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Efficient charge separation and transport in a tandem solar cell with photoconducting Se sub-microtubes and AgBiS₂ quantum dots

Lookup NU author(s): Dr Heather Flint, Professor Elizabeth GibsonORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).

Abstract

© 2022 Elsevier B.V. This article describes a tandem photoelectrochemical cell that captures and converts visible to near infrared light to deliver a power conversion efficiency of ∼ 7%. In this tandem device the photocathode was prepared from p-type nickel oxide sensitized with silver bismuth sulfide (AgBiS2) quantum dots and was paired with a photoanode based on cadmium sulfide-sensitized titania. Trigonal-selenium sub-microtubes (t-Se s-μT) were anchored to the photoanode and served two roles: (1) enhancement of the conductivity under illumination (with holes as majority carriers); (2) co-sensitization provided more electron-hole pairs that increased the device performance by 1.5-fold. The separate p-type (AgBiS2/NiO−Ni) and n-type (TiO2/CdS/Se−Ni) solar cells were characterized as well as the (p/n) tandem cell architecture with a quasi-solid polysulfide/silica gel electrolyte under 1 sun illumination (AM 1.5G). The results provide scientific insights into the proposed charge flow mechanism via favourable energy level alignment in this unique device.

Publication metadata

Author(s): Kolay A, Flint H, Gibson EA, Deepa M

Publication type: Article

Publication status: Published

Journal: Chemical Engineering Journal

Year: 2022

Volume: 437

Issue: 1

Print publication date: 01/06/2022

Online publication date: 12/02/2022

Acceptance date: 09/02/2022

Date deposited: 08/04/2022

ISSN (print): 1385-8947

ISSN (electronic): 1873-3212

Publisher: Elsevier B.V.

URL: https://doi.org/10.1016/j.cej.2022.135223

DOI: 10.1016/j.cej.2022.135223

ePrints DOI: 10.57711/ga2j-y631

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