Presentation	2011-01-19 Temperature dependence of open-circuit voltage in organic photovoltaic devices and the influence of device structures Eiji ITOH, Kenta OKUHARA, Toshiki SHIROTORI,
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Abstract(in English)	We have investigated the temperature dependence of open circuit voltage (V_) in multi-layered and bulk-heterojunction organic photovoltaic devices. The V_ linearly increases with the ionization potential (IP) of donor materials in multi-layered device consisting of indium-tin-oxide (ITO)/(oxide)/donor/fullerene (C_<60>)/bathocuproine (BCP)/Al structure when IP of donor is relatively small. However, the V_ saturated at nearly 0.7V for the donor with high IP due to the relatively low work-function (WF) of ITO electrode. We have then inserted the transition metal oxide as a buffer layer in order to elevate the work-function of anode, which is effective to increase the V_ above 1 V. The Voc is also strongly dependent on the measured temperatures especially in multi-layered device with the donor with low IP, whereas the change in V_ is relatively small in bulk-heterojunction devices. We discussed the temperature dependence of the V_ related to the work-function difference of electrodes, charge recombination through the distribution of tail-states at the donor/acceptor interface.
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Keyword(in English)	Organic photovoltaic devices / the open-circuit voltage / ionization potential / work-function difference / temperature dependence
Paper #	OME2010-67
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Committee	OME
Conference Date	2011/1/12(1days)
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Registration To	Organic Material Electronics (OME)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Temperature dependence of open-circuit voltage in organic photovoltaic devices and the influence of device structures
Sub Title (in English)
Keyword(1)	Organic photovoltaic devices
Keyword(2)	the open-circuit voltage
Keyword(3)	ionization potential
Keyword(4)	work-function difference
Keyword(5)	temperature dependence
1st Author's Name	Eiji ITOH
1st Author's Affiliation	Faculty of Engineering, Shinshu University()
2nd Author's Name	Kenta OKUHARA
2nd Author's Affiliation	Shinshu University
3rd Author's Name	Toshiki SHIROTORI
3rd Author's Affiliation	Shinshu University
Date	2011-01-19
Paper #	OME2010-67
Volume (vol)	vol.110
Number (no)	365
Page	pp.pp.-
#Pages	5
Date of Issue