n型硅基纳米核壳结构径向异质结太阳电池TCAD模拟及光电转换研究

The technology of crystalline silicon gained continued progress and it will be the industrial mainstream for a long time. But the homogenization of photovoltaic products in China and unrestrained expansion of low-level product capacity reflect the lack of self-developed high efficiency solar cell and key technology, which is also implying the difficulties and challenges of increasing the efficiency and lowering the cost of conventional p-type crystalline silicon. Nanostructure, however, has novel physical and opto-elec properties and its utilization to increasing the efficiency of solar cell will be one of the important developing trends. In this project, we will form the nano-structure on the n-type silicon surface, and then conformally deposit the thin films around the nanostructure, forming the core-shell radial heterojunction solar cell. Combining the TCAD's strong functions of processing simulation and device modeling, the processing and structure of radial heterojunction solar cell can be optimized. In a way of theoretical simulation and experiment, we combine the high light-trapping properties, heterojunction's high open circuit voltage Voc and high short circuit current Isc together, forming the high efficiency novel core-shell radial heterojunction solar cell. We hope to obtain the proprietary intellectual property rights and key technology and do devotion to the sustainable development of photovoltaic industry.

传统异质结电池具有高效和高开路电压Voc特点，但异质结电池面临着的短路电流Isc很难提升的难题(异质结最好结果39.5mA/cm2，和晶体硅PERL电池的42.7 mA/cm2差别较大)。如何有效地提高异质结电池短路电流Isc是学术界和产业界共同关心的话题。本课题试图研究具有核壳结构的新型径向异质结电池，在n型晶体硅表面形成纳米结构，而后保角沉积生长薄膜形成核壳结构(core-shell)径向异质结电池，将硅纳米结构高效陷光特性、异质结高的开路电压(Voc)和径向异质结高的短路电流(Isc)三方优势结合起来，用以提升短路电流和电池性能。为此我们进行n型晶体硅核壳结构径向异质结光伏电池的TACD工艺仿真和理论模拟研究，优化器件结构和工艺，探索表面界面、光电转换过程等基本物理过程。最终达到新型径向异质结电池的高效(>22%)、高开路电压和高短路电流(>39.5mA/cm2)的目的。

传统异质结电池具有高效和高开路电压 Voc 特点，但异质结电池面临着的短路电流 Isc 很难提升的难题(异质结最好结果 39.5mA/cm2，和晶体硅 PERL 电池的 42.7 mA/cm2差别较大)。如何有效地提高异质结电池短路电流 Isc 是学术界和产业界共同关心的话题。本课题研究具有核壳结构的新型径向异质结电池，在 n 型晶体硅表面形成纳米结构，而后保角沉积生长薄膜形成核壳结构(core-shell)径向异质结电池，将硅纳米结构高效陷光特性、异质结高的开路电压(Voc)和径向异质结高的短路电流(Isc)三方优势结合起来，用以提升短路电流和电池性能。为此我们进行 n 型晶体硅核壳结构径向异质结光伏电池的 TACD 工艺仿真和理论模拟研究，优化器件结构和工艺，探索表面界面、光电转换过程等基本物理过程。最终达到新型径向异质结电池的高效(>22%)、高开路电压和高短路电流(>39.5mA/cm2)的目的。