CIS/CdS/ZnO/ZnO:Al modified photocathode for enhanced photoelectrochemical behavior under visible irradiation: Effects of pH and concentration of electrolyte solution

AuthorsMahdiyeh Esmaeili-Zare, Mohsen Behpour
Journali n t e r n a t i o n a l journal o f hydrogen energy
Presented bykashan
Page number8 2 7 3 2 8 1
Volume number45
Paper TypeFull Paper
Published At13-1-2020
Journal GradeISI
Journal TypeTypographic
Journal CountryAruba

Abstract

In this paper, the CuInS2 films were firstly modified with CdS and CdS/ZnO/ZnO:Al/Au
layers in order to improve the photoelectrochemical (PEC) water splitting efficiency. The
CuInS2 photoelectrode was synthesized by electrodeposition method as a facial and green
method, on the FTO substrate. The effects of pH and concentration of Na2S electrolyte
solution on the photocurrent density of photoelectrode samples were studied. As a p-n
junction photocathode, the CIS/CdS/ZnO/ZnO:Al/Au photoelectrode indicates the
enhanced PEC activity. The photocurrent density of CIS/CdS/ZnO/ZnO:Al/Au photoelectrode
reaches to 1.91 mA/cm2, while is about 2.5 times higher than that for CuInS2 film
at pH ¼ 8 (0.6 V vs Ag/AgCl). The formation of a p-n junction at the CuInS2 photoelectrode
surface not only reduces the recombination of electron-hole pairs but also increases the
PEC response and water splitting performance of the as-prepared CIS/CdS/ZnO/ZnO:Al/Au
photoelectrode.

Paper URL

tags: CIS/CdS Electrodeposition Photocathode p-n junction Surface modification Solar hydrogen