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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Benzodipyrrolidone (BDP)-based polymer semiconductors containing a series of chalcogen atoms: Comprehensive investigation of the effect of heteroaromatic blocks on intrinsic semiconducting properties

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Title
Benzodipyrrolidone (BDP)-based polymer semiconductors containing a series of chalcogen atoms: Comprehensive investigation of the effect of heteroaromatic blocks on intrinsic semiconducting properties
Author
Lee, Kyu CheolPark, Won-TaeNoh, Yong-YoungYang, Changduk
Issue Date
2014-04
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.6, no.7, pp.4872 - 4882
Abstract
In order to determine the effects of actual 'chalcogen atoms' on semiconducting properties for application in a variety of optoelectronic devices, a class of donor (D)-acceptor (A) polymer semiconductors, namely PBDP-Fu, PBDP-Th, and PBDP-Se, containing the recently formulated benzodipyrrolidone (BDP) accepting unit and furan (Fu), thiophene (Th), or selenophene (Se) as a donating unit has been synthesized, characterized, and used in an active layer of organic field-effect transistors (OFETs). With the LUMO levels being comparatively consistent for all three polymers (-3.58 to -3.60 eV) due to the dominant BDP contribution to the polymer backbone, the HOMO energies are somewhat sensitive to the structurally distinctive feature of the donor counits used. Utilizing a combination of X-ray diffraction (XRD) and atomic force microscopy (AFM), it is apparent that further crystalline domains occur with edge-on orientation for the polymers (PBDP-Th and PBDP-Se) with relatively heavier chalcogen atoms such as Th and Se, compared with PBDP-Fu which has a rather amorphous nature. Investigation of their OFET performance indicates that all the polymers show well balanced ambipolar operations. The desirable morphological structures of both the PBDP-Th and PBDP-Se result in higher mobilities in OFETs than those of PBDP-Fu. In particular, 200 °C annealed PBDP-Se OFETs results in ambipolarity being mobile for both holes of up to 1.7 × 10-2 cm2/V·s and electrodes of up to 1.9 × 10-2 cm2/V·s. In addition, OFETs with PBDP-Th show nearly equivalent charge carrier mobilities for both holes (μh = 1.2 × 10-2 cm2/V·s) and electrons (μe = 1.1 × 10-2 cm2/ V·s). Consequently, we systematically demonstrate how the manipulation of existing heteroaromatics can modulate the electronic properties of conjugated D-A polymers, elucidating structure-property relationships that are desirable for the rational design of next generation materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/4461
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84898467450
DOI
10.1021/am405917a
ISSN
1944-8244
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