[10p-Z02-1~22] 15.4 III-V-group nitride crystals

[10p-Z02-22] In-situ photoluminescence of GaN photoelectrode during water splitting reaction

〇Tsutomu Minegishi¹, Soraya Shizumi², Ogus Ciftci², Yuki Imazeki², Masakazu Sugiyama^1,2 (1.RCAST, The Univ. of Tokyo, 2.EEIS, The Univ. of Tokyo)

Keywords:photocatalyst, photoelectrode, hydrogen, photoluminescence

GaN is one of the candidates of photocatalyst and/or photoelectrode owing to its stability and electronic structure. In the present study, in-situ photoluminescence (PL) of GaN photoelectrode during water splitting reaction was investigated. PL measurement with scanning applied potential detected quench of PL because of facilitated charge separation at above the flat-band potential. In addition, the broad emission related to the surface states were also quenched by increase of potential. In the presentation, activation and deactivation of states by applied potential, and influence of them on reaction will be discussed.