한국진공학회:학술대회논문집 (Proceedings of the Korean Vacuum Society Conference)
- 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
- /
- Pages.162-162
- /
- 2011
Surface Plasmon Effect in Hot Electron Based Photovoltaic Devices
- Lee, Yeong-Geun (EEWS Graduate School, KAIST (Korea Advanced Institute of Science and Technology)) ;
- Jeong, Chan-Ho (EEWS Graduate School, KAIST (Korea Advanced Institute of Science and Technology)) ;
- Park, Jong-Hyeok (ETRI (Electronics and Telecommunications Research Institute)) ;
- Park, Jeong-Yeong (EEWS Graduate School, KAIST (Korea Advanced Institute of Science and Technology))
- 발행 : 2011.08.17
초록
Nanometer-sized noble metals can trap and guide sunlight for enhanced absorption of light based on surface plasmon that is beneficial for generation of hot electron flows. A pulse of high kinetic energy electrons (1-3 eV), or hot electrons, in metals can be generated after surface exposure to external energy, such as in the absorption of light or in exothermic chemical processes. These energetic electrons are not at thermal equilibrium with the metal atoms. It is highly probable that the correlation between hot electron generation and surface plasmon can offer a new guide for energy conversion systems [1-3]. We show that hot electron flow is generated on the modified gold thin film (<10 nm) of metal-semiconductor (TiO2) Schottky diodes by photon absorption, which is amplified by localized surface plasmon resonance. The short-circuit photocurrent obtained with low energy photons (lower than bandgap of TiO2, ~3.1-3.2 eV) is consistent with Fowler's law, confirming the presence of hot electron flows. The morphology of the metal thin film was modified to a connected gold island structure after heating to 120, 160, 200, and 240