 11,
volume = 3,
place = {United States},
year = {Fri Oct 05 00:00:00 EDT 2018},
month = {Fri Oct 05 00:00:00 EDT 2018}
}
Web of Science
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