Theoretical Computation and Analysis of Spectra Response of Long Wave and Photogenerated Current in Gradient Mixed Crystal Si1-cGec Solar Cells
梯度Si_(1-c)Ge_c混晶太阳电池长波光谱响应及其短路电流的理论计算与分析

A new structure of Si/Si 1-c Ge\- c solar cells is presented and the distribution of photogenerated carries in Si\|based region and Si 1-c Ge\- c gradient region for the long wave radiation is solved.According to the current continuity principle,the Spectra Response (SR) was calculated.The influence of solar cell structure and max concentration in gradient region on the photogenerated current has also been discussed.The results show that under some conditions,the SR can be enhanced evidently by introducing the Si 1-c Ge\- c gradient region,but due to the simultaneous increases of c and the thickness of gradient region,the recombination throught the narrow band begins developing.The influence of the cell structure on device performance becomes more conspicuous.When the thickness of the gradient region is far smaller than that of the base region,the SR is lower than that of the same thickness in the base region of Si solar cells by the recombination and the electric field excluding.