Physics and current density-voltage characteristics of $a-Si_{1-x}Ge_x:H$ alloy p-i-n solar cells

$a-Si_{1-x}Ge_x:H$ 화합물(化合物) p-i-n 태양전지(太陽電池)의 물리(物理) 및 전류밀도(電流密度)-전압(電壓) 특성(特性)

The effects of Ge composition variation in $a-Si_{1-x}Ge_x:H$ alloy p-i-n solar cells on the physical properties and current density-voltage characteristics are analyzed by a new simulation modelling based on the update published experimental datas. The simulation modelling includes newly formulated density of gap density spectrum corresponding to Ge composition variation and utilizes the newly derived generation rate formulars which include the reflection coefficients and can apply to multijunction structures as well as single junction structure. The effects in $a-Si_{1-x}Ge_x:H$ single junction are analyzed through the efficiency, fill factor, open circuit voltage, short circuit current density, free carriers, trap carriers, electric field, generation rate and recombination rate. Based on the results analyzed in single junction structure, the applications to multiple junction structures are discussed and the optimal conditions reaching to a high performance are investigated.