Progress in stability of organic solar cells exposed to air |
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Authors: | Mohammad Tavakkoli Rasul Ajeian Moosa Nakhaee BadrabadiSaeed Saleh Ardestani Sayid Mohammad Hasan FeizKomeil Elahi Nasab |
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Affiliation: | a Thin Film Laboratory, School of Physics, Iran University of Science and Technology (IUST), Narmak 16846, Tehran, Iran b Department of Physics, Faculty of Sciences, University of Isfahan, Hezar Jerib Avenue, Isfahan 81746-73441, Iran |
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Abstract: | In this paper, the stability of small-molecule organic solar cells based on copper phthalocyanine (CuPc) and fullerene (C60) is investigated. The use of silver instead of aluminum as the metal electrode in these solar cells, with smaller grain size and grain boundaries as well as with more uniform grain size distribution in the film, results in significant improvement in the lifetime of the devices. The substantial role of silver in the protection of the cells against permeation of oxygen and/or water molecules into the organic thin films is confirmed. Substitution of a thin buffer layer (70 Å) of bathophenanthroline (Bphen) for bathocuproine (BCP), sandwiched between C60 and the cathode, makes considerable progress in the lifetime of the device. |
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Keywords: | Organic solar cells Stability BCP Bphen |
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