高效单晶硅太阳电池基区结构设计与参数优化

Base Structural Design and Parameter Optimization of High-efficiency Mono-Crystalline Silicon Solar Cells

首先利用TCAD半导体器件仿真软件全面系统地分析了在不同少子寿命的情况下,基区电阻率对常规P型单晶硅太阳电池输出特性的影响。然后基于对仿真结果的分析,提出一种具有非均匀基区的单晶硅太阳电池结构,并对其输出特性进行了仿真研究。结果表明:当少子寿命一定时,存在最优的基区电阻率,使得常规电池的转换效率最大;随着少子寿命的减小,电池最优的基区电阻率减小;提高基区电阻率有利于常规电池长波段量子效率和短路电流的提高,但同时会降低电池的开路电压和填充因子;当少子寿命较低时,非均匀基区结构不具有提高常规电池转换效率的作用。但当少子寿命增大到一定值时,通过优化非均匀基区的表面浓度,非均匀基区结构可有效改善常规电池的电学性能。

Firstly,influence of the base resistivity on the output behavior of conventional monocrystalline silicon solar cell is analyzed comprehensively under different minority carrier lifetime.Secondly,based on the analysis of simulation results,this paper puts forward a kind of mono-crystalline silicon solar cell structure with non-uniform doped base,and the simulation research is carried on its output characteristic.The simulation results show that when minority carrier lifetime remains at a fixed value,there is an optimal base resistivity to make the conventional solar cell reach its maximum conversion efficiency;With the decrease of the minority carrier lifetime,the optimal base resistivity decreased;The increase of the resistivity of the base is advantageous to the conventional solar cell quantum efficiency and short circuit current,but will reduce open circuit voltage and fill factor at the same time.When minority carrier lifetime is low,the non-uniform base structure does not improve the conventional solar cell conversion efficiency.But when minority carrier lifetime increases to a certain value,non-uniform base structure can improve the electrical performance of conventional solar cell effectively through optimizing the base non-uniform surface concentration.