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Issue 39, 2011
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Enhanced performance and stability of inverted organic solar cells by using novel zinc-benzothiazole complexes as anode buffer layers

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Abstract

Performance of inverted bulk-heterojunction solar cells with widely used tris(8-quinolinolate)aluminium(III) (Alq3) is compared with a series of novel zinc-benzothiazole (Znb2) derivatives as buffer layer. The devices including a Znb2 thin layer between the poly(3-hexylthiophene) (P3HT):C61-butyric acid methyl ester (PCBM) blend and the Au anode show a significant improvement in the power conversion efficiency (η), which is enhanced by 30% compared to Alq3cells. Moreover, by combining both Alq3 and Znb2 in the device as a double buffer layer prior to the metal electrode deposition, the efficiency improves by 40%. The reasons for the enhanced performance of Znb2 cells are attributed to the efficient charge transport and electron/exciton blocking properties. Furthermore it is expected that the deposition of Znb2 modifies the Au work function to facilitate the hole transport and collection at the anode, and encapsulate the P3HT/PCBM blend during the electrode deposition. The presented photovoltaic cells also show high stability in ambient air conditions over a period of 245 days, which evidences the need of Znb2 buffer layers for long-term device durability.

Graphical abstract: Enhanced performance and stability of inverted organic solar cells by using novel zinc-benzothiazole complexes as anode buffer layers

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Publication details

The article was received on 12 Jul 2011, accepted on 03 Aug 2011 and first published on 26 Aug 2011


Article type: Paper
DOI: 10.1039/C1JM13256C
Citation: J. Mater. Chem., 2011,21, 15587-15592

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    Enhanced performance and stability of inverted organic solar cells by using novel zinc-benzothiazole complexes as anode buffer layers

    S. Dey, P. Vivo, A. Efimov and H. Lemmetyinen, J. Mater. Chem., 2011, 21, 15587
    DOI: 10.1039/C1JM13256C

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