Special Section on Organic Photovoltaics

Degradation mechanism of organic photovoltaic devices with bathocuproine buffer layer

[+] Author Affiliations
Chih-Chien Lee

National Taiwan University of Science and Technology, Department of Electronic Engineering, 43, Section 4, Keelung Road, Taipei, 106, Taiwan

Wei-Cheng Su

National Taiwan University of Science and Technology, Graduate Institute of Electro-Optical Engineering, 43, Section 4, Keelung Road, Taipei, 106, Taiwan

Jia-Cing Huang

National Taiwan University of Science and Technology, Department of Electronic Engineering, 43, Section 4, Keelung Road, Taipei, 106, Taiwan

Chi-Feng Lin

National Taiwan University, Graduate Institute of Photonics and Optoelectronics, 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan

Shun-Wei Liu

Academia Sinica, Institute of Chemistry, 128 Academia Road, Section 2, Nankang, Taipei 115, Taiwan

J. Photon. Energy. 1(1), 011108 (March 10, 2011). doi:10.1117/1.3555079
History: Received August 15, 2010; Revised December 10, 2010; Accepted January 20, 2011; Published March 10, 2011; Online March 10, 2011
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The degradation mechanism of pentacene/fullerene (C60)-based photovoltaic device is studied as a function of heating time. The efficiency of the device with bathocuproine (BCP) as buffer layer shows a considerable decay from 1.49 to 0.6% after 168-h heating, whereas the device without BCP possessed a stable performance under heating treatment. This decay is mainly caused by the poor thermal stability of BCP, which crystallized after the heating treatment and is discussed through the incident photon-to-electron conversion efficiency (IPCE) and the atomic force microscopic (AFM) measurements. The IPCE results indicated the redistribution of optical field due to the crystallization of BCP, and the AFM images showed the significant increase in surface root-mean-square value from 0.46 to 24.7 nm. Furthermore, the device without BCP exhibited the decrease in series resistance (Rs). The reduced Rs was attributed to the polycrystallized-like molecular arrangement after heating, which was confirmed by the Gaussian-disordered model.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Chih-Chien Lee ; Wei-Cheng Su ; Jia-Cing Huang ; Chi-Feng Lin and Shun-Wei Liu
"Degradation mechanism of organic photovoltaic devices with bathocuproine buffer layer", J. Photon. Energy. 1(1), 011108 (March 10, 2011). ; http://dx.doi.org/10.1117/1.3555079


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