Studies on coplanar radiation sensor based on diamond film

An X-ray diamond film sensor with coplanar electrode geometry was fabricated and an average charge collection efficiency of 45.8% at an applied electric field of 66.7kV/cm was obtained. Scanning electron microscopy and Raman scattering studies directly demonstrated that the different collection efficiencies of the coplanar and sandwich sensors mainly resulted from the different micro-structural features between the final growth side and the substrate side of the diamond film. The energy resolution of the diamond sensor significantly decreased with the applied electric field. A good energy resolution of 1.55 % was obtained at 66.7kV/cm for the coplanar diamond film sensor