Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
J Am Chem Soc. 2011 Dec 7;133(48):19408-15. doi: 10.1021/ja205703c. Epub 2011 Nov 14.
Silicon nanowire arrays (SiNWs) on a planar silicon wafer can be fabricated by a simple metal-assisted wet chemical etching method. They can offer an excellent light harvesting capability through light scattering and trapping. In this work, we demonstrated that the organic-inorganic solar cell based on hybrid composites of conjugated molecules and SiNWs on a planar substrate yielded an excellent power conversion efficiency (PCE) of 9.70%. The high efficiency was ascribed to two aspects: one was the improvement of the light absorption by SiNWs structure on the planar components; the other was the enhancement of charge extraction efficiency, resulting from the novel top contact by forming a thin organic layer shell around the individual silicon nanowire. On the contrary, the sole planar junction solar cell only exhibited a PCE of 6.01%, due to the lower light trapping capability and the less hole extraction efficiency. It indicated that both the SiNWs structure and the thin organic layer top contact were critical to achieve a high performance organic/silicon solar cell.
硅纳米线阵列（SiNWs）可以通过简单的金属辅助湿法化学刻蚀方法在平面硅片上制备。它们可以通过光散射和捕获提供优异的光捕获能力。在这项工作中，我们证明了基于共轭分子和平面衬底上的 SiNWs 的杂化复合材料的有机-无机太阳能电池产生了 9.70%的优异功率转换效率（PCE）。高效率归因于两个方面：一方面是 SiNWs 结构在平面组件上提高了光吸收；另一方面是通过在单个硅纳米线周围形成薄的有机层壳来提高电荷提取效率，从而提高了电荷提取效率。相反，仅平面结太阳能电池的 PCE 仅为 6.01%，这是由于光捕获能力较低和空穴提取效率较低。这表明 SiNWs 结构和薄有机层顶接触对于实现高性能有机/硅太阳能电池都至关重要。
