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Title: Atomic Layer Deposition of Vanadium Oxide to Reduce Parasitic Absorption and Improve Stability in n-i-p Perovskite Solar Cells for Tandems

Abstract

Two critical issues associated with semi-transparent, n-i-p perovskite solar cells for 2-terminal tandem devices are parasitic absorption and long-term instability associated with the widely used spiro-OMeTAD and MoOx hole transport and buffer layers, respectively. In this work, we present an alternative hole contact bilayer that consists of a 30 nm undoped layer of spiro-TTB in conjunction with 9 nm of air-stable vanadium oxide (VOx) deposited via atomic layer deposition. The low absorption of UV and visible light in this bilayer results in the fabrication of a semi-transparent perovskite cell with 18.9 mA cm-2 of photocurrent, a 14% increase compared to the 16.6 mA cm-2 generated in a control device with 150 nm of doped spiro-OMeTAD. The ALD VOx buffer layer shows promise as a stable alternative to MoOx; an unencapsulated Cs0.17FA0.83Pb(Br0.17I0.83)3 device with ALD VOx and ITO as the top contact maintains its efficiency following 1000 hours at 85 degrees C in a N2 environment. Lastly, we use transfer matrix modeling of the optimized perovskite stack to predict its optical performance in a monolithic tandem cell with heterojunction silicon.

Authors:
 [1];  [2];  [1];  [3];  [3];  [4];  [1]
  1. Stanford University
  2. Wellesley College;Stanford University
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  4. University of Colorado
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S), PVRD2 Program
OSTI Identifier:
1542763
Report Number(s):
NREL/JA-5900-74306
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Sustainable Energy & Fuels
Additional Journal Information:
Journal Volume: 3; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; hole transports; optical performance; semi-transparent; transfer matrix model; vanadium oxides; atomic layer deposition

Citation Formats

Raiford, James A., Belisle, Rebecca A., Bush, Kevin A., Prasanna, Rohit, Palmstrom, Axel, McGehee, Michael D., and Bent, Stacey F. Atomic Layer Deposition of Vanadium Oxide to Reduce Parasitic Absorption and Improve Stability in n-i-p Perovskite Solar Cells for Tandems. United States: N. p., 2019. Web. doi:https://dx.doi.org/10.1039/C9SE00081J.
Raiford, James A., Belisle, Rebecca A., Bush, Kevin A., Prasanna, Rohit, Palmstrom, Axel, McGehee, Michael D., & Bent, Stacey F. Atomic Layer Deposition of Vanadium Oxide to Reduce Parasitic Absorption and Improve Stability in n-i-p Perovskite Solar Cells for Tandems. United States. doi:https://dx.doi.org/10.1039/C9SE00081J.
Raiford, James A., Belisle, Rebecca A., Bush, Kevin A., Prasanna, Rohit, Palmstrom, Axel, McGehee, Michael D., and Bent, Stacey F. Fri . "Atomic Layer Deposition of Vanadium Oxide to Reduce Parasitic Absorption and Improve Stability in n-i-p Perovskite Solar Cells for Tandems". United States. doi:https://dx.doi.org/10.1039/C9SE00081J.
@article{osti_1542763,
title = {Atomic Layer Deposition of Vanadium Oxide to Reduce Parasitic Absorption and Improve Stability in n-i-p Perovskite Solar Cells for Tandems},
author = {Raiford, James A. and Belisle, Rebecca A. and Bush, Kevin A. and Prasanna, Rohit and Palmstrom, Axel and McGehee, Michael D. and Bent, Stacey F.},
abstractNote = {Two critical issues associated with semi-transparent, n-i-p perovskite solar cells for 2-terminal tandem devices are parasitic absorption and long-term instability associated with the widely used spiro-OMeTAD and MoOx hole transport and buffer layers, respectively. In this work, we present an alternative hole contact bilayer that consists of a 30 nm undoped layer of spiro-TTB in conjunction with 9 nm of air-stable vanadium oxide (VOx) deposited via atomic layer deposition. The low absorption of UV and visible light in this bilayer results in the fabrication of a semi-transparent perovskite cell with 18.9 mA cm-2 of photocurrent, a 14% increase compared to the 16.6 mA cm-2 generated in a control device with 150 nm of doped spiro-OMeTAD. The ALD VOx buffer layer shows promise as a stable alternative to MoOx; an unencapsulated Cs0.17FA0.83Pb(Br0.17I0.83)3 device with ALD VOx and ITO as the top contact maintains its efficiency following 1000 hours at 85 degrees C in a N2 environment. Lastly, we use transfer matrix modeling of the optimized perovskite stack to predict its optical performance in a monolithic tandem cell with heterojunction silicon.},
doi = {https://dx.doi.org/10.1039/C9SE00081J},
journal = {Sustainable Energy & Fuels},
number = 6,
volume = 3,
place = {United States},
year = {2019},
month = {4}
}

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