传统的晶硅光伏电池单位质量的输出功率约0.82 W/g，而轻便的柔性薄膜有机光伏电池的单位质量的输出功率可以达到10 W/g。但是目前有机光伏电池的效率要比晶硅电池低的多。本研究通过结合有机半导体-薄膜纳米晶硅两类材料体系，利用薄膜纳米晶硅结构优异的陷光和电荷传输分离特性，结合柔性易加工的有机材料，构筑高效可弯折有机-薄膜晶硅光伏电池，实现单位质量的较高输出功率。晶硅薄膜层作为光的收集层、电荷分离和电子传输层，而有机材料作为硅表面钝化层、空穴的传输层、光学窗口并与硅形成异质结。在本研究中，如何对薄膜晶硅纳米结构表面及器件的界面进行有效调控，是实现高效率光伏电池的核心问题。本研究将发展有机-硅异质结光伏电池表界面表征及界面调控的多种技术平台，通过研究异质结光伏器件中电荷的产生、输运及复合等物理行为，对表面/界面实现有效调控，构建基于有机-硅杂化体系的轻便可弯折光伏器件。

The space-related high performance silicon photovoltaic device displays power to weight ratio of ~0.82 W/g, which is much lower than that of 10 W/g supplied by recently well investigated organic solar cell. However, the efficiency of organic silicon solar cell is much lower than that of silicon one. Here, we proposal that nanostructured thin film crystal silicon integrates with organic semiconductor to achieve high performance flexible and light-weight heterojunction photovoltaic devices with high power to weight ratio. In the heterojunction device, nanostructured silicon acts as light harvesting, charge separation and electron transporting layer, while organic layer plays as silicon surface passiviation layer, hole transport, optical window and building heterojunction with silicon. In this study, surface and interface passiviation is the key to achieve high efficiency device. We will develop surface passiviation ways to suppress charge recombination to improve the charge generation and transport to target high efficient and light weight foldable solar cell.