Behrends, J. ; Lips, K. ; Boehme, C.: Observation of precursor pair formation of recombining charge carriers. Physical Review B 80 (2009), p. 045207/1-8
10.1103/PhysRevB.80.045207
Abstract:
An experiment is presented which allows the observation of charge carrier pair formation that precedes electronic transitions such as spin-dependent recombination or spin-dependent transport. It is based on an electrically detected magnetic resonance induced rotary echo sequence. The experimental demonstration is performed on precursor (spin) pairs of electrons in the emitter layer of crystalline silicon/amorphous silicon heterostructures. Precursor pair generation rate coefficients extracted from these measurements are studied as a function of light intensity and are found to show only a minor dependence on the illumination level indicating that the pair generation is not determined by charge carrier densities.