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Zero‐Dimensional Characteristic of the Trion Absorption in a Modulation‐Doped CdTe Quantum Well at High Depletion
Author(s) -
Cox R.T.,
Lovisa S.,
Picard E.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200103)224:1<207::aid-pssb207>3.0.co;2-3
Subject(s) - trion , doping , electron , condensed matter physics , absorption (acoustics) , cadmium telluride photovoltaics , absorption edge , schottky barrier , modulation (music) , quantum well , materials science , physics , exciton , optoelectronics , optics , band gap , quantum mechanics , laser , diode , acoustics
The electron concentration in a modulation‐doped CdTe quantum well is reduced by applying reverse bias to a transparent Schottky electrode on the sample surface. The absorption associated with creation of the excitonic trion then appears to have zero‐dimensional properties rather than the usual 2D properties. This suggests that, at high depletion, electrons become localised laterally in the electric potential fluctuations produced by the large number of positively charged donors in the doping plane situated close to the well edge.