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Journal of Photonics for Energy • Open Access

Degradation mechanism of organic photovoltaic devices with bathocuproine buffer layer
Author(s): Chih-Chien Lee; Wei-Cheng Su; Jia-Cing Huang; Chi-Feng Lin; Shun-Wei Liu

Paper Abstract

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.

Paper Details

Date Published: 1 January 2011
PDF: 9 pages
J. Photon. Energy 1(1) 011108 doi: 10.1117/1.3555079
Published in: Journal of Photonics for Energy Volume 1, Issue 1
Show Author Affiliations
Chih-Chien Lee, National Taiwan Univ. of Science and Technology (Taiwan)
Wei-Cheng Su, National Taiwan Univ. of Science and Technology (Taiwan)
Jia-Cing Huang, National Taiwan Univ. of Science and Technology (Taiwan)
Chi-Feng Lin, National Taiwan Univ. (Taiwan)
Shun-Wei Liu, Academia Sinica (Taiwan)

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