Poly(diketopyrrolopyrrole-terthiophene) for Ambipolar Logic and Photovoltaics

Molecular Materials and Nanosystems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Journal of the American Chemical Society (Impact Factor: 12.11). 11/2009; 131(46):16616-7. DOI: 10.1021/ja907506r
Source: PubMed

ABSTRACT A new semiconducting polymer, PDPP3T, with alternating diketopyrrolopyrrole and terthiophene units is presented. PDPP3T has a small band gap of 1.3 eV and exhibits nearly balanced hole and electron mobilities of 0.04 and 0.01 cm(2) V(-1) s(-1), respectively, in field-effect transistors (FETs). By the combination of two identical ambipolar transistors, an inverter was constructed that exhibits a gain of approximately 30. When PDPP3T was combined with [60]PCBM or [70]PCBM in a 1:2 weight ratio, photovoltaic cells were made that provide a photoresponse up to 900 nm and an AM1.5 power conversion efficiency of 3.8 or 4.7%, respectively. In contrast to the almost constant FET mobility, the efficiency of the photovoltaic cells was found to be strongly dependent on the molecular weight of PDPP3T and the use of diiodooctane as a processing agent.

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    • "Cyclic voltammetry (CV) has been widely employed to investigate the electrochemical behavior of the molecules and estimate their HOMO and LUMO energy levels [41] [42]. As shown in Fig. 3, only oxidation potentials were recorded for the two molecules. "
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    • "Meanwhile, this structural adjustment should result in tunable band gap, energy levels, and molecular packing. Therefore, DPP-containing polymers show wide application prospect in the field of organic photovoltaics [7, 8], electroluminescence device [9, 10], organic field-effect transistors [11, 12], and logic circuits [13, 14]. Recently, electronic, physical, and transistor properties of a family of donor-acceptor polymers (which consist of DPP coupled with neutral benzene (B), the weakly accepting benzothiadiazole (BT) and the strongly accepting benzobisthiadiazole (BBT)) have been experimented [15]. "
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    • "Among several morphological optimization methods, manipulation of the solvent composition has been a popular strategy [34] [35]. Specifically, adding a small fraction of a secondary liquid additive into the regular solvent has successfully improved the performance of many devices [36] [37] [38] [39] [40] [41]. The origin of the improved device performance and the relationship between solvent additive and blend morphology are current areas of intense research. "
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