Photoelectrochemical hydrogen generation with linear gradient Al composition dodecagon faceted AlGaN/n-GaN electrode
Journal
Optics Express
Journal Volume
22
Journal Issue
25
Pages
A1853-A1861
Date Issued
2014
Author(s)
Abstract
We demonstrated photoelectrochemical cells (PECs) with dodecagon faceted AlGaN/n-GaN heterostructure electrode for H2 generation, where the AlGaN/n-GaN heterostructure has a linear gradient Al composition (LGAC). The separation efficiency of the photo-generated electron-hole pairs in the electrode performs a key function in the H2 generation efficiency of PEC cells. The linear gradient Al composition, AlGaN, could create more internal field and light absorption because of the linear graded band gap. Therefore, the zero-bias photocurrent density of PEC cells with dodecagon facet LGAC AlGaN/n-GaN heterostructure electrode is around 5.9 times larger than that of dodecagon faceted n-GaN electrode. © 2014 Optical Society of America.
SDGs
Other Subjects
Aluminum; Aluminum gallium nitride; Efficiency; Electrodes; Energy gap; Gallium nitride; Hydrogen production; III-V semiconductors; Light absorption; Photoelectrochemical cells; Semiconductor alloys; Al composition; Graded band gaps; Internal field; Linear gradients; Photocurrent density; Photoelectrochemical hydrogen; Photogenerated electrons; Separation efficiency; Gallium alloys
Type
journal article