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

本文研究了SiO_2@TiO_2核壳胶体晶体上两个相互关联的有序Au半壳阵列。(1)通过在不同SiO_2核-壳胶体晶体上蒸发Au，获得了不同尺寸的Au半壳阵列的光电化学性能。从实验和计算两个方面研究了Au半壳阵列的光学性质。带有Au半壳阵列的电极在所研究的范围内(300-1000 nm)表现出广泛的吸收。结果表明，直径为374 nm的中等尺寸SiO_2芯的光电极具有最高的PICS基光电流响应。根据FDTD模拟结果，高响应可以归因于电极上的高电场强度。(2)利用金属半壳阵列的二维结构，开发了金、银、铜半壳阵列固态光伏电池，它既是吸光体，又是集电体。在可见光照射下，所有电池都在透明掺氟氧化锡电极和金属半壳阵列电极之间产生了光电压。比较了银半壳电池与金、铜半壳电池的光伏性能。在固态PICS器件中，Ag半壳电池具有比Au和Cu半壳电池更高的光伏性能，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.