Intermixing studies in GaN1-xSbxhighly mismatched alloys.
GaN1-xSbxwith x∼5%-7% is a highly mismatched alloy predicted to have favorable properties for application as an electrode in a photoelectrochemical cell for solar water splitting. In this study, we grew GaN1-xSbxunder conditions intended to induce phase segregation. Prior experiments with the similar alloy GaN1-xAsx, the tendency of Sb to surfact, and the low growth temperatures needed to incorporate Sb all suggested that GaN1-xSbxalloys would likely exhibit phase segregation. We found that, except for very high Sb compositions, this was not the case and that instead interdiffusion dominated. Characteristics measured by optical absorption were similar to intentionally grown bulk alloys for the same composition. Furthermore, the alloys produced by this method maintained crystallinity for very high Sb compositions and allowed higher overall Sb compositions. This method may allow higher temperature growth while still achieving needed Sb compositions for solar water splitting applications.
Wendy L
WL
Sarney
Stefan P
SP
Svensson
Min
M
Ting
Natalie
N
Segercrantz
Wladek
W
Walukiewicz
Kin Man
KM
Yu
Robert W
RW
Martin
Sergei V
SV
Novikov
C T
CT
Foxon