Role of chlorine in In2S3 for band alignment at nanoporous-TiO2/In2S3 interfaces

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Author list: Juma AO, Azarpira A, Steigert A, Pomaska M, Fischer CH, Lauermann I, Dittrich T

Publisher: American Institute of Physics

Place: MELVILLE

Publication year: 2013

Journal: Journal of Applied Physics (0021-8979)

Journal acronym: J APPL PHYS

Volume number: 114

Issue number: 5

Number of pages: 5

ISSN: 0021-8979

eISSN: 1089-7550

Languages: English-Great Britain (EN-GB)

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Abstract

Coatings of Cl-free and Cl-containing In2S3 (In2S3:Cl) layers were prepared by spray ion layer gas reaction on nanoporous TiO2 (np-TiO2). Charge separation in FTO/np-TiO2/In2S3: Cl, FTO/In2S3:Cl, FTO/np-TiO2/In2S3:acac, and FTO/In2S3:acac systems has been investigated by modulated surface photovoltage spectroscopy (SPV). The exponential defect tails below the band gap of In2S3 were reduced for In2S3:Cl. The analysis of the SPV spectra allowed to distinguish different mechanisms of charge separation and to deduce the conduction band offsets (about 0.3 eV and 0.05 eV for np-TiO2/In2S3:Cl and np-TiO2/In2S3:acac, respectively) in correlation with photoelectron measurements. (C) 2013 AIP Publishing LLC.

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