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DOE OSTI · 1874461

Surface engineering with oxidized Ti 3 C 2 T x MXene enables efficient and stable p-i-n-structured CsPbI 3 perovskite solar cells

Heo, Jin Hyuck·Zhang, Fei·Park, Jin Kyoung·Joon Lee, Hyong·Lee, David Sunghwan·Heo, Su Jeong·Luther, Joseph M.·Berry, Joseph J.·Zhu, Kai·Im, Sang Hyuk
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Abstract

All-inorganic CsPbI 3 perovskite has a near-ideal band gap, high thermal stability, and simple material composition, thus presenting a promising option for developing perovskite/Si tandem solar cells. However, CsPbI 3 undergoes a rapid phase transition under exposure to moisture and exhibits a significant performance gap relative to other perovskite compounds, particularly in the p-i-n structure favored for perovskite/Si tandems. In this work, we demonstrate highly efficient and stable p-i-n-structured CsPbI 3 perovskite solar cells by surface engineering the CsPbI 3 layer with oxidized Ti 3 C 2 T x MXene (OMXene) nanoplates via spray coatings. OMXene provides a physical barrier against moisture and improves charge separation at the perovskite-electron transporting layer interface via an enhanced electric field. Consequently, we demonstrated CsPbI 3 /OMXene-based p-i-n devices with efficiencies of 19.69% for 0.096-cm 2 cells and 14.64% for 25-cm 2 minimodules. The encapsulated minimodule showed good stability, retaining ~85% of the initial efficiency under simultaneous damp heat (85°C/85% relative humidity) and 1-sun light soaking for over 1,000 h.

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Heo, Jin Hyuck, Zhang, Fei, Park, Jin Kyoung, Joon Lee, Hyong, Lee, David Sunghwan, Heo, Su Jeong, Luther, Joseph M., Berry, Joseph J., Zhu, Kai, Im, Sang Hyuk. 2022-06-14. Surface engineering with oxidized Ti 3 C 2 T x MXene enables efficient and stable p-i-n-structured CsPbI 3 perovskite solar cells. https://doi.org/10.1016/j.joule.2022.05.013

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