TRANSVERSE POLARON BANDWIDTH IN TRANSPOLYACETYLENE

被引：8

作者：

CONWELL, EM ^{[1
]}

CHOI, HY ^{[1
]}

JEYADEV, S ^{[1
]}

机构：

[1] XEROX CORP,WEBSTER RES CTR,WEBSTER,NY 14580

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 07期

关键词：

D O I：

10.1021/j100186a009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Measurements over the temperature range 150 < T less-than-or-equal-to 300 K have shown that polarons (radical anions or cations) in trans-polyacetylene move perpendicular to the chains by hopping. This indicates that the transverse polaron bandwidth W is less than k(B)T in this temperature range, in contradiction to a previous calculation of W for T = 0. We have recalculated the bandwidth, extending the calculation to temperatures above 0 K and taking into account the change in overlap of the valence electron wavefunctions when the polaron hops. Because this overlap is a function of chain length, the resulting bandwidth and hopping rate will be sample dependent. Using the available information on conjugation lengths in polyacetylene, we find that the bandwidth is consistent with hopping dominated transport in the range where it is observed.

引用

页码：2827 / 2830

页数：4

共 22 条

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[2] NON-SOLITONIC NATURE OF PICOSECOND PHOTOCONDUCTIVITY IN TRANS-POLYACETYLENE [J].