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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/9844

Title: Increase in open-circuit voltage and improved stability of organic solar cells by inserting a molybdenum trioxide buffer layer
Authors: Murata, Hideyuki
Kinoshita, Yoshiki
Kanai, Yoshihiro
Matsushima, Toshinori
Ishii, Yuya
Keywords: 5,10,15,20-tetraphenylporphyrine
Molybdenum Trioxide
Organic Solar Cells
open-circuit voltage
power conversion efficiency
Issue Date: 2009
Publisher: Materials Research Society
Magazine name: Materials Research Society Symposium Proceedings
Volume: 1154
Start page: 1154-B10-73
Abstract: We report an increase in open-circuit voltage (V_<oc>) by inserting an MoO_3 layer on ITO substrate to improve built-in potential of organic solar cells (OSCs). In the OSCs using 5,10,15,20-tetraphenylporphyrine (H_2TPP) as p-type material and C_<60> as n-type material, the V_<oc> effectively increased from 0.57 to 0.97 V with increasing MoO_3 thickness. The obtained highest V_<oc> (0.97 V) is consistent with the theoretical value estimated from the energy difference between the LUMO (-4.50 eV) of C_<60> and the HOMO (-5.50 eV) of H_2TPP layer. Importantly, the enhancement in the V_<oc> was achieved without affecting the short-circuit current density (J_<sc>) and the fill-factor (FF). Thus, the power conversion efficiency of the device increased linearly from 1.24% to 1.88%. We also demonstrated that a MoO_3 buffer layer enhances the stability of OSCs after photo-irradiation. We have investigated the stability of OSCs using H_2TPP and N,N’-di(1-naphthyl)-N,N’-diphenylbenzidine as p-type layer. Both devices with MoO_3 layer showed improved stability. These results clearly suggest that the interface between ITO and p-type layeraffects device stability.
Rights: Copyright (C) 2009 Materials Research Society. It is posted here by permission of the Materials Research Society. Hideyuki Murata, Yoshiki Kinoshita, Yoshihiro Kanai, Toshinori Matsushima and Yuya Ishii, Materials Research Society Symposium Proceedings, 1154, 2009, 1154-B10-73. http://www.mrs.org/
URI: http://hdl.handle.net/10119/9844
Material Type: publisher
Appears in Collections:c11-1. 会議発表論文 (Conference Papers)

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