Waghmare, Ashish, Sharma, Vidhika, Shinde, Pratibha, Punde, Ashvini, Vairale, Priti, Hase, Yogesh, Pandharkar, Subhash, Nair, Shruthi, Aher, Rahul, Doiphode, Vidya, Shah, Shruti, Rahane, Swati, Bade, Bharat, Prasad, Mohit, Rondiya, Sachin and Jadkar, Sandesh 2022. Preparation and characterization of γ-In2Se3 thin-film photoanodes for photoelectrochemical water splitting. Journal of Solid State Electrochemistry 26 (1) , pp. 219-232. 10.1007/s10008-021-05054-1 |
Abstract
Indium selenide (γ-In2Se3) films were prepared using RF magnetron sputtering. Influence of deposition time on structural, optical, morphological, and photoelectrochemical (PEC) performance was studied. Formation of γ-In2Se3 is confirmed by low angle XRD, Raman spectroscopy, and XPS analysis. Surface morphology investigated using FE-SEM shows that γ-In2Se3 films are uniform and have a dense grain structure, without cracks and holes. Optical properties show that γ-In2Se3films absorb mainly in the UV region, and the bandgap energy decreases from 2.81 to 2.27 eV as deposition duration increases. Conduction and valance band-edge potential values show that γ-In2Se3 films are suitable for photoelectrochemical hydrogen evolution. PEC activity of γ-In2Se3 photoanodes was evaluated using linear sweep voltammetry (LSV), and there was an increase in photocurrent density with deposition time. Electron impedance spectroscopy (EIS) analysis revealed that γ-In2Se3 photoanodes had high charge transfer resistance, and it decreases with deposition time, which leads to improved PEC performance. Investigation of Mott Schottky's (MS) results shows a shifting of flat band potential towards negative potential, suggesting movement of fermi level towards conduction band edge. Carrier density increases from 3.7 × 1019 cm−3 to 8.9 × 1020 cm−3 and depletion layer width of γ-In2Se3 photoanodes are found in the range of ~ 2.67–9.10 nm. The gradual increase in electron lifetime indicates a decrease in the recombination rate of photo-generated charge carriers. An increase in time-dependent photocurrent density reveals that γ-In2Se3 films have effective electron–hole separation. Our work demonstrates that γ-In2Se3 can be a probable candidate for PEC water splitting and opto-electronic applications.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Chemistry |
Publisher: | Springer |
ISSN: | 1432-8488 |
Date of Acceptance: | 20 September 2021 |
Last Modified: | 21 Mar 2022 12:45 |
URI: | https://orca.cardiff.ac.uk/id/eprint/148269 |
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