Influence of the charge state of recombination centers on the photosensitivity of semiconductors

Journal Article · Thu Dec 01 00:00:00 EST 1988 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:5972599

Karakis, Yu N; Vasilevskii, D L; Moreno, K; Serdyuk, V V

The introduction of recombination centers with significantly different capture cross sections for the majority (S/sub n/) and minority (S/sub p/) charge carriers (W/sub p//S/sub n/ > 10/sup 4/) into photosensitive semiconductors such as CdSe, CdS, and some other compounds significantly increases the lifetime of the nonequilibrium electrons /tau//sub n/ in a number of cases. The authors made an attempt to precisely describe the variation of the lifetime of the majority current carriers in a semiconductor with enhanced photosensitivity. The results of the calculations show that the variation of the lifetime of the majority charge carriers in a sample with enhanced photosensitivity depends on the charge state of the centers which play the role of the rapid-recombination centers. When these centers are positively charged, /tau//sub n/ increases by /approx/2 orders of magnitude. If the electrons are captured in neutral levels, the lifetime /tau//sub n/ varies to a considerably greater degree. In both cases, an increase in the photoexcitation intensity results, as expected, in a decrease in /tau//sub n/ in a crystal with increased photosensitivity.

• Research Organization: I.I. Mechnikov Odessa State Univ. (USSR)
• OSTI ID: 5972599
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Vol. 24:7; Other Information: Translated from Izv. Akad. Nauk. SSSR, Neorg. Mater.; 24: No. 7, 1208-1210 (Jul 1988)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE CARRIERS
RECOMBINATION
SEMICONDUCTOR MATERIALS
PHOTOSENSITIVITY
CAPTURE
CARRIER DENSITY
CARRIER LIFETIME
CHARGE COLLECTION
CHARGE STATE
ELECTRON DENSITY
ELECTRONS
EXCITATION
HOLES
MATHEMATICAL MODELS
PHOTOCONDUCTORS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
FERMIONS
LEPTONS
LIFETIME
MATERIALS
SENSITIVITY
360603* - Materials- Properties
360602 - Other Materials- Structure & Phase Studies