Emergence of Deep Levels in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">n</mml:mi></mml:math>-Type ZnSe under Hydrostatic Pressure

Abstract

Photoluminescence is measured in n-type ZnSe doped with Ga and Cl under pressures to 100 kbar (at 7 K). For each dopant, the rate of pressure shift of the self-activated band changes at 25--30 kbar from faster than to slower than that of the band gap. The change is evidence that a previously unknown deep donorlike state emerges from the electron continuum. This state probably is related to zinc vacancy-donor complexes, whose levels move lower in the gap with compression.