Studies of reflectivity and transport properties of crystals of porphyrin doped with2CdI4-2 、4I-1 、6I-1
| Autor: | Wei-Xin Lin, 林維新 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 This research studies the crystals of porphyrin doped with 2CdI4-2, 4I-, and 6I- by measuring the polarized reflection spectra (400nm~1050nm) and temperature dependent transport properties. The spectra of the three samples all reveal the fingerprints of porphyrin: B band (400nm~500nm) and Q band (500nm~700nm). We observe changes in the reflection spectra, when the direction of electric field of the incident light is changed. When the samples lie down, only H2TEPyP-2CdI4-2 shows isotropic B band; however, in the range from 700nm to 1050nm, all three samples have isotropy. On the contrary, when standing, all samples show anisotropy. Resistivity measurements were conducted by the four-wire method. At temperatures higher than the critical temperature, the conductivity rises drastically with rising temperature. The conductivity increases by 10~1000 times as the temperature rises from 85K to 325K. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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