Design of low bandgap tin–lead halide perovskite solar cells to achieve thermal, atmospheric and operational stability

Prasanna, Rohit; Leijtens, Tomas; Dunfield, Sean P.; Raiford, James A.; Wolf, Eli J.; Swifter, Simon A.; Werner, Jérémie; Eperon, Giles E.; de Paula, Camila; Palmstrom, Axel F.; Boyd, Caleb C.; van Hest, Maikel F.  A.  M.; Bent, Stacey F.; Teeter, Glenn; Berry, Joseph J.; McGehee, Michael D.

doi:10.1038/s41560-019-0471-6

Title: Design of low bandgap tin–lead halide perovskite solar cells to achieve thermal, atmospheric and operational stability

Journal Article · 07 October 2019 · Nature Energy

DOI: https://doi.org/10.1038/s41560-019-0471-6 · OSTI ID:1578261

^[1]; Leijtens, Tomas ^[2]; Dunfield, Sean P. ^[3];

^[4];

^[1]; Swifter, Simon A. ^[4]; Werner, Jérémie ^[3];

^[5]; de Paula, Camila ^[4]; Palmstrom, Axel F. ^[5];

^[1];

^[5]; Bent, Stacey F. ^[4];

^[5];

^[3]

Stanford Univ., CA (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
Stanford Univ., CA (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States); Swift Solar, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)
Stanford Univ., CA (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

Low bandgap tin-lead iodide perovskites are key components of all-perovskite tandem solar cells, but can be unstable because tin is prone to oxidation. Here, to avoid a reaction with the most popular hole contact, we eliminated polyethylenedioxythiophene:polystyrenesulfonate as a hole transport layer and instead used an upward band offset at an indium tin oxide-perovskite heterojunction to extract holes. To suppress oxidative degradation, we improved the morphology to create a compact and large-grained film. The tin content was kept at or below 50% and the device capped with a sputtered indium zinc oxide electrode. These advances resulted in a substantially improved thermal and environmental stability in a low bandgap perovskite solar cell without compromising the efficiency. The solar cells retained 95% of their initial efficiency after 1,000 h at 85 degrees C in air in the dark with no encapsulation and in a damp heat test (85 degrees C with 85% relative humidity) with encapsulation. Finally, the full initial efficiency was maintained under operation near the maximum power point and near 1 sun illumination for over 1,000 h.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: AC36-08GO28308; EE0008551

OSTI ID:: 1578261

Report Number(s):: NREL/JA--5900-75597

Journal Information:: Nature Energy, Journal Name: Nature Energy Journal Issue: 11 Vol. 4; ISSN 2058-7546

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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