Methane-induced texturing of chemical vapor deposition diamond films and correlation with UV photoresponse

摘要

The aim of the present work was to investigate the correlation between response to UV photons andcrystal orientation in diamond films. Some chemical vapor deposition diamond samples were exposedto UV radiation (4-6 eV) and the photocurrent measured applying several electric fields. Theorientation of diamond films has been checked by X-ray diffraction and the resulting spectra wereused to define the percentage of texture. The results of our experiments show a clear correlationbetween UV photoresponse and film texture, obtained by varying the methane concentration in thegrowth plasma. Also, less oriented polycrystalline films have a better response than highly (100)textured films in terms of photocurrent and signal to noise ratio.