Conducting polymer-fullerene D-A photocell with decreased serial resistance: ITO/PAT(C60)y/C60/Al structure

Tada, Kazuya; Hidayat, Rahmat; Hirohata, Masaharu; Kawai, Tsuyoshi; Lee, S.B.; Bakhadirov, I.U.; Zakhidov, Anvar; Yoshino, Katsumi

doi:10.1016/s0379-6779(97)80266-4

Cited by 18 publications

(9 citation statements)

References 7 publications

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“…Qualitative similar behavior was found for bulk heterojunction diodes based on a soluble polythiophenes [107,111] instead of poly(para-phenylene vinylene)s. Several reasons can be given, why polythiophenes are potentially interesting materials for photovoltaic. First, the solubility of these polymers allows the formation of complex morphologies due to phase separation and supramolecular reorganization [112].…”

Section: Conjugated Polymer/c 60 Bulk Heterojunction Photodiodessupporting

confidence: 75%

Conjugated Polymer‐Based Plastic Solar Cells

Brabec

Sariçiftçi

1999

Semiconducting Polymers

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A tremendous research effort was devoted to the development of photovoltaic cells during the late seventies and early eighties. During this time interest was also devoted to the development of organic semiconductors, because they offer the advantages of low cost and facile processing. Organic materials for use in photovoltaic devices require a good chemical stability and large optical absorption in the visible range. For this purpose the first studied compounds were merocyanines [1] and phthalocyanines [2], which can readily be deposited as a thin film on various even flexible substrates by vacuum evaporation. Power conversion efficiencies of such devices are about 1% for small size photovoltaic elements.It is indeed intriguing and economically advantageous to think of large area photovoltaic elements based on thin plastic films, cut from rolls and deployed on permanent structures and surfaces. In order to fulfil these low cost and large area requirements, cheap production technologies for large scale coating must be used together with low cost material. Polymer photovoltaic cells hold the potential for such low cost cells. The flexibility of chemical tailoring of desired properties, as well as the cheap technology already well developed for all kinds of plastic thin film applications, meet exactly the above mentioned demands for cheap photovoltaic device production. The mechanical flexibility of plastic materials is useful for all photovoltaic applications onto curved surfaces for indoor as well as outdoor applications.Efficiencies of the first polymeric solar cells, based on hole conducting conjugated polymers (mainly polyacetylene) were rather discouraging [3]. However, the breakthrough to higher efficiencies was achieved by switching to different classes of electron-donor type-conjugated polymers (polythiophenes (PT), poly(para-phenylene vinylene)s (PPV) and their derivatives) and by mixing them with suitable electron acceptors [4]. Prototypes of photovoltaic devices based on a polymeric donor/acceptor networks showed solar energy conversion efficiencies of around 1% [5]. In particular, the photovoltaic properties and the photophysics of conjugated polymer/fullerene solid composites have been well investigated over the last few years [6].Besides the necessity for improvement in efficiency, stability is another problem for all the applications of conjugated polymers. First experiences on conjuSemiconducting Polymers: Chemistry, Physics and Engineering. Edited by G. Hadziioannou and P. F. van Hutten

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Section: Conjugated Polymer/c 60 Bulk Heterojunction Photodiodessupporting

confidence: 75%

Conjugated Polymer‐Based Plastic Solar Cells

Brabec

Sariçiftçi

1999

Semiconducting Polymers

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“…[1][2][3][4][5][6][7][8][9][10][11][12] The possibility of utilizing this effect for photovoltaic energy conversion, 5,8,[13][14][15][16][17] as well as for nonlinear optical devices such as optical limiters and transient holographic systems, has been demonstrated. [18][19][20][21] The photoinduced forward electron transfer occurs within a picosecond time scale 22,23 and the charge-separated state is long lived ͑milliseconds at 80 K͒.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced charge carriers in conjugated polymer–fullerene composites studied with light-induced electron-spin resonance

et al. 1999

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Photoinduced charge carriers in conjugated polymer-fullerene composites studied with lightinduced electron-spin resonance Dyakonov, V.; Zoriniants, G.; Scharber, M.C.; Brabec, C.J.; Janssen, R.A.J.; Hummelen, Jan Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Detailed studies on photoinduced spins in conjugated polymer/fullerene composites using ͑cw͒ light-induced electron-spin-resonance ͑LESR͒ technique are reported. Two overlapping LESR lines are observed, from positive polarons on the polymer chains and negative charges on the fullerene moieties. Microwave power saturation studies show different relaxation times for these two spins, ruling out spin-exchange correlations, giving clear evidence of independent spins. The unusually high relaxation rate of the fullerene monoanionic spins is of intrinsic origin, and discussed in terms of a splitting of the T 1u level by a Jahn-Teller-type distortion as proposed in the literature. Further, we observed two distinct contributions to LESR signals: a prompt one and a persistent one. The excitation light intensity dependence of the prompt contributions into the P ϩ and C 60 Ϫ ESR signals is of bimolecular type (I 0.5

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“…This very efficient charge separation has been utilized in polymeric photovoltaic devices. [5][6][7][8][9][10][11] Photoexcitation of oligothiophenes in liquid or solid solutions across the π-π* energy gap produces a metastable triplet state by intersystem crossing from the excited singlet manifold. [12][13][14][15][16][17] These triplet states were identified by their dipole allowed T 1 -T 2 transition, which exhibit a red shift with increasing chain length.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Charge Transfer between Tetracyano-Anthraquino-Dimethane Derivatives and Conjugated Polymers for Photovoltaics

Zerza¹,

Scharber²,

Brabec³

et al. 2000

J. Phys. Chem. A

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The photoinduced charge transfer between tetracyano-anthraquino-dimethane (TCAQ) derivatives and poly-[2-methoxy-5-(3,7-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) has been studied by photoinduced absorption (PIA) spectroscopy in the VIS and IR spectral region and by light induced electron spin resonance (LESR). Studies on three different TCAQ derivatives with different side chain substitutions are reported. Among them a supermolecule with TCAQ attached to a fullerene have been synthesized to serve as tandem electron acceptor. The photoinduced absorption in the Vis/near-IR range shows a broad plateau around 1.8 eV followed by two peaks at 1.35 and 1.24 eV with an additional broad feature below 0.5 eV for all three acceptors in composite with MDMO-PPV. All PIA features have a power law excitation intensity dependence with an exponent close to 0.5 as expected for bimolecular kinetics. LESR studies show one absorption at a g-factor of 2.0028 with a width (peak-to-peak) of 3.5 G, originating from TCAQ anion radical and the polymer cation radical. Evidence for the formation of a C 60 anion was found in the case of electron transfer from the MDMO-PPV polymer to the TCAQ-C 60 acceptor dyade from these LESR studies. Finally bulk-heterojunction type thin film structures of MDMO-PPV as donor and the TCAQ derivatives as acceptor have been fabricated and tested as photovoltaic devices.

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Conducting polymer-fullerene D-A photocell with decreased serial resistance: ITO/PAT(C60)y/C60/Al structure

Cited by 18 publications

References 7 publications

Conjugated Polymer‐Based Plastic Solar Cells

Conjugated Polymer‐Based Plastic Solar Cells

Photoinduced charge carriers in conjugated polymer–fullerene composites studied with light-induced electron-spin resonance

Photoinduced Charge Transfer between Tetracyano-Anthraquino-Dimethane Derivatives and Conjugated Polymers for Photovoltaics

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