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Author

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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Easily Attainable Phenothiazine-Based Polymers for Polymer Solar Cells: Advantage of Insertion of S,S-dioxides into its Polymer for Inverted Structure Solar Cells

Cited 18 times inthomson ciCited 18 times inthomson ci
Title
Easily Attainable Phenothiazine-Based Polymers for Polymer Solar Cells: Advantage of Insertion of S,S-dioxides into its Polymer for Inverted Structure Solar Cells
Author
Kim, GyoungsikYeom, Hye RimCho, ShinukSeo, Jung HwaKim, Jin YoungYang, Changduk
Keywords
Benzothiadiazoles; Building blockes; Coplanarity; Electron-deficient; Electronic application; Heterocycles; Intermolecular interactions; Inverted structure; Molecular characteristics; Molecular energy levels; Nitrogen-Sulfur; P-type; Polymer semiconductors; Polymer Solar Cells; Polymeric solar cells; Positive features; Power conversion efficiencies; Red-shifted; Sulfonyl groups; Theoretical calculations; UV-vis absorptions
Issue Date
201202
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.45, no.4, pp.1847 - 1857
Abstract
Two donor- (D-) acceptor (A) type polymers based on a soluble chromophore of phenothiazine (PT) unit that is a tricyclic nitrogen-sulfur heterocycle, have been synthesized by introducing an electron-deficient benzothiadiazole (BT) building block copolymerized with either PT or phenothiazine-S,S-dioxide (PT-SS) unit as an oxidized form of PT. The resulting polymers, PPTDTBT and PPTDTBT-SS are fully characterized by UV-vis absorption, electrochemical cyclic voltammetry, Xray diffraction (XRD), and DFT theoretical calculations. We find that the maximum absorption of PPTDTBT is not only markedly red-shifted with respect to that of PPTDTBT-SS but also its band gap as well as molecular energy levels are readily tuned by the insertion of S,S-dioxides into the polymer. The main interest is focused on the electronic applications of the two polymers in organic field-effect transistors (OFETs) as well as conventional and inverted polymeric solar cells (PSCs). PPTDTBT is a typical p-type polymer semiconductor for OFETs and conventional PSCs based on this polymer and PC71BM show a power conversion efficiency (PCE) of 1.69%. In case of PPTDTBT-SS, the devices characteristics result in: (i) 1 order of magnitude higher hole mobility (mu = 6.9 x 10(-4) cm(2) V-1 s(-1)) than that obtained with PPTDTBT and (ii) improved performance of the inverted PSCs (1.22%), compared to its conventional devices. Such positive features can be accounted for in terms of closer packing molecular characteristics owing either to the effects of dipolar intermolecular interactions orientated from the sulfonyl groups or the relatively high coplanarity of PPTDTBT-SS backbone.
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DOI
http://dx.doi.org/10.1021/ma202661b
ISSN
0024-9297
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