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Title: Electron-hole diffusion lengths > 175  m in solution-grown CH3NH3PbI3 single crystals

Abstract

Long, balanced electron and hole diffusion lengths greater than 100 nanometers in the polycrystalline organolead trihalide compound CH3NH3PbI3 are critical for highly efficient perovskite solar cells. We found that the diffusion lengths in CH3NH3PbI3 single crystals grown by a solution-growth method can exceed 175 micrometers under 1 sun (100 mW cm–2) illumination and exceed 3 millimeters under weak light for both electrons and holes. The internal quantum efficiencies approach 100% in 3-millimeter-thick single-crystal perovskite solar cells under weak light. These long diffusion lengths result from greater carrier mobility, longer lifetime, and much smaller trap densities in the single crystals than in polycrystalline thin films. As a result, the long carrier diffusion lengths enabled the use of CH3NH3PbI3 in radiation sensing and energy harvesting through the gammavoltaic effect, with an efficiency of 3.9% measured with an intense cesium-137 source.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1353300
Alternate Identifier(s):
OSTI ID: 1238001
Grant/Contract Number:  
EE0006709
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 347 Journal Issue: 6225; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE

Citation Formats

Dong, Q., Fang, Y., Shao, Y., Mulligan, P., Qiu, J., Cao, L., and Huang, J. Electron-hole diffusion lengths > 175  m in solution-grown CH3NH3PbI3 single crystals. United States: N. p., 2015. Web. doi:10.1126/science.aaa5760.
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Dong, Q., Fang, Y., Shao, Y., Mulligan, P., Qiu, J., Cao, L., & Huang, J. Electron-hole diffusion lengths > 175  m in solution-grown CH3NH3PbI3 single crystals. United States. https://doi.org/10.1126/science.aaa5760
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Dong, Q., Fang, Y., Shao, Y., Mulligan, P., Qiu, J., Cao, L., and Huang, J. Thu . "Electron-hole diffusion lengths > 175  m in solution-grown CH3NH3PbI3 single crystals". United States. https://doi.org/10.1126/science.aaa5760.
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@article{osti_1353300,
title = {Electron-hole diffusion lengths > 175  m in solution-grown CH3NH3PbI3 single crystals},
author = {Dong, Q. and Fang, Y. and Shao, Y. and Mulligan, P. and Qiu, J. and Cao, L. and Huang, J.},
abstractNote = {Long, balanced electron and hole diffusion lengths greater than 100 nanometers in the polycrystalline organolead trihalide compound CH3NH3PbI3 are critical for highly efficient perovskite solar cells. We found that the diffusion lengths in CH3NH3PbI3 single crystals grown by a solution-growth method can exceed 175 micrometers under 1 sun (100 mW cm–2) illumination and exceed 3 millimeters under weak light for both electrons and holes. The internal quantum efficiencies approach 100% in 3-millimeter-thick single-crystal perovskite solar cells under weak light. These long diffusion lengths result from greater carrier mobility, longer lifetime, and much smaller trap densities in the single crystals than in polycrystalline thin films. As a result, the long carrier diffusion lengths enabled the use of CH3NH3PbI3 in radiation sensing and energy harvesting through the gammavoltaic effect, with an efficiency of 3.9% measured with an intense cesium-137 source.},
doi = {10.1126/science.aaa5760},
journal = {Science},
number = 6225,
volume = 347,
place = {United States},
year = {Thu Jan 29 00:00:00 EST 2015},
month = {Thu Jan 29 00:00:00 EST 2015}
}
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https://doi.org/10.1126/science.aaa5760
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