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Research of a diamond-like carbon (DLC) films: promising candidate for absorber layer of solar cells

In this paper, successful fabrication of DLC thin films with tunable band gaps deposited by r.f. plasma-enhanced chemical vapor deposition (RF-PECVD) under different bias voltages is reported. By Ultraviolet Transmission Spectroscopy, it is revealed that the band gaps vary from 1.0eV to 2.1eV, which can cover the most important part of the solar spectrum for terrestrial application solar cells. And the mechanism that band gaps of DLC films varied with the bias voltages was analyzed by X-ray Photoelectron Spectroscopy (XPS). It is gotten that the different ratio of sp2/sp3 results in different band gaps, which is apparently resulted by different bias voltage during the deposition process. The band gap tends to have higher value at less sp2 content. The experiment results show that DLC multi-layer films can be used as an effective absorber layer for thin films solar cells.