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Effect of annealing copper phthalocyanine on the performance of interdigitated bulk-heterojunction organic photovoltaic cells

Published online by Cambridge University Press:  09 May 2012

N.N. Wang ,
J.S. Yu ,
Z.L. Yuan  and
Y.D. Jiang
N.N. Wang
Affiliation:
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P.R. China
J.S. Yu*
Affiliation:
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P.R. China
Z.L. Yuan
Affiliation:
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P.R. China
Y.D. Jiang
Affiliation:
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, P.R. China
*
ae-mail: [email protected]
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Abstract

Organic photovoltaic (OPV) cells with improved efficiency using thermal annealing-induced nanostructured copper phthalocyanine as a donor layer were fabricated. A power conversion efficiency of 1.47% in the OPV cell with interdigitated CuPc/C60 bulk heterojunction has been obtained under AM 1.5 solar illumination at an intensity of 100 mW/cm2, which is higher than 0.63% of CuPc/C60 planar cell. Through varying the annealing temperature of CuPc films, the influence of interface morphology and crystallinity of CuPc films on the performance of OPV cells was systematically studied. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and spectrophotometry were used to characterize the CuPc films. The results showed that at an optimal annealing temperature, the crystalline nature and vertical orientation of nanostructured CuPc have been modified, which can facilitate the separation of interfacial electron-hole pairs and charge carrier transport to electrodes.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 58 , Issue 2 , May 2012 , 20201
Copyright
© EDP Sciences, 2012

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