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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:1542763
 [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

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.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S), PVRD2 Program
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1542763
Report Number(s):
NREL/JA-5900-74306
Journal Information:
Sustainable Energy & Fuels, Vol. 3, Issue 6
Country of Publication:
United States
Language:
English

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