Role of Buckminsterfullerene, C60, in organic photoelectric devices

Sariciftci, Niyazi Serdar

doi:10.1016/0079-6727(94)00012-n

Cited by 120 publications

(50 citation statements)

References 81 publications

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“…Ultrafast light-induced charge transfer in a blend of a conjugated polymer and a fullerene derivative has been shown to yield long-lived charge carriers. 10 Power efficiencies over 2.5% under AM1.5 irradiation have been reported for plastic solar cells prepared using a blend of the conjugated polymer poly͓2-methoxy-5-(3Ј,7Ј-dimethyloctyloxy)-p-phenylene vinylene͔ ͑MDMO-PPV͒ and the fullerene derivative, ͓6,6͔-phenyl C 61 -butyric acid methyl ester ͑PCBM͒.…”

Section: Introductionmentioning

confidence: 99%

Mobility and decay kinetics of charge carriers in photoexcited PCBM/PPV blends

et al. 2004

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The transient photoconductivity of blends of a highly soluble C60 derivative ͑PCBM͒ and a dialkoxyphenylene-vinylene polymer ͑MDMO-PPV͒ has been studied using the electrodeless flash-photolysis timeresolved microwave conductivity technique ͑FP-TRMC͒. Films approximately 100 nm thick on a quartz substrate were prepared by spin-coating PCBM/PPV solutions with PCBM weight fractions (W PCBM ) from 0.2 to 0.95. For all blends, the wavelength dependence of the photoconductivity in the range 420-700 nm closely resembled the photon attenuation spectrum, indicating that photoexcitation of both components contributes to mobile charge carrier formation. The product of the quantum yield for charge separation and the sum of the charge carrier mobilities ⌺ was determined from the maximum ͑end-of-pulse͒ value of the transient photoconductivity. On excitation at 500 nm, ⌺ remained almost constant in going from W PCBM ϭ0.2 to 0.6 with an average value of 0.6ϫ10 Ϫ3 cm 2 /V s. Above W PCBM ϭ0.6, ⌺ increased dramatically, reaching a maximum value of 83ϫ10Ϫ3 cm 2 /V s for W PCBM ϭ0.85. This effect is attributed to the occurrence of phase separation above W PCBM ϭ0.6 and to the resulting formation of highly mobile electrons within PCBM-rich aggregates. The much lower value of ⌺ observed below W PCBM ϭ0.6 is assigned mainly to mobile holes within the polymer component of the blend. Possible explanations for the decrease in ⌺ with increasing light intensity, found for all blend compositions, are discussed.

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Section: Introductionmentioning

confidence: 99%

Mobility and decay kinetics of charge carriers in photoexcited PCBM/PPV blends

et al. 2004

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“…The carrier generation yield can be enhanced by the presence a͒ of a strong acceptor species, such as e.g., C 60 molecule. 9 The process of charge separation in polymer/fullerene composites is ultrafast, and can occur within 40 fs in PPV/PCBM composites, 10 whereas the electron back transfer is much slower. 9 This results in effective formation of a metastable charge-separated state.…”

Section: Introductionmentioning

confidence: 99%

“…9 The process of charge separation in polymer/fullerene composites is ultrafast, and can occur within 40 fs in PPV/PCBM composites, 10 whereas the electron back transfer is much slower. 9 This results in effective formation of a metastable charge-separated state. The photoinduced charge transfer is dependent upon the electronic overlap of the donor ͑D͒-acceptor ͑A͒ pair of molecules.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent characteristics of poly(3 hexylthiophene)-fullerene based heterojunction organic solar cells

Chirvase

Chiguvare

Knipper

et al. 2003

Journal of Applied Physics

269

156

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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. Electrical and optical properties of poly͑3-hexylthiophene-2.5diyl͒ ͑P3HT͒ used as the main component in a polymer/fullerene solar cell were studied. From the study of space-charge limited current behavior of indium-tin-oxide ͑ITO͒/P3HT/Au hole-only devices, the hole mobility and density were estimated to range from 1.4ϫ10 Ϫ6 cm 2 /V s and 5.3ϫ10 14 cm Ϫ3 at 150 K to 8.5 ϫ10 Ϫ5 cm 2 /V s and 1.1ϫ10 15 cm Ϫ3 at 250 K, respectively. The highest occupied to lowest occupied molecular orbital energetic difference was estimated from absorption spectrometry to be about 2.14 eV. Strong quenching of photoluminescence when the polymer was mixed with ͓6,6͔-phenyl-C 61 butyric acid methyl ester ͑PCBM͒, provided evidence of photoinduced charge transfer from P3HT to PCBM. Characterization of ITO/PEDOT:PSS/P3HT:PCBM/Al solar cells was done by analyzing the dependence of current density-voltage characteristics on temperature and illumination intensity. The main solar cell characteristics recorded at 300 K under 100 mW/cm 2 white-light intensity were: Open-circuit voltage 0.48 V, current density 1.28 mA/cm 2 , with an efficiency of 0.2%, and fill factor of 30.6%. Open-circuit voltage decreased almost linearly with increasing temperature, while short circuit current density increased with temperature, saturating at around 320 K, and decreased thereafter. Power conversion efficiency and fill factor were maximum around 3 mW/cm 2 due to the poor bulk transport properties of the active layer.

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“…Due to having high electron affinity, fullerenes have become the most widely used acceptor materials in organic solar cells and thus polymer -fullerene blends have received a particular interest from researchers. Photophysics of various conjugated polymer/C60 blends have been extensively studied and reported [98][99][100][101][102][103][104].…”

Section: Brief History and Recent Developments On Photovoltaic Energymentioning

confidence: 99%