Ε‐Branched Flexible Side Chain Substituted Diketopyrrolopyrrole‐Containing Polymers Designed for High Hole and Electron Mobilities. (20th November 2014)

• Record Type: Journal Article
• Authors: Han, A‐Reum; Dutta, Gitish K.; Lee, Junghoon; Lee, Hae Rang; Lee, Sang Myeon; Ahn, Hyungju; Shin, Tae Joo; Oh, Joon Hak; Yang, Changduk
• Is Part Of: Advanced functional materials. Volume 25:Number 2(2015)
• Page Start: 247
• Page End: 254
• Publication Date: 2014-11-20
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201403020
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Based on the integrated consideration and engineering of both conjugated backbones and flexible side chains, solution‐processable polymeric semiconductors consisting of a diketopyrrolopyrrole (DPP) backbone and a finely modulated branching side chain (<italic>ε</italic>‐branched chain) are reported. The subtle change in the branching point from the backbone alters the π−π stacking and the lamellar distances between polymer backbones, which has a significant influence on the charge‐transport properties and in turn the performances of field‐effect transistors (FETs). In addition to their excellent electron mobilities (up to 2.25 cm² V⁻¹ s⁻¹), ultra‐high hole mobilities (up to 12.25 cm² V⁻¹ s⁻¹) with an on/off ratio (<italic>I</italic>_on/<italic>I</italic>_off) of at least 10⁶ are achieved in the FETs fabricated using the polymers. The developed polymers exhibit extraordinarily high electrical performance with both hole and electron mobilities superior to that of unipolar amorphous silicon.</p> </abstract>