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arXiv 1409.7300cond-mat.mtrl-sci
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高复合光电倍增管中的电子束感应电流

Electron beam induced current in photovoltaics with high recombination

Paul M. Haney, Heayoung P. Yoon, Prakash Koirala, Robert W. Collins, Nikolai B. Zhitenev

摘要:

电子束感应电流(EBIC)是一种强大的表征技术,它提供了研究多晶太阳能电池所需的高空间分辨率。理想情况下,EBIC测量反映了器件的空间分辨量子效率。在这项工作中,EBIC测量的模型,适用于当耗尽区内的重组是实质性的。该模型的动机是横截面EBIC实验上的CdS-CdTe光电池,其中表明,载流子收集的最大效率是小于100 \%,并在整个耗尽区的变化。只有当迁移率-寿命乘积$μτ$在耗尽区内空间变化时,该模型才能再现实验结果。据推测,收集效率的降低与高注入效应以及由此产生的辐射复合增加有关。

英文摘要:

Electron beam induced current (EBIC) is a powerful characterization technique which offers the high spatial resolution needed to study polycrystalline solar cells. Ideally, an EBIC measurement reflects the spatially resolved quantum efficiency of the device. In this work, a model for EBIC measurements is presented which applies when recombination within the depletion region is substantial. This model is motivated by cross-sectional EBIC experiments on CdS-CdTe photovoltaic cells which show that the maximum efficiency of carrier collection is less than 100 \% and varies throughout the depletion region. The model can reproduce experimental results only if the mobility-lifetime product $μτ$ is spatially varying within the depletion region. The reduced collection efficiency is speculated to be related to high-injection effects, and the resulting increased radiative recombination.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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