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On the theory of time‐resolved band‐tail luminescence in amorphous semiconductors
Author(s) -
Esser B.
Publication year - 1982
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/pssb.2221140121
Subject(s) - electron , quantum tunnelling , atomic physics , radiative transfer , excited state , laser linewidth , luminescence , physics , coulomb , semiconductor , condensed matter physics , spontaneous emission , molecular physics , laser , optics , optoelectronics , quantum mechanics
The time‐dependent moments of a luminescence band due to radiative recombination within electron‐hole pairs localized in band tail states are calculated. Besides the radiative process a competing non‐radiative process by tunneling of the excited electrons (or holes) to defect centres is assumed. The time dependence of the centre of the band ω c ( t ) and the linewidth σ( t ) are shown to be determined by the time evolution of the tail region from which the electrons effectively recombine at t as well as from the time‐dependent electron‐hole separation in the Coulomb interaction. These two mechanisms act in an opposite way and as a result a non‐monotonous behaviour in both ω c ( t ) and σ( t ) observed experimentally is obtained.