Charge Collection, Trapping and Release Phenomena in UV and X-ray Diamond Detectors with Laser Structured 3D Contact Architecture

Charge collection, trapping and release processes are investigated by spectrally resolved photocurrent measurements in unintentionally doped, single crystal diamond samples with different contact structures: planar (i.e., metal contacts on the top and bottom sides) and laser-formed three dimensional (3D) graphitic contacts. Under high energy pulsed X-ray excitation, charge releasing effects are observed, whose contribution affects the response linearity of the 3D detector, which can be recovered using a suitable photo-signal acquisition through a proper detection electronics.