p-Type Transparent Conducting Oxide/n-Type Semiconductor Heterojunctions for Efficient and Stable Solar Water Oxidation
Efficient charge conduction from the light absorber to the water oxidation catalyst was realized with a transparent, hole-conducting oxide.
Significance & impact
P-type transparent conducting oxides (p-TCOs) coupled to semiconductor absorbers create efficient and stable water oxidation
Top: Schematic showing the efficient transfer of photo-excited
Bottom: Solar driven water oxidation performance of 25 mA·cm−2 at 1.23 V vs. RHE is among the highest reported for a Si-based
- NiCo2O4 was used as the p-TCO, with Si and InP as model light absorbers.
- The solid-solid interface between the p-TCO and
photoanodewas optimized for effective hole transport to the catalyst.
- Stability evaluation was performed by in situ Raman spectroscopy monitoring of the NiCo2O4structure and by
ultrasensitivedetection of corrosion products.