Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Organic-inorganic hybrid perovskite materials (ABX3; A=Cs, MA,FA; B=Pb,Sn, Sb; X = Cl, Br, I) have been in the focus of photovoltaics research since efficiencies of perovskite solar cells (PSCs) have increased from 3.8% to 25.2% in just a few years. In spite of their excellent photovoltaic performance, their instability to water and ambient moisture remains a critical challenge for the commercialization of high-efficiency PSCs. As shown recently, two-dimensional (2D) perovskites (M2An-1BnX3n+1, M is a long chain alkyl and aromatic molecule) exhibit excellent stability in comparison to 3D perovskites. Solar cells based on 2D perovskite materials have demonstrated remarkable progress and their efficiencies have already improved to over 18%. However, these devices are fabricated via solution processing, which has yet to prove feasibility for industrial mass production. Similar technologies such as OLED displays or organic solar cells have already been shown to be well applicable for commercialization using thermal evaporation in vacuum. Nevertheless, there are few reports of vacuum evaporated 2D perovskites. Moreover, the related optical and electrical properties have not been systematically investigated.
Here, we fabricate 2D perovskites via thermal evaporation and analyze their crystal structure and optical properties. XRD and GIWAXS data show significant peaks of 2D perovskite crystals, which are consistent with results from solution processing in literature. For the absorption and PL, the positions of characteristic peaks are also almost identical to films from previous reports using solution processing. All these results prove that we have successfully fabricated 2D perovskite films via vacuum evaporation for application in photovoltaics or LED devices.
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