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1 - 25 of 6
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Vardeny, Zeev Valentine | Optical picosecond studies of hot carriers in amorphous semiconductors | Thermalization of photogenerated carriers in a-Si, a-Si:H, a-As2Se3 and a-Se was studied by measuring the photoinduced absorption with subpicosecond resolution. The thermalization process can be described by Frohlich interaction with polar phonons in a-Si:H and a-As2Se3 but not in a-Si. Using photo... | Photogenerated carriers; Thermalization | 1981-10 |
| 2 |
 | Vardeny, Zeev Valentine | Photo induced infrared active phonons in trans polyacetylene | We measured photogenerated ir active phonons in trans-(CH) by the photoinduced absorption technique. A correlation was found to exist with a photoinduced absorption band in which electronic transitions are involved. Our results show photoproduction of free charged defects with long lifetimes. | Photoinduced phonons; Trans polyacetylene | 1983-06 |
| 3 |
 | Vardeny, Zeev Valentine | Photogenerated gap states in polyacetylene | We have measured the optical absorption spectrum of photogenerated gap states in polyacetylene, (CH)X . From a comparison with electroabsorption spectra the charge state of the excitations is determined. In both isomers of (CH)X locally neutral (exciton-like) states are observed. In addition a charg... | Gap state; Photoexcitation | 1983-06 |
| 4 |
 | Vardeny, Zeev Valentine | Picosecond dynamics of carriers in amorphous semiconductors | Using time resolved photoinduced absorption with subpicosecond resolution we studied hot carrier thermalization followed by deep trapping and recombination in a-Si, a-Si:H, a-Si:F, a-Si:H:F and a-As2Se3. In a-Se and a-As2S3_xSex (0.25 < x < 0.75) the observed relaxations were attributed to geminat... | Excess carriers; Thermalization | 1981-10 |
| 5 |
 | Vardeny, Zeev Valentine | Picosecond photoinduced optical anisotropy in trans-(CH)x : direct measurement of soliton diffusion | Photoinduced dichroism caused by bleaching of the interband transition in trans - (CH)X was observed in the picosecond time domain. The bleaching is induced instantaneously and decays with time as t - 1 / 2 , changing to a lower power after ~ 50 ps. Although the photoinduced bleaching persists to l... | Trans-(CH)x; Soliton diffusion; Bleaching; Photoinduced dichroism | 1983-06 |
| 6 |
 | Vardeny, Zeev Valentine | Time resolved spectroscopy of photoinduced absorption in glow-discharge a-Si:H | The time and temperature dependence of the photoinduced absorption spectra was measured in glow-discharge a-Si:H in the energy range 0.7 to 1.4 eV, temperature interval 10 to 306K and time domain 2 ys to 2 ms. The results are consistent with a model based on thermalization of excess carriers in tra... | Photoinduced absorption; Glow-discharge a-Si:H; Thermalization; Excess carriers; Trap states; Time dependence; Temperature dependence | 1981-10 |
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