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  • Rusop Mahmood, Mohamad  (6)
  • Zahid, Fazlinashatul Suhaidah  (6)
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  • 1
    Online Resource
    Online Resource
    Effect of Iodine Concentration in MWCNTs for MEH-PPV Based Organic Solar Cell Applications
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 832 ( 2013-11), p. 681-686
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 832 ( 2013-11), p. 681-686
    Abstract: In general, Iodine doping concentration can affect the conductivity of the CNTs and explicitly the efficiency of organic solar cells. Iodine is a p-type dopant and when doped into MWCNTs it form an electron acceptor in the form of (I 3 ) - or (I 5 ) - . Therefore, electron transfer from Iodine to MWCNTs can generate free hole carriers. This free hole carriers is then collected by the electrodes. However, the generated free carriers depend on the concentration Iodine being used. It can be seen that as the concentration of Iodine increase from undope, 40 mg, 60 mg and 1 g, the I-MWCNTs are well dispersed in the polymer matrix. The results obtained reveal that the films are smooth as the concentration of Iodine increased. This shows that the agglomerations of the CNTs are less when there is more Iodine being doped with the CNTs. It can also be observed that as the Iodine concentration increased the film thickness decreased. In this work, the possibility to get efficiency with thickness of less than 60 nm is proved and the obtained efficiency with thickness about 51 nm at 1 g Iodine doping has been recorded with 8.01 x 10 -4 %.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.832
    DOI: 10.4028/www.scientific.net/AMR.832.681
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Optical Band Gap Decrement of Nanocomposited MEH-PPV:CNTs Thin Film for Organic Solar Cells
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 260-264
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 260-264
    Abstract: This work focus on optical band gap of nanocomposited MEH-PPV:CNTs thin film. In this research we investigate the behavior of optical band gap when the composition of CNTs powder is increased which directly influence the thickness of the thin film. The experimental process entailed for the black powder of CNTs to be first annealed at 450 °C before mixing it with the polymer solution to ensure that the impurities in the CNTs are all removed. The 20 mg MEH-PPV polymer was dissolved in an aromatic solvent which is toluene with a concentration of 1:1. The composite materials were prepared by adding appropriate amounts of CNTs powder (1, 2, 3 and 4 wt%) into the polymer solution to make various ratios of CNTs powder/polymer composites. The optical properties of the thin film were analyzed by using Perkin Elmer Lambda 750 UV/Vis Spectrometer. Thickness of the thin film is measured using Surface profiler Veeco Dektak 150. In this paper, the optical band gap energy is derived by assuming a direct transition of electron between the edge of the valence band and the conduction band. Our results demonstrates that as the thickness decrease from 62, 60, 59, 58 and 57 nm, the optical band gap showed slight decrement from 2.07, 2.07, 2.05, 2.01 and 2.00 eV for respectively.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.260
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Role of Thickness towards the Optical and Electrical Properties of Photoactive Layer MEH-PPV: TiO〈sub〉2〈/sub〉 Nanocomposite Thin Films
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 832 ( 2013-11), p. 404-409
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 832 ( 2013-11), p. 404-409
    Abstract: In recent years, the research on organic solar cells systems based on nanocomposite containing conjugated polymers has lead to great attention with the aim or replacing conventional inorganic solar cells. This nanocomposite can be processed at lower cost, low weight and ease of synthesis with greater versatility than todays solar cell. In this study, we investigated the dependence of physical, optical and electrical properties on the thickness of MEH-PPV: TiO 2 nanocomposite thin films for organic solar cell application. It was found the optical properties of photo-active layer MEH-PPV: TiO 2 nanocomposite thin films improved with increasing its thickness however the electrical properties decreased. The absorption coefficients of photoactive layer are high in the visible region (400-600 nm) with optimum absorption region at 500 nm. The shift of absorption edge toward longer wavelength with increased of nanocomposite photoactive layer thickness due to narrowing band gap caused by the effects of electron-electron and electron-impurity scattering. In addition the study of illuminated current-voltage (I-V) characteristics revealed the increment of recombination process with increased of photoactive layer thicknesses. It was found such increased in resistivity from 136x10 3 to 1600x10 3 Ω.cm is closely related to the electric field and exciton dissociation which is decreased with increased photoactive thickness.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.832
