金属－半導体周期構造によるプラズモン誘起電荷分離と光機能デバイスへの応用

本研究的重点是在SiO2@TiO2核壳胶体晶体上二维有序互连的Au半壳阵列。(1)不同尺寸Au半壳的光电化学性质通过将Au蒸镀到不同SiO2核的SiO2@TiO2胶体晶体上，得到了不同尺寸的Au半壳阵列。对Au半壳阵列的光学性质进行了实验和计算研究。具有Au半壳阵列的电极在检测范围（300-1000 nm）内显示出宽吸收。结果发现，具有直径为374 nm的中等尺寸的SiO2核的光电极显示出最高的基于PICS的光电流响应。根据FDTD模拟结果，高响应可以用电极处的高电场强度来解释。(2)金、银和铜半壳阵列光伏电池利用金属半壳阵列的二维结构，开发了固态电池，其既用作光吸收器又用作电流收集器。在可见光照射下，所有电池都在透明的掺氟氧化锡电极和金属半壳阵列电极之间产生光电压。比较了Ag半壳电池与Au和Cu半壳电池的光伏性能。银半壳电池具有比Au和Cu半壳电池更高的光伏性能，在固态PICS器件中实现了最高的功率转换效率（PCE）。

This study was focused on two dimensionally ordered and interconnected Au halfshell arrays on SiO2@TiO2 core-shell colloidal crystals.(1) Photoelectrochemical properties of Au Halfshells with Different SizesAu halfshell arrays with different sizes were obtained by evaporating Au onto the SiO2@TiO2 colloidal crystals with various SiO2 cores. The optical properties of the Au halfshell arrays are studied both experimentally and computationally. The electrodes with Au halfshell arrays showed broad absorption in the range examined (300-1000 nm). It was found that the photoelectrode with the middle-sized SiO2 cores of 374 nm diameter shows the highest PICS-based photocurrent responses. According to the FDTD simulated results, the high responses can be explained in terms of the high electric field intensity at the electrode.(2) Photovoltaic Cells with Gold, Silver, and Copper Halfshell ArraysSolid-state cells were developed by taking advantage of the two-dimensional structure of the metal halfshell array, which serves both as a light absorber and a current collector. Under visible light irradiation, all the cells generated photovoltage between the transparent fluorine-doped tin oxide electrode and the metal halfshell array electrode. The photovoltaic properties of Ag halfshell cells were compared with those of Au and Cu halfshell cells. The Ag halfshell cells had higher photovoltaic performance than Au and Cu halfshell cells, achieving the highest power conversion efficiency (PCE) among the solid-state PICS devices.