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Electronic transport properties of synthetic diamond thin films

Grant number: 11/17990-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2012
Effective date (End): December 31, 2012
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Adenilson José Chiquito
Grantee:Rosana Balena
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil


Synthetic diamond films have a high potential for technological applications due to some characteristics such as high thermal and electrical conductivity, high breakdown voltage, high electron mobility and high resistance to radiation. In order to use diamond films in practical devices, the study of the transport mechanism of carriers in doped diamond films as well as the development of a reproducible route for the fabrication of devices is needed; this study should take into account the role of the surface to obtain good electrical contacts. Thus, in this work we propose the study of the properties of electrical contacts, both rectifier and ohmic one in diamond films. For this, sets of samples with different doping (between 10^18 and 10^20 cm^-3) will be submitted to the cleaning processes and then used for the fabrication of devices. Such devices will be analyzed through experiments in which the current, resistivity and capacitance will be monitored as a function of parameters such as temperature. From the analysis of experimental data, we hope to obtain information about the properties of the contacts (Schottky barrier height and breakdown voltage, for example) and on the diamond films properties, such as density / distribution of carriers and the characteristic process of electrical conduction.