1995 Fiscal Year Final Research Report Summary
Dynamics of the Poto-induced Phase Transition in Pi-conjugated Polymer : Polydiacetylene
| Project/Area Number |
06452045
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
KOSHIHARA Shin-ya Tokyo Institute of Technology Department of Applied Physics, Associate Professor, 理学部, 助教授 (10192056)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Daynamical process / Poto-induced phase transition / Polydiacetylene / Time-resolved spectroscopy / Transient domain injection / Domain wall / Photocurrent |
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| Research Abstract |
The dynamical process of the photo-induced phase transition in polydiacetylene (PDA) single crystals has been investigated by time-resolved spectroscopy with varying temperature, excitation photon energy, and intensity. The photo-induced phase transition can be driven bidirectionally between the two (A and B) phases by dichromatic irradiation of a laser pulse, when the temperature of the PDA crystalis kept around the phase transition temperature (Tc). It was found that primary processof the photo-induced phase transition is mostly completed within 1 ns. In addition, occurrence of a transient domain injection has been confirmed at temperatures far below Tc. Together with the time-resolved measurement of photo-current, we have found a close correlation between the photocurrent intensity and the phase conversion efficiency. This suggest that the domain walls separating theA and B phases can carry the charge.
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