Organic–inorganic hybrid solar cells based on conducting polymer and SnO2 nanoparticles chemically modified with a fullerene derivative

Kudo, Naomi; Shimazaki, Yuta; Ohkita, Hideo; Ohoka, Masataka; Ito, Shinzaburo

doi:10.1016/j.solmat.2006.11.019

Cited by 58 publications

(27 citation statements)

References 20 publications

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“…For discussing this result, a diagram of the energy level alignment through the whole heterostructure of MDMO-PPV based OLEDs with silver cathode is depicted in figure 7. This diagram considers ITO as a degenerated semiconductor (4,6) and is based on the reported values of ITO bandgap 7, ITO work function (8), PEDOT:PSS ionization potential (9), PEDOT bandgap (10), MDMO-PPV bandgap (11), MDMO-PPV ionization potential (12), and the work function of silver and aluminum (13). This diagram assumes a vacuum level alignment; nevertheless dipole formation at organic / inorganic interfaces does affect the energy level alignment and carrier injection.…”

Section: Resultsmentioning

confidence: 99%

Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating.

et al. 2010

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Polymer-based organic light-emitting diodes (OLEDs) with the structure ITO / PEDOT:PSS / MDMO-PPV / Metal were prepared by spin coating. It is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the deposition parameters of the polymer electroluminescent layer MDMO-PPV. Objective. In this work the effect of i) the frequency of the spin coater (1000-8000 rpm), ii) the concentration of the MDMO-PPV: Toluene solution, and iii) the material used as cathode (Aluminium or Silver) on the electrical response of the devices, was evaluated through current-voltage (I-V) measurements. Materials and methods. PEDOT:PPS and MDMO-PPV organic layers were deposited by spin coating on ITO substrates, and the OLED structure was completed with cathodes of aluminium and silver. The electric response of the devices was evaluated based on the I-V characteristics. Results. Diodes prepared with thinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater or by using concentrations of MDMO-PPV: Toluene lower than 2% weight. A fit of the experimental data showed that the diodes have two contributions to the current. The first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel current through the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. Conclusions. The results fitting and the energy level alignment through the whole structure show that PPV-based OLEDs are unipolar devices, with current mainly attributed to hole transport. Key words: organic semiconductors, OLEDs, electroluminescent polymers, MDMO-PPV, PEDOT:PSS, Spin coating, HOMO, LUMO, carrier injection, thermionic emission.

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Section: Resultsmentioning

confidence: 99%

Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating.

et al. 2010

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“…SnO 2 is an n-type semiconductor crystal with direct band gap (3.7 eV) having high excitonic binding energy (130 eV). SnO 2 has been applied in many applications such as heat mirror, solar cell, gas sensors, and transparent conducting coating of glass [17][18][19]. SnO 2 nanostructure can be fabricated using different methods such as: ion sputtering, thermal evaporation, surfactants mediate, sol-gel and reverse cell [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, photocatalytic and antimicrobial properties of SnO2, SnS2 and SnO2/SnS2 nanostructure

Fakhri

Behrouz

Pourmand

2015

Journal of Photochemistry and Photobiology B: Biology

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“…[7][8][9] The conductivity is achieved by doping, which generates solitons, 10,11 polarons, and bipolarons [11][12][13][14] along the conjugated chain. Doping gives rise to inhomogeneity and structural disorder (crosslinks, dead ends, etc.)…”

mentioning

confidence: 99%

Dielectric spectroscopy for probing the relaxation and charge transport in polypyrrole nanofibers

Banerjee¹,

Kumar²

2011

Journal of Applied Physics

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Conductivity relaxation and charge transport mechanisms in polypyrrole (PPy) nanofibers synthesized using a micellar polymerization technique with varying surfactant concentration has been investigated by dielectric relaxation spectroscopy. TEM micrographs depict that the increasing surfactant concentration leads to the reduction of the nanofiber diameter. X-ray diffraction studies show that domain length in the PPy nanofibers decreases with decreasing fiber diameter whereas the strain caused due to dislocations and point defects increases. The permittivity spectra reveal that the relaxation mechanism in PPy nanofibers are dominated by hopping of trapped charges. Two relaxation peaks in the impedance spectra are attributed to the two-phase structure in the PPy nanofibers; the lower frequency peak is ascribed to the phase of oxidized repeat units and the higher frequency peak to the reduced repeat units of PPy nanofibers. The occurrence of relaxation peaks at different frequencies in the impedance and modulus spectra indicates a non-Debye relaxation with a wide distribution of relaxation times. The ac conductivity has been interpreted as a power law of frequency. The decrease of the parameter s with increasing temperature indicates that correlated barrier hopping is the dominant charge transport mechanism. Existence of polarons as major charge carriers has been confirmed by the low values of polaron binding energy.

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Organic–inorganic hybrid solar cells based on conducting polymer and SnO2 nanoparticles chemically modified with a fullerene derivative

Cited by 58 publications

References 20 publications

Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating.

Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating.

Synthesis, photocatalytic and antimicrobial properties of SnO2, SnS2 and SnO2/SnS2 nanostructure

Dielectric spectroscopy for probing the relaxation and charge transport in polypyrrole nanofibers

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