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Perovskite superlattices with efficient carrier dynamics.
Lei, Yusheng; Li, Yuheng; Lu, Chengchangfeng; Yan, Qizhang; Wu, Yilei; Babbe, Finn; Gong, Huaxin; Zhang, Song; Zhou, Jiayun; Wang, Ruotao; Zhang, Ruiqi; Chen, Yimu; Tsai, Hsinhan; Gu, Yue; Hu, Hongjie; Lo, Yu-Hwa; Nie, Wanyi; Lee, Taeyoon; Luo, Jian; Yang, Kesong; Jang, Kyung-In; Xu, Sheng.
Affiliation
  • Lei Y; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Li Y; Department of Chemical Engineering, Stanford University, Stanford, CA, USA.
  • Lu C; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Yan Q; Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA, USA.
  • Wu Y; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Babbe F; Department of Chemical Engineering, Stanford University, Stanford, CA, USA.
  • Gong H; Chemical Sciences Division, Liquid Sunlight Alliance, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
  • Zhang S; Department of Chemical Engineering, Stanford University, Stanford, CA, USA.
  • Zhou J; Department of Chemical Engineering, Stanford University, Stanford, CA, USA.
  • Wang R; Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA, USA.
  • Zhang R; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Chen Y; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Tsai H; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Gu Y; Los Alamos National Laboratory, Los Alamos, NM, USA.
  • Hu H; Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA, USA.
  • Lo YH; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Nie W; Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA, USA.
  • Lee T; Los Alamos National Laboratory, Los Alamos, NM, USA.
  • Luo J; School of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea.
  • Yang K; Department of Bio and Brain Engineering, Korea Institute of Science and Technology, Seoul, Republic of Korea.
  • Jang KI; Department of Nanoengineering, University of California, San Diego, La Jolla, CA, USA.
  • Xu S; Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA, USA.
Nature ; 608(7922): 317-323, 2022 08.
Article in En | MEDLINE | ID: mdl-35948711
ABSTRACT
Compared with their three-dimensional (3D) counterparts, low-dimensional metal halide perovskites (2D and quasi-2D; B2An-1MnX3n+1, such as B = R-NH3+, A = HC(NH2)2+, Cs+; M = Pb2+, Sn2+; X = Cl-, Br-, I-) with periodic inorganic-organic structures have shown promising stability and hysteresis-free electrical performance1-6. However, their unique multiple-quantum-well structure limits the device efficiencies because of the grain boundaries and randomly oriented quantum wells in polycrystals7. In single crystals, the carrier transport through the thickness direction is hindered by the layered insulating organic spacers8. Furthermore, the strong quantum confinement from the organic spacers limits the generation and transport of free carriers9,10. Also, lead-free metal halide perovskites have been developed but their device performance is limited by their low crystallinity and structural instability11. Here we report a low-dimensional metal halide perovskite BA2MAn-1SnnI3n+1 (BA, butylammonium; MA, methylammonium; n = 1, 3, 5) superlattice by chemical epitaxy. The inorganic slabs are aligned vertical to the substrate and interconnected in a criss-cross 2D network parallel to the substrate, leading to efficient carrier transport in three dimensions. A lattice-mismatched substrate compresses the organic spacers, which weakens the quantum confinement. The performance of a superlattice solar cell has been certified under the quasi-steady state, showing a stable 12.36% photoelectric conversion efficiency. Moreover, an intraband exciton relaxation process may have yielded an unusually high open-circuit voltage (VOC).
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Full text: 1 Database: MEDLINE Language: En Year: 2022 Type: Article
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Full text: 1 Database: MEDLINE Language: En Year: 2022 Type: Article