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New Physical and Chemical Treatments to Improve the Quantum Efficiency in Polymer Solar Cells

Published online by Cambridge University Press:  01 February 2011

Osamu Yoshikawa ,
Taro Sonobe ,
Takashi Sagawa  and
Susumu Yoshikawa
Osamu Yoshikawa
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan
Taro Sonobe
Affiliation:
[email protected], Kyoto University, Research Institute for Sustainable Humanosphere, Gokasho, Uji, 611-0011, Japan
Takashi Sagawa
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan, +81774384580, +81774383508
Susumu Yoshikawa
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan
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Abstract

The performance of the devices of bulk heterojunction polymer-based solar cells were investigated by using poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl C61 butyric acid methyl ester (PCBM) as light absorption (viz. active) layer, with TiOx as interlayer as follows: ITO/PEDOT:PSS/P3HT-PCBM/TiOx/Al [1] through the treatment of microwave irradiation (single mode of 2.45 GHz, 800 W for 1, 2.5, or 5 min). Such treatments enabled to increase the short-circuit current density Jsc (from 4.53 mA cm−2 to 7.27 mA cm−2) and fill factor FF (from 0.41 to 0.66) of the cell, though the open circuit voltage Voc was decreased (from 0.61 V to 0.57 V) along the irradiation. Absorption spectra of P3HT-PCBM blended film before and after the microwave treatment were observed. Shoulders at 550 nm and 600 nm appeared after the irradiation. This result implies that the microcrystallization of P3HT was slightly promoted through the microwave treatment.

Keywords

photovoltaicthin filmmicrowave heating
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1091: Symposium AA – Conjugated Organic Materials–Synthesis, Structure, Device and Applications , 2008 , 1091-AA05-65
Copyright
Copyright © Materials Research Society 2008

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