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Ellipsometry study on silicon nitride film with uneven thickness distribution by plasma-enhanced chemical vapor deposition

机译：Ellipsometry study on silicon nitride film with uneven thickness distribution by plasma-enhanced chemical vapor deposition

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摘要

As passivation layer and anti-reflection layer, silicon nitride (SiNx) thin film has been widely used in photovoltaic devices such as solar cells. The structure of SiNx film with uneven thickness distribution can make full use of different wavelengths of sunlight. In this paper, we have studied this structure for the first time. While introducing a quartz layer by plasma-enhanced chemical vapor deposition (PECVD), we obtained a thin SiNx film in the center and gradually thicker toward the edge. The effects of PECVD process parameters, including deposition time, RF power, dielectric layer thickness, etc. on the uneven thickness distribution of SiNx thin film are systematically studied. The film composition changing in the radial direction is also analyzed by spectroscopic ellipsometry and X-ray photoelectron spectroscopy. This study provides an instructive method for controlling the uneven thickness distribution of SiNx films and plays an important role in using this structure to the solar cell application.

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