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Polaronic Tunnelling in Organic Triblock Copolymers |
| LIU De-Sheng1,2,3;ZHANG Da-Cheng1,3;XIE Shi-Jie1,3;MEI Liang-Mo1,3 |
| 1School of Physics and Microelectronics, Shandong University, Jinan 250100
2Department of Physics, Jining Normal University, Jining 272025
3National Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 |
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| Cite this article: |
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LIU De-Sheng, ZHANG Da-Cheng, XIE Shi-Jie et al 2005 Chin. Phys. Lett. 22 178-181 |
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Abstract Polaron tunnelling is studied in xPA/nPPP/xPA (PA for polyacetylene and PPP poly (p-phenylene)) triblock copolymer, which has a well--barrier--well structure. An extended tight-binding Hamiltonian including external electric field is adopted. Without electric field, the injected electrons would not extend over the whole copolymer chain but instead be confined in the segments of PA. This is different from the behaviour of the traditional semiconductors. It is found that the polaron can transfer to the potential barrier-PPP segment when the applied electric field reaches a certain value. The critical polaron tunnelling electric fields depend upon the lengths of PPP segments.
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| Keywords:
66.35.+a
72.80.Le
85.35.Be
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Published: 01 January 2005
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| PACS: |
66.35.+a
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(Quantum tunneling of defects)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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85.35.Be
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(Quantum well devices (quantum dots, quantum wires, etc.))
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