Textured MAPbI3 Thin Films Achieved via Solvent Engineering in the Solution‐Shearing Process. Issue 1 (23rd August 2022)

• Record Type: Journal Article
• Authors: Smith, Benjamin T.; Thornton, Sean T.; Abdelmageed, Ghada; Kahwagi, Rashad F.; Elsebai, Rania; Chiriac, Vlad; Kim, Chang-Yong; Hinds, Sean; Koleilat, Ghada I.
• Is Part Of: Advanced photonics research. Volume 4:Issue 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-23
• Subjects: lead halide -- perovskites -- solution‐shearing -- solvent engineering; Photonics -- Periodicals; 621.36505
• DOI: 10.1002/adpr.202200088
• Languages: English
• ISSNs: 2699-9293

Abstract

Abstract : Solvent mixtures for making uniform, crystalline methylammonium lead iodide (MAPbI3 ) perovskite films are provided. The solvents dimethyl sulfoxide (DMSO), γ‐butyrolactone (GBL), and 1‐methyl‐2‐pyrrolidinone (NMP) are examined as well as their binary combinations to prepare solution‐sheared perovskite films at higher than 150 °C temperatures. Characterization methods such as imaging, X‐ray diffraction, grazing‐incidence wide‐angle X‐ray scattering, and photoluminescence (PL) to evaluate the crystal size, quality, and ordering that determine the viability of these films for device applications are explored and then a perovskite solar cell is made to test the stability of the most promising film. Excellent macroscopic crystals, over 1 mm in length, are achieved using a solvent mixture containing equal volumes of DMSO and NMP. These superior 3D MAPbI3 films, which retain solvent–perovskite intermediate phases and exhibit high crystalline ordering, are essential for high‐performing and stable optoelectronic devices. Abstract : Solvents and solvent mixtures are used to make perovskite thin films by solution‐shearing deposition. Their structure, crystallography, and light response are examined. A perovskite solar cell is made, and its stability is measured. Its excellent light response and stability are achieved through superior crystal size. The textured films exhibit unprecedented crystalline ordering for polycrystalline perovskite thin films.