Electrochemical and optical studies of 1,4-diaminoanthraquinone for solar cell applications

Brovelli, Francisco; Rivas, B. L.; Bérnède, J.C.; Valle, M.; Díaz, F. R.; Berredjem, Y.

doi:10.1007/s00289-006-0686-0

Cited by 28 publications

(17 citation statements)

References 7 publications

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“…Therefore, in a first attempt to improve the efficiency of the cells a thin 1,4-DAAQ film has been introduced between CuPc and PTCDA. Indeed, from the measured HOMO and LUMO values of 1,4-DAAQ estimated by cyclic voltammetry [21] it can be seen in Fig. 3 that 1,4-DAAQ can be seen as an acceptor for CuPc and a donor for PTCDA.…”

Section: Resultsmentioning

confidence: 96%

The open circuit voltage of encapsulated plastic photovoltaic cells

et al. 2008

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Section: Resultsmentioning

confidence: 96%

The open circuit voltage of encapsulated plastic photovoltaic cells

et al. 2008

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“…6) and were calculated from the first peak of the corresponding redox wave (E 1 ox vs. Ag/AgCl) [38], according to the following equation.…”

Section: Physical Propertiesmentioning

confidence: 99%

Effect of triphenylamine as electron-donor evenly spaced in 2, 4, 6 and 8 thiophene units of the main chain: synthesis and properties

et al. 2015

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Several poly(thiophene) derivatives containing triphenylamine (TPA) as electron-donor were synthesized by chemical homopolymerization in CHCl 3 media using FeCl 3 as oxidizing agent. Monomers containing TPA bonded by imine groups to terminal thiophene, bithiophene, terthiophene units allows polymerization to be performed in conditions similar to thiophene. TPA units are regularly spaced in 2, 4, 6 and 8 thiophenyl units in the main chain. TPA electron-donor effect on the polymers chains, as compared to poly(thiophene) was studied. Polymers, labeled as poly(TPA-Th), poly(TPA-biTh) and poly(TPA-Terth) were characterized by 1 H-NMR, FT-IR and UV-visible spectroscopy, elemental analysis, thermal stability (TGA) intrinsic viscosity, differential scanning calorimetry (DSC) and electrochemically using cyclic voltammetry (CV). The characterizations are consistent with the proposed structures. The polymers exhibited different optical absorption.They exhibited low intrinsic viscosity, a different effective conjugation and high thermal stability. Moreover, the polymers displayed two redox processes with a redox potential lower than that of poly(thiophene). Highest Occupied Molecular Orbital (HOMO), Lowest Unoccupied Molecular Orbital (LUMO) and optical band gap (E g ) were measured and the obtained values were compared with those of poly(thiophene). The effect of the presence of TPA units in the thiophenyl chains on HOMO, LUMO, band gap, redox potential and on TGA is reported. To complete the series, HOMO/LUMO levels and band gap of a polymer containing TPA with 8 thiophenyl units in the chain were determined using theoretical calculations. The results proved that, with respect to poly(thiophene), it is possible to decrease HOMO and LUMO without changing the band gap, projecting itself as a potential polymer to be studied in organic photocells.

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“…The potential difference Eg = LUMO -HOMO can be used to estimate the energy gap of the dye. The energy level of the normal hydrogen electrode (NHE) is situated 4.5 eV below the zero vacuum energy level As an example the curves corresponding to 1.4 Dioaminoanthraquinone (1.4-DAAQ) are presented in fig 23 [136].…”

Section: Electrochemicalmentioning

confidence: 99%

Organic Photovoltaic Cells: History, Principle and Techniques

Bérnède

2008

J. Chil. Chem. Soc.

147

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In this review we present an overview of the different organic solar cells families. After recalling shortly the specificities of organic materials, the band structure, the electronic properties and the charge separation process in organic materials are shortly described. Then the new organic solar cell concepts are presented. Plastic organic solar cells consist either of two organic layers or a homogeneous mixture of two organic materials. One of them -either an organic dye or a semiconducting polymer -donates the electrons. The other component serves as the electron acceptor. Principles of these multi-layers and bulk heterojunctions are presented and discussed. Then some typical examples are presented, showing the fast evolution of the cells performances. Finally, a specific attention is devoted to the interfaces electrodes/organics. Indeed recent results show that, at least in the case of multi-layers cells, the introduction of thin buffer layers at the interfaces cathode/organic acceptor and/or anode/organic donor, can strongly improve the efficiency of the organic solar cells. About the interface organic acceptor/cathode, we report the influence of an exciton-blocking layer and/or an Al 2 O 3 thin layer on the efficiency of CuPc/C 60 based photovoltaic cells. The presence, or not, of a thin Al 2 O 3 layer depends on the encapsulating process of the devices. In the case of glass/ITO/CuPc/C 60 /Al cells, the presence of an Al 2 O 3 thin layer at the interface "organic acceptor/aluminium" increases strongly the open circuit voltage of the cells but decreases slightly their short circuit current and fill factor. In the case of glass/ITO/CuPc/C 60 /Alq 3 /Al cells, the open circuit voltage is systematically higher than without Alq 3 . However, in that case, the presence of Al 2 O 3 does not improve significantly the cell performances. All these results are discussed in terms of series and shunt resistance values related to possible oxygen contamination and organic covalent action with the Al films. The effectiveness of these different phenomena depends on the presence, or not, of Alq 3 and/or Al 2 O 3 layers.About the interface anode/organic donor, it is shown that an ultra thin metallic film improves significantly the short circuit current and the cell performances. The anode in plastic solar cells, which is a transparent conductive oxide (TCO), is usually an indium tin oxide film (ITO). Indeed, when a ZnO anode is used, cells performances are far from those achieved with ITO. However, strong improvement of the cells efficiency is encountered when an ultra thin buffer layer is introduced between the ZnO and the organic film. The presence of this ultra thin buffer layer at the surface of the TCO allows decreasing the performance difference between the cells using ITO and those using ZnO. More generally such ultra thin buffer layer improves the solar cells performances.

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Electrochemical and optical studies of 1,4-diaminoanthraquinone for solar cell applications

Cited by 28 publications

References 7 publications

The open circuit voltage of encapsulated plastic photovoltaic cells

The open circuit voltage of encapsulated plastic photovoltaic cells

Effect of triphenylamine as electron-donor evenly spaced in 2, 4, 6 and 8 thiophene units of the main chain: synthesis and properties

Organic Photovoltaic Cells: History, Principle and Techniques

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