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DOE OSTI · 2205581

Quantum-size-tuned heterostructures enable efficient and stable inverted perovskite solar cells

Chen, Hao·Teale, Sam·Chen, Bin·Hou, Yi·Grater, Luke·Zhu, Tong·Bertens, Koen·Park, So Min·Atapattu, Harindi R.·Gao, Yajun·Wei, Mingyang·Johnston, Andrew K.·Zhou, Qilin·Xu, Kaimin·Yu, Danni·Han, Congcong·Cui, Teng·Jung, Eui Hyuk·Zhou, Chun·Zhou, Wenjia·Proppe, Andrew H.·Hoogland, Sjoerd·Laquai, Frédéric·Filleter, Tobin·Graham, Kenneth R.·Ning, Zhijun·Sargent, Edward H.
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Abstract

The energy landscape of reduced-dimensional perovskites (RDPs) can be tailored by adjusting their layer width (n). Recently, 2D/3D heterostructures containing n = 1 and 2 RDPs have produced 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 in order 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. Levering these insights, we developed efficient inverted PSCs (certified 23.91% quasi-steady state efficiency). Furthermore, unencapsulated devices operate at room temperature and ~50% relative humidity for over 1000 hrs without loss of PCE; and, when subjected to ISOS-L3 accelerated aging encapsulated devices retain 92% of PCE after 500 hrs.

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Chen, Hao, Teale, Sam, Chen, Bin, Hou, Yi, Grater, Luke, Zhu, Tong, Bertens, Koen, Park, So Min, Atapattu, Harindi R., Gao, Yajun, Wei, Mingyang, Johnston, Andrew K., Zhou, Qilin, Xu, Kaimin, Yu, Danni, Han, Congcong, Cui, Teng, Jung, Eui Hyuk, Zhou, Chun, Zhou, Wenjia, Proppe, Andrew H., Hoogland, Sjoerd, Laquai, Frédéric, Filleter, Tobin, Graham, Kenneth R., Ning, Zhijun, Sargent, Edward H.. 2022-04-07. Quantum-size-tuned heterostructures enable efficient and stable inverted perovskite solar cells. https://doi.org/10.1038/s41566-022-00985-1

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