Characterizing amorphous silicon, silicon nitride, and diffused layers in crystalline siliconsolarcellsusingmicro-photoluminescence spectroscopy

Nguyen, Hieu T., Rougieux, Fiacre E., Yan, Di, Wan, Yimao, Mokkapati, Sudha ORCID: https://orcid.org/0000-0003-3260-6560, de Nicolas, Silvia Martin, Seif, Johannes Peter, De Wolf, Stefaan and Macdonald, Daniel 2016. Characterizing amorphous silicon, silicon nitride, and diffused layers in crystalline siliconsolarcellsusingmicro-photoluminescence spectroscopy. Solar Energy Materials and Solar Cells 145 (3) , pp. 403-412. 10.1016/j.solmat.2015.11.006

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Abstract

We report and explain the photoluminescence (PL) spectra from crystalline silicon (c-Si) wafers passivated by hydrogenated amorphous silicon (a-Si:H) films under various measurement conditions, utilizing the different absorption coefficients and radiative recombination mechanisms in c-Si and a-Si:H. By comparison with the luminescence properties of a-Si:H, we also demonstrate that SiNx films deposited under certain silicon-rich conditions yield luminescence spectra similar to those of a-Si:H, indicating the presence of an a-Si:H-like phase in the SiNx films. This causes a reduction in the blue response of the solar cells via parasitic absorption. In addition, with the ability to detect the specific emission from heavily-doped silicon via band-gap narrowing effects, we can unambiguously separate individual spectral PL signatures of three different layers in a single substrate: the SiNx passivation films, the diffused layers, and the underlying c-Si substrate. Finally, we apply this technique to evaluate parasitic absorption in the passivation films, and the doping density of the diffused layers on different finished solar cells, highlighting the value of this nondestructive c

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Elsevier
ISSN:	0927-0248
Date of Acceptance:	2 November 2015
Last Modified:	02 Nov 2022 11:13
URI:	https://orca.cardiff.ac.uk/id/eprint/101245

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