Effect of Low Molecular Weight Fraction on Charge Transport Behavior of Conjugated Polymers
발표자
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초록
내용
Recently, significant progress has been made in conjugated polymer-based organic transistors by enhancing the intra-/inter-grain charge transport in conjugated polymer thin films. Here, we investigated the effect of molecular weight (MW) distribution on the charge transport property by controlling the fraction of low MW and high MW through the polymer purification. The electrical properties of a novel n-type naphthalenediimide-based copolymer were explored to study the correlation between the MW distribution of conjugated polymer and the charge transport property of an OFET. The P(C5NDIDTD-Se-BT-Se) thin films containing larger fraction of low MW polymers exhibited superior electron charge carrier mobility compared to films without low MW polymers. Additional experimental result showed that the low MW polymers in P(C5NDIDTD-Se-BT-Se) thin films provided charge transport bridges to extend the pi conjugation between adjacent grains and reduced the activation energy for charge hopping.