Journal
NATURE PHOTONICS
Volume 16, Issue 5, Pages 352-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41566-022-00985-1
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Funding
- US Department of the Navy, Office of Naval Research Grant [N00014-20-1-2572]
- Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7)
- National Key Research Program [2021YFA0715502, 2016YFA0204000]
- National Science Fund of China [61935016]
- US Department of Energy [DE-SC0018208]
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-CARF/CCF-3079, OSR-2018-CRG7-3737]
- U.S. Department of Energy (DOE) [DE-SC0018208] Funding Source: U.S. Department of Energy (DOE)
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The energy landscape of reduced-dimensional perovskites (RDPs) can be tailored by adjusting their layer width. In this study, a method to increase the layer width of RDPs in 2D/3D heterostructures is reported to address electron blocking at the interface. This method allows for the development of efficient inverted perovskite solar cells with high stability.
The energy landscape of reduced-dimensional perovskites (RDPs) can be tailored by adjusting their layer width (n). Recently, two/three-dimensional (2D/3D) heterostructures containing n = 1 and 2 RDPs have produced perovskite solar cells (PSCs) with >25% power conversion efficiency (PCE). Unfortunately, this method does not translate to inverted PSCs due to electron blocking at the 2D/3D interface. Here we report a method to increase the layer width of RDPs in 2D/3D heterostructures to address this problem. We discover that bulkier organics form 2D heterostructures more slowly, resulting in wider RDPs; and that small modifications to ligand design induce preferential growth of n >= 3 RDPs. Leveraging these insights, we developed efficient inverted PSCs (with a certified quasi-steady-state PCE of 23.91%). Unencapsulated devices operate at room temperature and around 50% relative humidity for over 1,000 h without loss of PCE; and, when subjected to ISOS-L3 accelerated ageing, encapsulated devices retain 92% of initial PCE after 500 h.
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