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Surface Morphology and Spectroscopic Features of Homoepitaxial Diamond Films Prepared by MWPACVD at High CH4 Concentrations

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Autor(es):
Sierra Gomez, Javier ; Vieira, Jose ; Fraga, Mariana Amorim ; Corat, Evaldo Jose ; Trava-Airoldi, Vladimir Jesus
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: MATERIALS; v. 15, n. 21, p. 11-pg., 2022-11-01.
Resumo

Single crystal diamond (SCD) is a promising material to satisfy emerging requirements of high-demand fields, such as microelectronics, beta batteries and wide-spectrum optical communication systems, due to its excellent optical characteristics, elevated breakdown voltage, high hardness and superior thermal conductivity. For such applications, it is essential to study the optically active defects in as-grown diamonds, namely three-dimensional defects (such as stacking faults and dislocations) and the inherent defects arising from the cultivation method. This paper reports the growth of SCD films on a commercial HPHT single-crystal diamond seed substrate using a 2.45 GHz microwave plasma-assisted chemical vapor deposition (MWPACVD) technique by varying the methane (CH4) gas concentration from 6 to 12%, keeping the other parameters constant. The influence of the CH4 concentration on the properties, such as structural quality, morphology and thickness, of the highly oriented SCD films in the crystalline plane (004) was investigated and compared with those on the diamond substrate surface. The SCD film thickness is dependent on the CH4 concentration, and a high growth rate of up to 27 mu m/h can be reached. Raman spectroscopy, high-resolution X-ray diffractometry (HRXRD), scanning electron microscopy (SEM), surface profilometry and optical microscopic analyses showed that the produced homoepitaxial SCD films are of good quality with few macroscopic defects. (AU)

Processo FAPESP: 19/18572-7 - Novos materiais de carbono: suas aplicações espaciais, ambientais e spin offs relevantes
Beneficiário:Evaldo Jose Corat
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/18139-8 - Estudos de crescimento e de dopagens de diamante-CVD mono cristalino, colorido via descarga em mW 2,45 GHz de alta potência
Beneficiário:Mariana Amorim Fraga
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado