Article

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: 11.44). 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.

Download full-text

Full-text

Available from: Martijn Wienk, Jun 29, 2015
1 Follower
 · 
397 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Two new acceptor–donor–acceptor (A–D–A) type small molecules DCAO3TIDT and DCNR3TIDT, with 4,4,9,9-tetrakis(4-(dodecyloxy)phenyl)-4,9-dihydro-s-indaceno-[1,2-b:5,6-b′]dithiophene (IDT) as the core group and 2-ethylhexyl cyanoacetate (CAO) and 2-(1,1-dicyanomethylene)-3-octyl rhodanine (CNR) as different end-capped blocks, have been designed and synthesized. Both of them have been employed as donor for solution-processed bulk hetero-junction (BHJ) organic solar cells (OSCs). The two compounds showed deep highest occupied molecular orbital (HOMO) energy levels (∼−5.30 eV) and strong absorption. The DCAO3TIDT and DCNR3TIDT with PC71BM as acceptor based BHJ solar cell devices showed short circuit current density (Jsc) of 6.93 mA/cm2 and 8.59 mA/cm2, power conversion efficiency (PCE) of 3.34% and 4.27%, respectively, and with almost same open-circuit voltage (∼0.93 V), under the illumination of AM 1.5 G, 100 mW/cm2. The high Jsc for DCNR3TIDT could result from its wider and red-shifted absorption than that of DCAO3TIDT, which was probably induced by the end-capped block rhodanine derivative. The results demonstrate that the end group would be taken into full account when designing new solution-processed small molecules, which is an important factor to determine their photovoltaic properties.
    Organic Electronics 01/2015; 17. DOI:10.1016/j.orgel.2014.12.031 · 3.68 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Eliminating processing with halogenated solvents is desirable to achieve sustainable large-scale fabrication of organic solar cells. This work demonstrates a device processing approach completely free of halogenated solvents to yield high-performance (power conversion efficiency, ηP > 6%) polymer:fullerene bulk-heterojunction solar cells comprising a conjugated polymer PIDT-phanQ and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). Introducing 2% 1-methylnaphthalene (Me-naph) as a processing additive to toluene alleviates PC71BM solubility problems, reduces phase domain size by two orders of magnitude, and boosts efficiency from ηP = 0.02% to 6.10%. Both AFM and TEM imaging show that the Me-naph additive promotes a more finely phase-separated morphology in spin-coated films, while photoluminescence quenching and photoinduced absorption spectroscopy confirm that this finer morphology results in both better exciton quenching and more efficient charge separation.
    Organic Electronics 12/2012; 13(12):2870–2878. DOI:10.1016/j.orgel.2012.08.026 · 3.68 Impact Factor
  • Source
    Solar Cells - New Aspects and Solutions, 11/2011; , ISBN: 978-953-307-761-1