KEYWORDS: Oxygen, Solar energy, Solids, Semiconductors, Optoelectronics, Photovoltaics, Chemical elements, Chemical species, Signal detection, Data modeling
We have studied the effects of composition and hydrostatic pressure on the direct optical transitions at the Γ point of the Brillouin zone in MBE-grown ZnOxSe1-x and ion-implantation-synthesized Zn1-yMnyOxTe1-x alloys. We observe a large O-induced band-gap reduction and a change in the pressure dependence of the fundamental band gap of the II-O-VI alloys. The effects are similar to those previously observed and extensively studied in highly mismatched III-N-V alloys. Our results are well explained in terms of the band anticrossing model that considers an anticrossing interaction between the highly localized oxygen states and the extended states of the conduction band of II-VI compounds. The O-induced modification of the conduction band structure offers an interesting possibility of using small amounts of O to engineer the optoelectronics properties of group II-O-VI alloys.
Incorporation of a few percent of nitrogen into conventional III-V compounds to form III-N-V alloys such as GaNAs and GaNP leads to a large reduction of the fundamental band gap. We show experimentally and theoretically that the effect originates from an anti-crossing interaction between the extended conduction-band states and a narrow resonant band formed by localized N states. The interaction significantly alters the electronic band structure by splitting the conduction band into two nonparabolic subbands. The downward shift of the lower conduction subband edge is responsible for the N-induced reduction of the fundamental band-gap energy.
Wayne McKinney, Michael Martin, John Byrd, R. Miller, Mike Chin, G. Portman, Edward Moler, Ted Lauritzen, J. McKean, Mark West, N. Kellogg, V. Zhuang, P. Ross, Joel Ager, Wei Shan, Eugene Haller
The design and initial commissioning of the first IR beamline at the ALS has been described previously. We report the final commissioning and first results of the mid-IR spectromicroscopy beamline 1.4.3. In addition, several improvements and two new branchlines are presented. Beamline 1.4.2 is connected to the front end under vacuum and consists of a Bruker Rapid- and Step-Scan vacuum FTIR bench. The modulated light is then coupled into a UHV surface science chamber for grazing incidence reflection studies. Several more external ports are available from the Bruker bench. Beamline 1.4.1 receives light from a separate port on the beamline 1.4 front end and connects to an optical table for photoluminescence and other experiments using photons with energies up to 6 eV.
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