Uniaxial Stress Effects on Exciton Spectra in PbI_2 Thin Film and PbI_2/CdI_2 Superlattice
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Uniaxial stress effects on exciton spectra in PbI<SUB>2</SUB> thin film and PbI<SUB>2</SUB>/CdI<SUB>2</SUB> superlattice at 77K are investigated for the first time. In PbI<SUB>2</SUB> thin film the observed exciton absorption peaks are found to have a pressure coefficient of -150±5meV/GPa. This value is different from that under hydrostatic pressure in bulk material and the difference reflects the smaller volume compression by the uniaxial stress. In PbI<SUB>2</SUB>/CdI<SUB>2</SUB> superlattice the uniaxial stress gives a large reduction of the well width and then yields a pressure coefficient of the exciton peak, -125±10 meV/GPa, being smaller in magnitude than that in thin film.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 745-747, 1998
The Japan Society of High Pressure Science and Technology