Role of nitrogen in evolution of sp2/sp3 bonding and optical band gap in hydrogenated carbon nitride - Publication - MOST Wiedzy

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Role of nitrogen in evolution of sp2/sp3 bonding and optical band gap in hydrogenated carbon nitride

Abstract

Drastic changes in the bonding are found in amorphous hydrogenated carbon nitride (a-CNx:H) film as a function of nitrogen concentration (or N/C ratio). The total C-sp3 fraction and hardness shows a sharp decrease (at N/C = 0.40) whereas optical band gap and resistivity shows a gradual increase as nitrogen concentration increases from 0.07 to 0.58. Raman spectrum of a-CNx:H film is fitted with both Gaussian (integrated intensity ratios are used instead of the height ratios of the Lorentzian (D mode)) and Breit–Wigner–Fano (BWF, G Mode) method for a comparative study of optical properties and crystalline size of the graphite domain. Visible Raman (488 nm) spectroscopy finds that the in-plane crystalline size of graphite domains (La) is increased (from 34 to 38 Å) with nitrogen incorporation. Optical band gap of a-CNx:H solid measured by means of ellipsometry differs from the one obtained from Raman spectroscopy. In addition, we propose a simple extension of the existing band gap model to obtain the optical band gap of a-CNx:H film from Raman spectrum. Our estimation agrees well with the experimental value.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
VIBRATIONAL SPECTROSCOPY no. 66, pages 63 - 68,
ISSN: 0924-2031
Language:
English
Publication year:
2013
Bibliographic description:
Majumdar A., Das S., Bogdanowicz R., Shripathi T., Langel W., Hippler R.: Role of nitrogen in evolution of sp2/sp3 bonding and optical band gap in hydrogenated carbon nitride// VIBRATIONAL SPECTROSCOPY. -Vol. 66, (2013), s.63-68
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.vibspec.2013.01.013
Verified by:
Gdańsk University of Technology

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