Emitter Saturation Current Densities Determined by Self-consistent Calibration: Impact of Laterally Non-uniform Lifetime Distribution on Calibration Accuracy

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• 作者：Wensheng Liang ; Klaus J. Weber ; Daniel Walter ; Tom Ratcliff
• 关键词：self-consistent ; non-uniform ; lifetime ; passivation ; sat uration current density ; photoconductance
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：38
• 期：Complete
• 页码：114-123
• 全文大小：1811 K

文摘

The impact of laterally non-uniform carrier lifetime on the determination of the emitter saturation current(J_oe) from photoconductance-based measurements, based on the self-consistent method proposed by Trupke and Bardos, is investigated using a model assuming two adjacent regions with considerably difference J_oe. It is shown that the method can result in an underestimation of the mean J_oe if the distribution of the J_oe across the sensed area is not uniform. From simulation it is verified that t he error can be eliminated through independent measurement of the sample optical properties. The self-consistent calibration mechanism is also studied by the model. Experimental measurements con?rm the model predictions.