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American Institute of Physics, Journal of Applied Physics, 5(114), p. 053711

DOI: 10.1063/1.4817766

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

Journal article published in 2013 by Albert Owino Juma, Albert Owino Juma, Anahita Azarpira, Alexander Steigert, Manuel Pomaska, Christian-Herbert Fischer, Iver Lauermann ORCID, Thomas Dittrich
This paper is available in a repository.
This paper is available in a repository.

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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.