In this work we present the first InAs avalanche photodiode (APD) for X-ray detection and demonstrate the improved energy resolution due to its avalanche gain. Under the radiation from a 55Fe radioactive X-ray source the full width at half maximum (FWHM) at 5.9 keV peak reduces as the avalanche gain increases. The FWHM drops from 2.02 keV at an avalanche gain of 1.58 to 950 eV at a gain of 5.3. The FWHM was larger than the fano-limited value due to the noise from accompanying electronics and the increased leakage current introduced by the diode packaging.
All Science Journal Classification (ASJC) codes
- Mathematical Physics