NDLI: Electrical Conduction Properties of Hydrogenated Amorphous Carbon Films with Different Structures

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Electrical Conduction Properties of Hydrogenated Amorphous Carbon Films with Different Structures

Content Provider	MDPI
Author	Tomidokoro, Masashi Tunmee, Sarayut Rittihong, Ukit Euaruksakul, Chanan Supruangnet, Ratchadaporn Nakajima, Hideki Hirata, Yuki Ohtake, Naoto Akasaka, Hiroki
Copyright Year	2021
Description	Hydrogenated amorphous carbon (a-C:H) films have optical and electrical properties that vary widely depending on deposition conditions; however, the electrical conduction mechanism, which is dependent on the film structure, has not yet been fully revealed. To understand the relationship between the film structure and electrical conduction mechanism, three types of a-C:H films were prepared and their film structures and electrical properties were evaluated. The sp 2/(sp 2 + sp 3) ratios were measured by a near-edge X-ray absorption fine structure technique. From the conductivity–temperature relationship, variable-range hopping (VRH) conduction was shown to be the dominant conduction mechanism at low temperatures, and the electrical conduction mechanism changed at a transition temperature from VRH conduction to thermally activated band conduction. On the basis of structural analyses, a model of the microstructure of a-C:H that consists of sp 2 and sp 3-bonded carbon clusters, hydrogen atoms and dangling bonds was built. Furthermore, it is explained how several electrical conduction parameters are affected by the carrier transportation path among the clusters.
Starting Page	2355
e-ISSN	19961944
DOI	10.3390/ma14092355
Journal	Materials
Issue Number	9
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-05-01
Access Restriction	Open
Subject Keyword	Materials Polymer Science Hydrogenated Amorphous Carbon Film Electrical Conduction Cvd Deposition Near-edge X-ray Absorption Fine Structure Variable Range Hopping
Content Type	Text
Resource Type	Article

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