Journal article

Micro-photoluminescence studies of shallow phosphorus diffusions below polysilicon passivating contacts

H Wu, HT Nguyen, D Yan, J Stuckelberger, W Chen, W Wang, D Macdonald

Solar Energy Materials and Solar Cells | Elsevier | Published : 2020

Abstract

Micro-photoluminescence spectroscopy is applied in this work to characterise the shallow phosphorus diffusions occurring below poly-silicon passivating contacts for silicon solar cells, courtesy of the bandgap narrowing effect in the heavily-doped region. We present the photoluminescence spectra from samples of various diffusion profiles, achieved by changing the phosphorus diffusion temperature and oxide interlayer thickness. The photoluminescence peak from the shallow phosphorus diffusion region, when normalised against the substrate crystalline silicon peak, changes in intensity in accordance with the dopant profiles. Photoluminescence spectra measured with two lasers of different penetra..

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