Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Although the best photocathodes for solar water splitting such as Si, GaInP2, GaP and copper indium gallium sulphide/selenide (CIGS) exhibit high solar to hydrogen conversion efficiencies, they either constitute rare metals or require high cost processing techniques. In order to develop large scale deployment of photoelectrochemical cells, there is a need to develop highly efficient PEC using low cost manufacturing techniques and earth abundant materials.
In this work, copper sulphide (Cu2-xS) were prepared using a simple sulphurization of copper metal. X-ray diffraction (XRD) and scanning electron microscopy (SEM-EDX) indicate that the films were Cu2-xS. These films were found to be a degenerate semiconductor from Mott-Schottky analysis (of the order of 1022 cm-3). Photoelectrochemical cells (PEC) were fabricated using these films by using CdS as a n-type electron extraction layer and followed by a protective TiO2 layer and then a Pt catalyst. Photocurrents of ~ 1.5 mA/cm2 were obtained from this PEC device at 0 V vs RHE in a pH 7 phosphate buffer with 1 hour of stability. Various strategies to improve the photocurrent and stability of these PECs will be discussed.
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