新型柔性石墨烯/超薄硅异质结太阳能电池构建及其增效机理研究

柔性石墨烯/硅肖特基结太阳能电池因其原材料丰富、制备工艺简单且具有柔性、质轻、适用范围广等优势而备受关注，然而作为一种极具潜力的新型电池，如何改善其陷光能力、提高器件转换效率是其目前亟待解决的关键问题。本项目提出采用低成本纳米铜催化化学刻蚀技术在超薄硅基底表面制备大规模倒金字塔阵列结构，以实现增加光谱吸收及降低载流子表面复合之平衡。其次，创新性地将碳量子点引入至石墨烯/超薄硅界面处作为减反钝化介质和电子阻挡层，通过合理的纳米织化处理结合碳量子点的巧妙使用，最终实现高效柔性硅基太阳能电池的制备。通过探明碳量子点引入对石墨烯/硅界面势垒的影响规律，建立掺杂石墨烯、碳量子点以及硅基底之间的能带结构关系，从本质揭示新型电池结构的提效机理。该项目的实施将有助于解决目前新型柔性石墨烯/硅太阳能效率提升所面临的瓶颈问题，为推动新型太阳能电池技术的进步奠定理论及实践基础。

Flexible Graphene/ultra-thin silicon Schottky solar cell has trigged off much attention due to its easy accessible raw materials, simple preparation process, bendable, light and extensive application fields. However, as a great potential and novel solar cell, how to improve it’s light absorption of silicon substrate and enhance the power conversion efficiency should be solved urgently. This project presents a low-cost nano-copper particle catalyzed etching technology for texturing ultra-thin silicon with large scale inverted pyramid arrays, which is expected to balance between the optical absorption enhancement and surface recombination suppression. Additionally, the carbon quantum dot (CQD) layer, as passivation layer and electron blocking layer was firstly brought into the interface of ultra-thin silicon and graphene. Our work aims to fabricate the high efficiency flexible graphene/ultra-thin silicon solar cell solar cell by combining the suitable inverted pyramid arrays and masterly introduction of CQD layer. The efficiency enhancement mechanism of the device is discussed and essentially revealed through studying the effect of CQD layer introduction on the Schottky barrier and building the band diagrams of doped graphene, CQD and silicon substrate. The development of present project is beneficial to solve the bottlenecks of efficiency enhancement of novel flexible graphene/ultra-thin silicon solar cell, which would establish the theoretical and practical basis for promoting the advancement of novel solar cell technology.