Abstract
AbstractThe photoluminescence (PL) spectra of the monoclinic modification of the semiconductor crystal ZnP2 (β‐ZnP2) are studied under high, intermediate, and low laser excitation intensities at liquid helium temperature. Under high excitation intensities the inverse hydrogenlike M‐series was observed. It is symmetrical with the hydrogen‐like excitonic series. This M‐series is due to the two‐electron transitions from the excitonic molecule (biexciton) state to the ground, excited, and ionized excitonic states. The binding energy of the biexciton in β‐ZnP2 is determined as Δbex = 14.9 meV (0.32 of exciton Rydberg). Under intermediate excitation intensities another G‐band appears in the PL spectrum of β‐ZnP2. This band is interpreted as a result of two‐photon annihilation of free excitonic molecules in the gas phase. A narrow C‐line appears in the PL spectrum under intermediate excitation intensities, too. The analysis of the temperature dependence of the C‐line intensity allows us to assume this line to be the result of two‐photon annihilation of the biexcitons condensed into a dielectric liquid with the binding energy ΔL ≈︁ 0.5 meV.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
