Presentation	2013-11-22 Analysing of Limitting Factors in Organic Photovoltaic Devices Using Impedance Spectroscopy Ying CHAI, Ryuhei MURAYAMA, Hirotaka KOJIMA, Ryosuke MATSUBARA, Masakazu NAKAMURA,
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Abstract(in English)	For the purpose of effective energy harvesting in room ambient without making human eyes feel dark, wide HOMO-LUMO gap p-type materials, 2,7-Di[biphenyl]benzothieno[3,2-b]benzothiophene (DBPh-BTBT), and C_<60> fullerene was used for fabricating planar organic photovoltaic (OPV) devices. Device parameters, such as the open circuit voltage (V_), have been determined by measuring current density-voltage characteristics. Impedance spectroscopy has been also applied to the samples and the equivalent circuit constants have been extracted assuming that the each layer is regarded as a CR parallel circuit. Then, the dependence of the constants on the applied voltage has been investigated. As a result, the capacitance of the p-doped later, in which F_4TCNQ is doped as an acceptor material, was confirmed to be widely varied by the applied voltage. The reason why the becomes smaller than the energy difference between HOMO of the p-type and LUMO of the n-type materials was discussed based on the flat-band voltage for the p-doped layer.
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Keyword(in English)	Wide band gap organic semiconductor / Organic photovoltaic / Planar heterojunction / Impedance spectroscopy
Paper #	OME2013-71,OPE2013-132
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Committee	OME
Conference Date	2013/11/15(1days)
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Paper Information
Registration To	Organic Material Electronics (OME)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Analysing of Limitting Factors in Organic Photovoltaic Devices Using Impedance Spectroscopy
Sub Title (in English)
Keyword(1)	Wide band gap organic semiconductor
Keyword(2)	Organic photovoltaic
Keyword(3)	Planar heterojunction
Keyword(4)	Impedance spectroscopy
1st Author's Name	Ying CHAI
1st Author's Affiliation	Nara Institute of Science and Technology()
2nd Author's Name	Ryuhei MURAYAMA
2nd Author's Affiliation	Nara Institute of Science and Technology
3rd Author's Name	Hirotaka KOJIMA
3rd Author's Affiliation	Nara Institute of Science and Technology
4th Author's Name	Ryosuke MATSUBARA
4th Author's Affiliation	Nara Institute of Science and Technology
5th Author's Name	Masakazu NAKAMURA
5th Author's Affiliation	Nara Institute of Science and Technology
Date	2013-11-22
Paper #	OME2013-71,OPE2013-132
Volume (vol)	vol.113
Number (no)	312
Page	pp.pp.-
#Pages	5
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