Transparent, flexible MAPbI3perovskite microwire arrays passivated with ultra-hydrophobic supramolecular self-assembly for stable and high-performance photodetectors

Rao, KDM and Hossain, M and Umesh, Umesh and Roy, A and Ghosh, A and Kumar, GS and Moitra, P and Kamilya, T and Acharya, S and Bhattacharya, S (2020) Transparent, flexible MAPbI3perovskite microwire arrays passivated with ultra-hydrophobic supramolecular self-assembly for stable and high-performance photodetectors. In: Nanoscale, 12 (22). pp. 11986-11996.

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Abstract

The emergence of organic-inorganic hybrid perovskites (OHPs) has revolutionised the potential performance of optoelectronic devices; most perovskites are opaque and hence incompatible with transparent optoelectronics and sensitive to environmental degradation. Here, we have reported a single-step fabrication of ultra-long MAPbI3 perovskite microwire arrays over a large area using stencil lithography based on sequential vacuum sublimation. The environmental stability of MAPbI3 is empowered with a newly designed and synthesized transparent supramolecular self-assembly based on a mixture of two tripodal l-Phe-C11H23/C7F15 molecules, which showed a contact angle of 105° and served as ultra-hydrophobic passivation layers for more than 45 days in an ambient atmosphere. The MAPbI3 microwire arrays passivated with the supramolecular self-assembly demonstrated for the first time both excellent transparency of ~89 at 550 nm and a remarkable photoresponse with a photo-switching ratio of ~104, responsivity of 789 A W-1, detectivity of 1014 Jones, linear dynamic range of ~122 dB, and rise time of 432 µs. Furthermore, the photodetector fabricated on a flexible PET substrate demonstrated robust mechanical flexibility even beyond 1200 bending cycles. Therefore, the scalable stencil lithography and supramolecular passivation approaches have the potential to deliver next-generation transparent, flexible, and stable optoelectronic devices.

Item Type:	Journal Article
Publication:	Nanoscale
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry.
Keywords:	Contact angle; Hydrophobicity; organic-inorganic materials; Passivation; Perovskite; Photodetectors; Photons; Self assembly; Synthesis (chemical), Ambient atmosphere; Environmental stability; Linear dynamic ranges; Mechanical flexibility; Organic-inorganic hybrid; Stencil lithography; Supramolecular self-assemblies; Vacuum sublimation, Supramolecular chemistry, article; atmosphere; contact angle; defense mechanism; hydrophobicity; vacuum
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	06 Feb 2023 07:15
Last Modified:	06 Feb 2023 07:15
URI:	https://eprints.iisc.ac.in/id/eprint/79872

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