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MEH-PPV/Alq3-based bulk heterojunction photodetector |
Zubair Ahmada, Mahdi Hasan Suhailb, Issam Ibrahim Muhammadb, Wissam Khayer Al-Rawic, Khaulah Sulaimana, Qayyum Zafara, Ahmad Sazali Hamzahd, Zurina Shaamerid |
a Low Dimensional Materials Research Center, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia; b Department of Physics, College of Science, University of Baghdad, Iraq; c Department of Physics, College of Science, University of Anbar, Iraq; d Organic Synthesis Laboratory, Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam, Malaysia |
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Abstract In this paper, we present the effect of varied illumination levels on the electrical properties of the organic blend bulk heterojuction (BHJ) photodiode. To prepare the BHJ blend, poly(2-methoxy-5(2’-ethylhexyloxy) phenylenevinylene (MEH-PPV) and aluminum-tris-(8-hydroxyquinoline) (Alq3) are used as donor and acceptor materials, respectively. In order to fabricate the photodiode, a 40-nm thick film of poly(3, 4-ethylendioxythiophene):poly(styrensulfonate) (PEDOT:PSS) is primarily deposited on a cleaned ITO coated glass substrate by spin coating technique. The organic photosensitive blend is later spun coated on the PEDOT:PSS layer, followed by the lithium fluoride (LiF) and aluminium (Al) thin films deposition by thermal evaporation. The optical properties of the MEH-PPV:Alq3 blend thin films are investigated using photoluminescence (PL) and UV-Vis spectroscopy. The photodiode shows good photo-current response as a function of variable illumination levels. The responsivity value ~ 8 mA/W at 3 V is found and the ratio of photo-current to dark current (IPh/IDark) is found to be 1.24.
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Received: 04 February 2013
Revised: 19 April 2013
Accepted manuscript online:
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PACS:
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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42.79.Pw
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(Imaging detectors and sensors)
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42.70.Jk
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(Polymers and organics)
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81.05.Fb
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(Organic semiconductors)
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Fund: Project supported by the Long Term Research Grant Scheme (LRGS), Ministry of Higher Education, Malaysia (Grant No. LR003/2011A). |
Corresponding Authors:
Zubair Ahmad
E-mail: zubairtarar@um.edu.my
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Cite this article:
Zubair Ahmad, Mahdi Hasan Suhail, Issam Ibrahim Muhammad, Wissam Khayer Al-Rawi, Khaulah Sulaiman, Qayyum Zafar, Ahmad Sazali Hamzah, Zurina Shaameri MEH-PPV/Alq3-based bulk heterojunction photodetector 2013 Chin. Phys. B 22 100701
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