Cu-rich CuGaSe2 films grown on  oriented GaAs substrates by molecular beam epitaxy show a remarkable low temperature photoluminescence emission peaked at 1.620 eV. This emission can be attributed to a free-to-bound recombination accompanying a donor-to-acceptor pair recombination. The ionization energies of these states are found to be 3.4 and 108 meV, respectively, via temperature dependent photoluminescence. The 108 meV state is attributed to a donor and the 3.4 meV state to an acceptor state observed.
ASJC Scopus subject areas
- General Physics and Astronomy