Traps and recombination centers in pure and Co-doped Bi"1"2SiO"2"0 crystals - Nesheva, D.; Aneva, Z.; Gospodinov, M. (Elsevier)
Pure and Co-doped (0.36-1.8 mol% Co) Bi"1"2SiO"2"0 crystals have been studied. The temperature dependence of the dark and photoconductivity, thermostimulated currents and the spectral dependence of the photoconductivity have been measured. Exponentially distributed traps situated close to the conduction band bottom have been found in pure BSO crystals. It was found that Co atoms act as donors in BSO crystals, and two new traps at about 0.24 and 0.45 eV appear. Based on the observed thermal quenching of the photocurrent an identical energy position of the ''slow'' recombination centers has been determined in both type of crystals. The defects responsible for the ''shoulder'' absorption (at about 2.7 eV below the conduction band) have been found to play the role of these ''slow'' recombination centers.
http://linkinghub.elsevier.com/retrieve/pii/0022-3697(93)90256-Q
Keywords: V; U