Fully solvent-free preparation of MAPbI3 films for photovoltaic application
Emanuele Smecca a, Ajay Jena b, Ioannis Deretzis a, Gyu Min Kim b, Yohuei Numata b, Silvia Scalese a, Giovanni Mannino a, Corrado Bongiorno a, Antonino La Magna a, Tsutomu Miyasaka b, Alessandra Alberti a
a CNR-IMM, Istituto per la Microelettronica e Microsistemi, Strada VIII n°5, 95121 Catania, Italy
b Graduate School of Engineering, Toin University of Yokohama, 1614, Kurogane-cho, Aoba, Yokohama, Kanagawa, Japan 225-8503
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Alessandra Alberti, 104
Publication date: 11th February 2019

Hybrid Organic-Inorganic Perovskites have attracted a remarkable attention by the scientific community due to their great properties in the field of Photovoltaics 1–4. Nonetheless, their lack of stability and their loss of performance in humid air ambient5.6, joined with the lack of good uniformity in the large area reachable with the classic spin coating technology, are slowing down their marker uptake. New techniques were recently developed where researcher tried to mix physical deposition techniques with the classic solvent methods by two different steps for the PbI2 and MAI. But in many cases, an additional final solvent treatment must be performed to have good quality films. In this work we have prepared MAPbI3 by a “fully solvent-free” process on different substrates. MAPbI3 were deposited by two steps proximity thermal evaporation technique where the substrate is located close to the melting pot and is self-heated by the reagents powder. The layers deposited were characterized in terms of crystal structure by XRD analyses, that showed the presence only of the main peak related to the MAPbI3 structure, and in terms of morphology by SEM/TEM analyses that revealed a flat uniform coverage of the substrates on flat substrates while flake grain shape on rough FTO substrates.  As proof of concept, solar cell architectures were prepared using Spiro-MEOTAD as Hole Transporting Layer and gold to exploit the new up-scalable and clean deposition method.


nelli, T. Miyasaka, A. La Magna and A. Alberti: Phys. Chem. Chem. Phys., 2016, 18, 13413–13422.

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