All-vacuum deposited perovskite solar cells with glycine modified NiOx hole-transport layers. Issue 18 (7th April 2022)

• Record Type: Journal Article
• Authors: Fang, Cheng; Zhao, Qianqian; Zhao, Fuping; Huang, Fuzhi; Peng, Yong; Ku, Zhiliang; Cheng, Yi-Bing; Fu, Zhengyi
• Is Part Of: RSC advances. Volume 12:Issue 18(2022)
• Page Start: 10863
• Page End: 10869
• Publication Date: 2022-04-07
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra01360f
• Languages: English
• ISSNs: 2046-2069

Abstract

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. 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.