Carrier Control in Sn-Pb Perovskites via 2D Cation Engineering for All-Perovskite Tandem Solar Cells with Improved Efficiency and Stability

Jinhui Tong, Qi Jiang, Andrew Ferguson, Axel Palmstrom, Xiaoming Wang, Ji Hao, Sean Dunfield, Amy Louks, Steven Harvey, Chongwen Li, Haipeng Lu, Ryan France, Samuel Johnson, Fei Zhang, Mengjin Yan, John Geisz, Michael McGehee, Matthew Beard, Yanfa Yan, Darius KuciauskasJoseph Berry, Kai Zhu

Research output: Contribution to journalArticlepeer-review

132 Scopus Citations

Abstract

All-perovskite tandem solar cells are promising for achieving photovoltaics with power conversion efficiencies above the detailed balance limit of single-junction cells, while retaining the low cost, light weight and other advantages associated with metal halide perovskite photovoltaics. However, the efficiency and stability of all-perovskite tandem cells are limited by the Sn–Pb-based narrow-bandgap perovskite cells. Here we show that the formation of quasi-two-dimensional (quasi-2D) structure (PEA)2GAPb2I7 from additives based on mixed bulky organic cations phenethylammonium (PEA+) and guanidinium (GA+) provides critical defect control to substantially improve the structural and optoelectronic properties of the narrow-bandgap (1.25 eV) Sn–Pb perovskite thin films. This 2D additive engineering results in Sn–Pb-based absorbers with low dark carrier density (~1.3 × 1014 cm−3), long bulk carrier lifetime (~9.2 μs) and low surface recombination velocity (~1.4 cm s−1), leading to 22.1%-efficient single-junction Sn–Pb perovskite cells and 25.5%-efficient all-perovskite two-terminal tandems with high photovoltage and long operational stability.

Original languageAmerican English
Pages (from-to)642-651
Number of pages10
JournalNature Energy
Volume7
Issue number7
DOIs
StatePublished - Jul 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Limited.

NREL Publication Number

  • NREL/JA-5900-81222

Keywords

  • carrier lifetime
  • defect passivation
  • perovskite
  • tandem

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