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      All-vacuum deposited perovskite solar cells with glycine modified NiO x hole-transport layers†

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      RSC Advances
      The Royal Society of Chemistry

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          Abstract

          Organic–inorganic hybrid perovskite solar cells (PSCs) have attracted enormous research attention due to their high efficiency and low cost. However, most of the PSCs with high efficiencies still need expensive organic materials as their hole-transport layer (HTL). Obviously, the highly expensive materials go against the low-cost concept of advanced PSCs. In this regard, inorganic NiO x was considered as an idea HTL due to its good transmittance in the visible region and outstanding chemical stability. But for most of the PSCs with a NiO x HTL, the hole-extraction efficiency was limited by the unmatched valence band and too many surface defects of the NiO x layer, especially for the vacuum-deposited NiO x and perovskite. Herein, we developed a facile strategy to overcome this issue by using self-assembled glycine molecules to treat the NiO x surface. With glycine on the surface, the NiO x exhibited a deeper valence band maximum and a faster charge-extraction at the NiO x /perovskite interface. What's more, the vacuum-deposited perovskite showed a better crystallinity on the NiO x + glycine substrate. As a result, the PSCs with a glycine interfacial layer achieved a champion PCE of 17.96% with negligible hysteresis. This facile approach is expected to be further developed for fabricating high-efficiency PSCs on textured silicon solar cells.

          Abstract

          Self-assembled glycine molecules are used to modify E-beam evaporated NiO x films. The glycine interlayer improved the crystallinity and band alignment of perovskite with NiO x . The all vacuum-processed PSCs achieved a champion PCE of 17.96% with negligible hysteresis.

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          Author and article information

          Journal
          RSC Adv
          RSC Adv
          RA
          RSCACL
          RSC Advances
          The Royal Society of Chemistry
          2046-2069
          7 April 2022
          7 April 2022
          7 April 2022
          : 12
          : 18
          : 10863-10869
          Affiliations
          [a] State Key Laboratory of Advanced Technologies for Materials Synthesis and Processing, Wuhan University of Technology 122 Luoshi Road Wuhan 430070 Hubei Province China zhiliang.ku@ 123456whut.edu.cn zyfu@ 123456whut.edu.cn
          [b] Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216 Guangdong Province China
          Author information
          https://orcid.org/0000-0002-8635-9262
          https://orcid.org/0000-0002-4543-8212
          https://orcid.org/0000-0002-5363-378X
          https://orcid.org/0000-0002-4310-9247
          Article
          d2ra01360f
          10.1039/d2ra01360f
          8988663
          35425038
          3a14a40e-2741-457a-8205-a2d7184d70a3
          This journal is © The Royal Society of Chemistry
          History
          : 1 March 2022
          : 30 March 2022
          Page count
          Pages: 7
          Funding
          Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
          Award ID: 51972251
          Award ID: 91963209
          Funded by: Fundamental Research Funds for the Central Universities, doi 10.13039/501100012226;
          Award ID: 2020III0242D
          Categories
          Chemistry
          Custom metadata
          Paginated Article

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