Simplified interconnection structure based on C60/SnO2-x for all-perovskite tandem solar cells
- University of North Carolina, Chapel Hill, NC (United States); Department of Applied Physical Sciences, University of North Carolina Chapel Hill, Chapel Hill, NC (United States)
- University of North Carolina, Chapel Hill, NC (United States)
- Arizona State Univ., Tempe, AZ (United States)
- University of North Carolina, Chapel Hill, NC (United States)
The efficiencies of all-perovskite tandem devices are improving quickly. However, their complex interconnection layer (ICL) structures – with typically four or more layers deposited by different processes – limit their prospects for applications. Here, we report an ICL in all-perovskite tandem cells consisting merely of a fullerene layer and a SnO2-x (060 layer is unintentionally n-doped by iodine ions from the perovskite and thus acts as an effective electron collecting layer. The SnO2-x layer, formed by the incomplete oxidization of tin (x=1.76), has ambipolar carrier transport property enabled by the presence of a large density of Sn2+. The C60/SnO1.76 ICL forms Ohmic contacts with both wide and narrow bandgap perovskite subcells with low contact resistivity. The ICL boosts the efficiencies of small-area tandem cells (5.9 mm2) and large-area tandem cells (1.15 cm2) to 24.4% and 22.2%, respectively. Lastly, the tandem cells remain 94% of its initial efficiency after continues 1-sun illumination for 1,000 hours.
- Research Organization:
- Univ. of North Carolina, Chapel Hill, NC (United States); University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- Grant/Contract Number:
- EE0008749
- OSTI ID:
- 1645622
- Alternate ID(s):
- OSTI ID: 1894780
OSTI ID: 1693431
- Journal Information:
- Nature Energy, Journal Name: Nature Energy Journal Issue: 9 Vol. 5; ISSN 2058-7546
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Mon Sep 20 00:00:00 UTC 2021
· Applied Physics Letters
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OSTI ID:1828870