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


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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    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.
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    • "This value is higher than 70% of optimal EQE of the single-junction PCDTBT:PC 70 BM solar cells (the data is not shown here), implying a high charge-collection efficiency in tandem structure.The tandem PSCs with complementary absorption spectra was further explored using small band-gap PDPP3T to replace PCDTBT in rear sub-cell. Low band-gap PDPP3T was first developed for photovoltaic application by Janssen and his coworkers[42]. Ye et al. have further boosted the performance of PDPP3T-based solar cell by using ternary-solvent strategy to tune the BHJ morphology, enabling this polymer an efficient low band-gap donor for tandem cell application[43]. "
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    ABSTRACT: A highly transparent and physically robust step-Al-doped MoO3 layer was successfully utilized as the interconnection layer (ICL) to fabricate high-efficiency inverted tandem polymer solar cells (PSCs). The inverted tandem cell constructed by the same PCDTBT:PC70BM active layer showed a power conversion efficiency (PCE) of 6.88% with equivalent external quantum efficiency of nearly 80%, implying a high charge-collection efficiency in tandem structure. Incorporation of two sub-cells with complementary absorption spectra leads to further increase of PCE over 7.31%, which is the best results for tandem PSCs with PEDOT:PSS-free interconnection layer.
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    • "Other people have used chloroform, a low boiling point solvent, to process PDPP3T. However, the films spin coated on the ITO substrates did not spread well due to fast evaporation of chloroform [31]. Also, people have used binary to ternary solvents [32]. "
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    ABSTRACT: Using higher temperature without any additives, poly(diketopyrrolopyrrole-terthiophene) was successfully dissolved with PC60BM in a commonly used high-boiling point solvent namely chlorobenzene (CB). Use of CB allowed us to heat the blend solution at a higher temperature, which leads to improved nanoscale phase separation between donor and acceptor, which is important for an efficient exciton dissociation. Devices were fabricated in both regular and inverted bulk heterojunction structure for comparison by spin coating an active layer. Inverted structure solar cells exhibited higher power conversion efficiency than regular structure with significant improvement in current density, possibly attributed to increased light absorption in the active layer due to less parasitic absorption in the PEDOT:PSS and the Ca layer, which were used in normal structures. Furthermore, ultraviolet (UV) ozone treatment of ZnO film improved the solar cell performance. A UV ozone treatment of 5 min was found to be the optimal time resulting in the highest device efficiency (4.45%) with short circuit current density of 9.3 mA/cm(2), open circuit voltage of 0.69, and fill factor 69.5% without the need for any solvent additives.
    No preview · Article · May 2013 · IEEE Transactions on Electron Devices
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