    DOI: 10.4028/www.scientific.net/AMR.832.404
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Photovoltaic Characteristics of Hybrid MEH-PPV and TiO〈sub〉2〈/sub〉 Nanoparticle Based Organic Solar Cells
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 667 ( 2013-3), p. 300-306
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 667 ( 2013-3), p. 300-306
    Abstract: The photovoltaic properties of organic solar cells based on hybrid poly [2-methoxy-5-(2-ethylhexyloxy-p-phenylenevinylen) (MEH-PPV) and anatase titanium dioxide (TiO2) nanoparticles as a function of TiO2 concentration were investigated. Synthesis of TiO2 nanoparticles was performed by sol-gel immerses heated method and been used as a filler in MEH-PPV polymer matrix. The hybrid MEH-PPV: TiO2 solar cells exhibited increased in light absorption and power conversion efficiency than the pristine organic solar cell. By further optimizing the concentration of TiO2 nanoparticles, the short-circuit current of the hybrid MEH-PPV: TiO2 was reached up to 0.004823 (mA/cm2) and the corresponding power conversion efficiency was 0.000378% was obtained under Air Mass 1.5 illumination which was more than 80% higher compared to the device without TiO2 nanoparticles. This indicates by embedded TiO2 nanoparticles in MEH-PPV matrix encouraging the charge transportation in the active layer of organic solar cells device.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.667
    DOI: 10.4028/www.scientific.net/AMR.667.300
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Electrical and Physical Properties of Nanocomposited MEH-PPV: CNTs for Organic Solar Cells Application
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 832 ( 2013-11), p. 687-690
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 832 ( 2013-11), p. 687-690
    Abstract: This paper discussed the physical and electrical properties of annealed and non-annealed CNTs in nanocomposited MEH-PPV:CNTs. By comparing these two types of CNTs, it is proven that annealed CNTs showed improvement in both properties compared to the non-annealed CNTs. The main improvement related to the physical properties from one aspect, influence the electrical of the nanocomposited MEH-PPV:CNTs thin film. The non-annealed CNTs with diameter size 8-9 nm is lessen to 5-6 nm after annealing. The photo conductivity increased from 11.2 x 10 -3 S/m to 22.9 x 10 -3 S/m.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.832
    DOI: 10.4028/www.scientific.net/AMR.832.687
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Influence of Cathode Work Functions on the Photovoltaic Properties of MEH-PPV: TiO〈sub〉2〈/sub〉 Bulk Heterojunction Solar Cell
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 832 ( 2013-11), p. 399-403
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 832 ( 2013-11), p. 399-403
    Abstract: Bulk heterojunction solar cell has received significant attention over the past decade due to low cost power generation and the potential to develop a clean renewable energy source [. We investigated the effect of different type of metal cathodes on the power conversion efficiency of bulk heterojunction solar cell based on a blend of conjugated polymer poly [2-methoxy 5-(2-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) with titanium dioxide (TiO 2 ). In this case of study, Aluminum (Al) and gold (Au) has been chosen as the metal cathode due to the difference of work function and their wide application in hybrid solar cell. We show that the choice of metal cathode plays a role in determining overall device efficiency through their impact on short-circuit current, open circuit voltage and fill factor due to the influence of work function. It is found that the device employing Al metal cathode which has low work function is showing a comparable performance to the Au metal electrode with fill factor of over 20 % and a power conversion efficiency of 3.3x10 -3 %. Overall it is demonstrated that the matching between the work function of the cathode and photoactive layer MEH-PPV: TiO 2 is the most important factor towards best bulk heterojunction solar cell performance.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.832
    DOI: 10.4028/www.scientific.net/AMR.832.399
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
    Location Call Number Limitation Availability
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    Online Resource
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