Numerical Simulation on Carrier Transport in a Thin-Film Amorphous Silicon Solar Cell with a Metal Grating
Date Issued
2012
Date
2012
Author(s)
Liao, Cheng-Yuan
Abstract
The carrier transport of a thin-film amorphous silicon (a-Si) solar cell with a metal grating is numerically simulated, for a given generation rate in the solar cell. The solar cell structure consists of three parts: an ITO layer as the top contact, an a-Si layer and a metal Ag grating layer as the back contact. It is a two-dimensional problem to simulate the carrier transport in the a-Si region. Using the Gummel iteration method, we get the self-consistent solutions of the electron and hole continuity equations and the Poisson equation for the entire region of a-Si. At each iteration step, we solve the two-dimensional problem by repeatedly using the related one-dimensional model. In other words, the equations are not solved simultaneously in the two-dimensional region to save the memory and computer time. The simulated results reveal that the maximum efficiency of such a solar cell is enhanced, as compared with the reference flat solar cell of the same volume of a-Si. For the maximum efficiency, it can be increased from 5.93% to 8.24%, with a relative enhancement of about 39%.
Subjects
solar cell
absorption enhancement
carrier transport
efficiency enhancement
metal grating
Type
thesis
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