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Lattice marginal reconstruction enabled high ambient-tolerance Perovskite Quantum Dots phototransistors

Zhan, Shijie, Fan, Xiang-Bing, Zhang, Jiangbin, Yang, Jiajie, Bang, Sang Yun, Han, Soo Deok, Shin, Dong-Wook, Lee, Sanghyo, Choi, Hyung Woo, Wang, Xiaozhi, Hou, Bo, Occhipinti, Luigi G and Kim, Jong Min 2020. Lattice marginal reconstruction enabled high ambient-tolerance Perovskite Quantum Dots phototransistors. Journal of Materials Chemistry. C 10.1039/D0TC03838E

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Abstract

Perovskite quantum dots (PeQDs) have been developed rapidly as photoactive materials in hybrid phototransistors because of their strong light absorption, broad bandgap customizability, and defect-tolerance in charge-transport properties. The solvent treatment has been well recognized as a practical approach for improving the charge transport of PeQDs and the photoresponsivity of PeQD phototransistors. However, there is a lack of fundamental understanding of the origin of its impacts on the material’s ambient stability as well as phototransistor’s operational lifetime. Especially, the relationship between surface ligands dissociation and their microstructural reconstruction has not been fully elucidated so far. Herein, we report that a simultaneous enhancement of photoresponsivity and ambient tolerance for PeQD-based hybrid phototransistors can be realized via medium-polarity-solvent treatment on solid-state PeQDs. Our comprehensive optoelectronic characterization and electron microscopic study reveals that the crystal morphology, instead of surface ligands, is the dominating factor that results in the PeQD’s stability enhancement associated with the preservation of optical property and quantum confinement. Besides, we unveil a marginal reconstruction process occurred during solvent treatment, which opens up a new route for facets-oriented attachment of PeQDs along the <220> zone axis to suppress the damage from water molecules penetration. Our study yields a new understanding of the solvent impact on PeQD microstructures reconstruction and suggests new routes for perovskite materials and corresponding device operational stability enhancement.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Physics and Astronomy
Publisher: Royal Society of Chemistry
ISSN: 2050-7526
Date of First Compliant Deposit: 27 August 2020
Date of Acceptance: 26 August 2020
Last Modified: 08 Sep 2020 10:20
URI: http://orca.cf.ac.uk/id/eprint/134537

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