Efficiency enhancement in photoelectrochemical water splitting: defect passivation and boosted charge transfer kinetics of zinc oxide nanostructures via chalcopyrite/chalcogenide mix sensitization

Tuc Altaf, Cigdem and Abdullayeva, Nazrin and Coskun, Ozlem and Kumtepe, Alihan and Yıldırım, İpek Deniz and Erdem, Emre and Liu, Maochang and Bozbey, Ali and Agar, Ertan and Sankir, Mehmet and Sankir, Nurdan Demirci (2021) Efficiency enhancement in photoelectrochemical water splitting: defect passivation and boosted charge transfer kinetics of zinc oxide nanostructures via chalcopyrite/chalcogenide mix sensitization. Physical Review Materials, 5 (12). ISSN 2475-9953

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Abstract

ZnO thin films in nanorod (NR) and nanoflower (NF) morphologies were used as photoelectrode scaffolds for efficient visible-light-driven photoelectrochemical (PEC) water splitting process, where their decoration with copper indium gallium sulfide (CIGS) and indium sulfide (In2S3) layers resulted in significant PEC performance enhancement. ZnO NF/CIGS/In2S3 photoelectrodes exhibited a remarkably high PEC efficiency (∼6.0% applied bias photon-to-current efficiency, 83% incident photon-to-current efficiency) due to the negligible dark current, while ZnO NR/CIGS/In2S3 generated a photocurrent density of 30.0mA.cm-2 at 0.4 V (vs Ag/AgCl), being one of the highest performances reported in the literature for copper-based chalcopyrite photoelectrodes so far. The interfacial photoelectrode-electrolyte charge transport dynamics, investigated via intensity-modulated photocurrent spectroscopy, exhibited a sevenfold increase in charge transfer efficiencies with a significant drop in surface recombination kinetics for ZnO NF after CIGS/In2S3 decoration. The obtained results show consistency with numerically modeled electric field distribution profiles and electron paramagnetic resonance results of ZnO NF, rationalizing the enhanced charge transfer rates for decorated samples and confirming the defect passivating nature of CIGS/In2S3.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Emre Erdem
Date Deposited: 26 Aug 2022 21:00
Last Modified: 26 Aug 2022 21:00
URI: https://research.sabanciuniv.edu/id/eprint/43912

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