Charge Mobilities in Organic Semiconducting Materials Determined by Pulse-Radiolysis Time-Resolved Microwave Conductivity: -Bond-Conjug

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• 作者：John M. Warman ; Matthijs P. de Haas ; Gerald Dicker ; Ferdinand C. Grozema ; Jorge Piris ; and Michael G. Debije
• 刊名：Chemistry of Materials
• 出版年：2004
• 出版时间：November 16, 2004
• 年：2004
• 卷：16
• 期：23
• 页码：4600 - 4609
• 全文大小：270K
• 年卷期：v.16,no.23(November 16, 2004)
• ISSN：1520-5002

文摘

A review is given of the one-dimensional, intrachain and intracolumnar, charge mobilities,ges/gifchars/Sigma.gif" BORDER=0 >ges/entities/mgr.gif">_1D, determined for ges/gifchars/pi.gif" BORDER=0 >-bond-conjugated polymeric and for ges/gifchars/pi.gif" BORDER=0 >-ges/gifchars/pi.gif" BORDER=0 >-stacked columnar discoticmaterials using the pulse-radiolysis time-resolved microwave conductivity technique. Thelargest values, on the order of 10 cm²/(V s), are found for single-crystal polydiacetylenespolymerized either thermally or with low doses of radiation. Much lower values of ges/gifchars/Sigma.gif" BORDER=0 >ges/entities/mgr.gif">_1D,covering the range from 0.009 to 0.125 cm²/(V s), are found for solution-synthesized conjugatedpolymers for which six different backbone structures have been investigated. This isattributed mainly to their complex morphology and the resulting static disorder in thebackbone structure. The highest mobilities for this class of material, ca. 0.1 cm²/(V s), arefound for liquid crystalline derivatives of polyfluorene and poly(phenylenevinylene). Largermobilities are found for discotic materials, with maximum values close to 1 cm²/(V s) inboth the crystalline solid and liquid crystalline phases. This is attributed to theirself-organizing nature and hence higher degree of structural order, which compensates forthe weaker electronic coupling between monomeric units in the discotics compared with thecovalently bonded conjugated polymers.