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Luminescence from Electron–Hole Drops in Undoped GaP
Author(s) -
Schwabe R.,
Thuselt F.,
Weinert H.,
Bindemann R.,
Unger K.
Publication year - 1978
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.2220890228
Subject(s) - luminescence , atomic physics , excited state , radiative transfer , electron , conduction band , band gap , electron density , thermal conduction , electron hole , chemistry , molecular physics , condensed matter physics , materials science , physics , optics , optoelectronics , thermodynamics , nuclear physics
The radiative recombination from electron–hole drops (EHD) is investigated in highly excited pure GaP in the temperature range of T = 2 to 77 K. The fundamental parameters of the electronhole condensate are obtained by comparison of the experimental and calculated lineshape of the luminescence band, taking into account the “camel's back” density of states of the lower conduction band near the X‐point. The influence of the real density of states of the lower conduction band near the X‐point. The influence of the real density of states on the lineshape is discussed. The equilibrium carrier density and the work function are determined to be n eq = 7.4 × 10 18 cm −3 and Φ exp 15.5 meV, respectively. The “camel's back” depth is estimated to be δ = (9.1 × 1) meV. It appears that the critical temperature of the EHD is T c ≧ 70 K. Decay measurements led to the conclusion that the luminescence in the high energy tail of the band is caused by a radiative recombination from a gas‐like plasma.