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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

Journal Article · · Sustainable Energy & Fuels
DOI:https://doi.org/10.1039/c9se00081j· OSTI ID:1671795

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. Here 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(Br0.17 I 0.83)3 device with ALD VOx and ITO as the top contact maintains its efficiency following 1000 hours at 85 °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.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0008167; EE0008154
OSTI ID:
1671795
Alternate ID(s):
OSTI ID: 1509515
Journal Information:
Sustainable Energy & Fuels, Vol. 3, Issue 6; ISSN 2398-4902
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Cited By (3)

Enhanced Nucleation of Atomic Layer Deposited Contacts Improves Operational Stability of Perovskite Solar Cells in Air journal October 2019
Monolithic Perovskite/Si Tandem Solar Cells: Pathways to Over 30% Efficiency journal April 2020
Atomic Layer Deposition of Functional Layers in Planar Perovskite Solar Cells journal October 2019

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