[9p-W331-1~11] 3.16 Optics and Photonics English Session

▲ [9p-W331-7] Plasmon-enhanced hot electron emission at thin-TiO₂/Au junction

〇Terunori Kaihara¹, Alfonso Cebollada², Gaspar Armelles², Hiromasa Shimizu¹ (1.Tokyo Univ. of Agri. & Tech., 2.IMN-CNM-CSIC)

Keywords:TiO2, surface plasmon, hot electrons

Titanium dioxide (TiO₂) has been widely investigated in a recent decade due to its various applications in biocompatible materials, gas sensors, photocatalysis, photovoltaics, etc. We studied the hot electron emission at a Schottky barrier consisting of a thin (a few nm) TiO₂ film and Au. Since the TiO₂ is thin enough to excite surface plasmons (SPP) at the TiO₂/Au interface with simple Kretschmann geometry, the opitcal intensity and thus the hot electron generation are concentrated at the interface, enhancing the internal quantum efficiency (IQE) by ~30 times from that without SPP particularly for lower photon energies.