Abstract
The high performance of electrodeposited cuprous oxide (Cu2O)-based photoelectrochemical (PEC) cells has been limited due to low electrical conductivity hindering effective carrier transport to electrodes and chemically unstable properties in aqueous environments, despite their several advantages such as suitable band gap, band position, and cost-effective and environmentally friend elements. To improve the fundamental photoelectrochemical properties of photocathode Cu2O layers, particularly their photocurrent and stability, we present a simple approach using a double-layer photocathode, where the double-layer structure consists of Sb-incorporated Cu2O (Cu2O:Sb) and undoped Cu2O. The Cu2O:Sb double layer enhanced the preferred crystal growth along the [111] direction, as well as the crystallinity of the Cu2O. This microstructural change resulted in high electrical conductivity owing to high hole mobility and the suppression of instability related to surface facets. Consequently, the introduction of Cu2O:S...
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