Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, 215123, China.
ACS Nano. 2010 Oct 26;4(10):5869-76. doi: 10.1021/nn101980x.
Photoelectrochemical (PEC) cells based on silicon nanowire arrays (SiNWs) have, to date, exhibited modest power conversion efficiency (PCE) and suffered serious degradation, though they exhibit advantageous properties of charge-transfer/transport properties at the radial-junction and strong light-trap capabilities. The main challenge for this low-cost PEC cell is the surface photooxidation and photocorrosion of the silicon surface when contacting with the electrolyte. In this report, SiNWs derivatized with covalently attached methyl groups, prepared via a two-step chlorination/methylation procedure, demonstrate excellent stability even in the presence of water. Furthermore, SiNWs PEC cells utilizing a room temperature ion liquid (IL) acting as an electrolyte solvent display neglectable surface oxidation. A PEC cell based on a platinum (Pt) nanodots decorated and methylated (-CH(3)) SiNWs electrode in combination with an IL electrolyte yields a PCE of 6.0% and shows excellent stability under simulated air mass (AM) 1.5 solar spectrum irradiation, while the PCE of a PEC cell based on planar silicon only exhibits 0.003%. The inherent performance of these structures indicates that a -CH(3) (Pt) SiNWs electrode in combination with an IL is a new approach to develop a high-performance and low-cost solar cell.
基于硅纳米线阵列（SiNWs）的光电化学（PEC）电池迄今为止表现出适度的功率转换效率（PCE）和严重的降解，尽管它们表现出在径向结处的电荷转移/输运性质的有利性质和强的光捕获能力。这种低成本 PEC 电池的主要挑战是硅表面与电解质接触时的表面光氧化和光腐蚀。在本报告中，通过两步氯化/甲基化程序共价附着甲基基团的 SiNWs 即使在存在水的情况下也表现出优异的稳定性。此外，利用室温离子液体（IL）作为电解质溶剂的 SiNWsPEC 电池显示出可忽略不计的表面氧化。基于在甲基化（-CH（3））SiNWs 电极上修饰有铂（Pt）纳米点并结合 IL 电解质的 PEC 电池的 PCE 为 6.0％，并在模拟空气质量（AM）1.5 太阳光谱照射下表现出优异的稳定性，而基于平面硅的PEC 电池的 PCE 仅为 0.003％。这些结构的固有性能表明，-CH（3）（Pt）SiNWs 电极与 IL 的结合是开发高性能和低成本太阳能电池的一种新方法。
