[14a-C302-1~10] 4.1 Plasmonics

▲ [14a-C302-4] Visible light Photocurrent enhancement in STO thin films through Nb doping and Au Plasmons

〇(PC)Sugavaneshwar RamuPasupathi^1,2, Lakshminarayana Gandham^1,2,3, Thang Duy Dao^1,2, Kai Chen^1,2, Satoshi Ishii^1,2, Tadaaki Nagao^1,2,4 (1.MANA, NIMS, Japan, 2.CREST, JST, Japan, 3.Universiti putra, malaysia, 4.Hokkaido university, Japan)

Keywords:Surface plasmon, Defects, Photoelectric conversion

We studied the effect of Nb doping into the SrTiO3 (STO) for promoting the electron transport by Nb electron donors. Increase in the visible light activity was observed which is possibly associated with the creation of Sr defects that effectively acts as p-type co-dopants as the counterpart for Nb electron donors. Here we have synthesized Nb-doped STO films by wet chemical route and have studied the transmission and photocurrent characteristics of the pristine STO, Nb-doped STO and Au-loaded Nb-STO. An anodic photocurrent was observed with all STO samples. The increase in the conductivity by the both carriers as well as the defect-induced visible excitation was clarified to increase the photocurrent. We also examined the interplay between the defect-mediated excitations and plasmon on the visible photocurrent enhancement.