Water – a source electrically active centres in CdHgTe

Influence of water solutions with various pH and electrochemical treatment in cathode position on concentration of charge carriers in samples Cd$_x$Hg$_{1-x}$Te with $x$ = 0.2–0.3 is investigated. Cathodic treatment cadmium-mercury- tellurium at small density current increases concentration of donors, and at high density acceptors are formed. It is supposed that hydroxyl groups create acceptors centers, introduce in interstitial cadmium-mercury-tellurium. At treatment for a long time (it is more than 20 h) or acceptors are formed with concentration at level of 10$^{16}$ cm$^{-3}$ (at high activity of hydrogen), or donors with concentration of 10$^{14}$ cm$^{-3}$ (at low activity of hydrogen) are uniform distribution on all thickness of cadmium-mercurytellurium film and does not vary with the subsequent increase in time of treatment.