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Detailed investigation of the role of surface motifs on the behavior of p-wse2 photocathodes
Velazquez, J. M. et al. A Scanning Probe Investigation of the Role of Surface Motifs in the Behavior of p–WSe2Photocathodes. Energy & Environmental Science, DOI: 10.1039/C5EE02530C (2015).
Detailed investigation of microscopic terraces in p–WSe2 single-crystal photocathode revealed these to be major sites of performance losses, challenging the traditionally accepted paradigm of edges as the sole source of deleterious electron-hole recombination.
Significance & impact
This study elucidates the structure-property-performance relationships of p-WSe2 photocathodes and provides valuable information on guiding the design of more efficient photoelectrodes from single crystals or thin films.
- p–WSe2 single crystals were synthesized by chemical vapor-transport method.
- Scanning photocurrent microscopy under relevant electrochemical environments was used to spatially differentiate performance at the microscale.
- The relationship between surface topography and performance was studied by a suite of ex situscanning probe techniques.