Investigation of 1/f Noise of p-type CdTe Detectors

This paper presents the results of experimental studies of transport and noise characteristics of CdTe single crystals. Though no universal mechanism has been identified for flicker noise or 1/f noise, it is the most ubiquitous form of noise in nature. Phenomena that have no obvious connection like heartbeat, cell membrane potential, financial data, DNA sequences and transistors exhibit fluctuations with a 1/f character. As the term "1/f" suggests, a spectral density that increases without limit as frequency decreases, characterizes this kind of noise. Flicker noise in the CdTe single crystals was studied. Two CdTe detectors were used; both have p-type conductivity. One of them has low-ohmic contacts (F33B8), another one have high-ohmic contact (452D).