Study of UV and subgap photocurrent response in diamond and BCN thin films for detector applications

Abstract

The near-optical absorption edge photoresponse in CVD diamond thin films, prepared by the CVD method, and the photoresponse in thin boron carbo-nitride (BCN) films, prepared by the rf-inductively coupled plasma CVD technique- have been studied. In case of diamond, the subgap nealing. It is shown that, in case of BCN films, the gap E-g and the slope of the fundamental absorption edge depend on deposition parameters. The energy slope E-0 of the Urbach tail is typically 300 meV for the nanocrystalline h-BCN films, and a typical value for E-g is about 6 eV.