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APPLIED PHYSICS LETTERS 86, 262108 2005. Photographic surveying of minority carrier diffusion length in polycrystalline silicon solar cells by electroluminescence. 指導老師 ： 林克默 博士 黃文勇 博士 學生 ： 郭怡彣 日期 ： 2010.09.23.
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APPLIED PHYSICS LETTERS 86, 262108 2005 Photographic surveying of minority carrier diffusion length inpolycrystallinesilicon solar cells by electroluminescence 指導老師 ： 林克默 博士 黃文勇 博士 學生 ： 郭怡彣 日期 ： 2010.09.23 Takashi Fuyuki,a Hayato Kondo, Tsutomu Yamazaki, Yu Takahashi, and Yukiharu Uraoka Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara 630-0192, Japan Received 23 November 2004; accepted 23 May 2005; published online 24 June 2005
Outline 1.Introduction 2.Results and discussion 3.Conclusions
1.Introduction • In order toget reliable high efficiency under a mass production process , quick and precise evaluation of cell performance and feedbackto production lines are indispensable. • For adetailed examination of cellperformance, the most importantmaterial parameter to be monitored, is the minority carrierdiffusion length ,which governs the collectionefficiency.
2.Results and discussion • Light emission fromsolar cells under the forward bias was captured by a CCDcamera, and we found that the intensity distribution of emissionclearly agreed with the mapping of the minority carrierdiffusion length in poly-Si active layers.
Emission intensity distribution in polycrystalline Si cell under theforward bias. A schematic viewgraph of the sample is inset. Distribution of the minority carrier diffusion length in the cellshown in Fig. 3 measured by the LBIC method.
Emission intensity as a function of the diffusion length at the correspondingmeasurement points. Solid lines are the fitting lines by the leastsquaresmethod.
3.Conclusions • Emission intensity increased linearly with the diffusionlength, and a possible emission mechanism was discussed. • This effective technique can be applied not only to as fabricatedcells, but also molded modules, and further developmentcorrelating the analysis of emission with cell performancewill be needed.
