Analysis of lateral current spreading in solar cell devices by spatially-resolved electroluminescence

Spatially-resolved electroluminescence (EL) images from solar cells contain information of local current distribution. By theoretical analysis of the EL intensity distribution, the current density distribution under a certain current bias and the sheet resistance can be obtained quantitatively. Two-dimensional numerical simulation of the current density distribution is employed to a GaInP cell, which agrees very well with the experimental results. A reciprocity theorem for current spreading is found and used to interpret the EL images from the viewpoint of current extraction. The optimization of front electrodes is discussed based on the results. (C) 2010 American Institute of Physics. [doi:10.1063/1.3431390]

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This work was supported in part by National Basic Research Program (Grant No. 2007CB936701), the Knowledge Innovation Project of CAS (Grant No. KGCX2-YW-324) and the International Cooperation Project of MOST (Grant No. 2009DFR60420).

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This work was supported in part by National Basic Research Program (Grant No. 2007CB936701), the Knowledge Innovation Project of CAS (Grant No. KGCX2-YW-324) and the International Cooperation Project of MOST (Grant No. 2009DFR60420).