Heterostructure of CsPbBr3-CdS perovskite quantum dots for enhanced stability and charge transfer

Hunsur Ravikumar, C and Maroli, N and Kulkarni, B and Kolandaivel, P and Balakrishna, RG (2022) Heterostructure of CsPbBr3-CdS perovskite quantum dots for enhanced stability and charge transfer. In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 275 .

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Abstract

CsPbBr3 quantum dot (PQD) was interfaced with CdS quantum dot (QD), via modified hot injection method to form a heterostructure, across whose interface a significantly enhanced charge transfer is demonstrated. Formation of heterostructure (with retention of individual characteristics) was evidenced by various spectroscopy, microscopy and DFT tools. The heterostructure is observed to be much stable (one acting as pseudo protecting layer for the other) with enhanced electron lifetime and favorable band energy offset. CdS QDs reduce the strain within PQDs by holding them in a matrix kind of a structure, thus passivating the uncoordinated sites. It thus holds potential to be exploited for faster charge transfer in solar cell and other optoelectronic applications. Nature of PL quenching with growth of CdS QDs on PQDs, suggest energy transfer. The optimized formulation was also applied to liquid junction solar cells as sensitizers just to evidence the better electron transport, and charge separation properties. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Cadmium sulfide; Charge transfer; Electron transport properties; Energy transfer; II-VI semiconductors; Lead compounds; Nanocrystals; Perovskite; Perovskite solar cells; Semiconductor quantum dots, Band energy; CdS QDs; Cds quantum dots(QDs); Electron lifetime; Enhanced stability; Hot injection; Individual characteristics; Injection method; Lifetime; Protecting layer, Bromine compounds
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	31 Dec 2021 07:07
Last Modified:	31 Dec 2021 07:07
URI:	http://eprints.iisc.ac.in/id/eprint/70672

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