Effects of photo-oxidation on the performance of poly [2-methoxy-5- (3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene]:[6,6]-phenyl C 61-butyric acid methyl ester solar cells

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Abstract

A study of the photo-oxidation of films of poly[2-methoxy-5-(3′, 7′-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) blended with [6,6]-phenyl C61-butyric acid methyl ester (PCBM), and solar cells based thereon, is presented. Solar-cell performance is degraded primarily through loss in short-circuit current density, JSC. The effect of the same photodegradation treatment on the optical-absorption, charge- recombination, and charge-transport properties of the active layer is studied. It is concluded that the loss in JSC is primarily due to a reduction in charge-carrier mobility, owing to the creation of more deep traps in the polymer during photo-oxidation. Recombination is slowed down by the degradation and cannot therefore explain the loss in photocurrent. Optical absorption is reduced by photo-bleaching, but the size of this effect alone is insufficient to explain the loss in device photocurrent. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Pacios, R., Chatten, A. J., Kawano, K., Durrant, J. R., Bradley, D. D. C., & Nelson, J. (2006). Effects of photo-oxidation on the performance of poly [2-methoxy-5- (3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene]:[6,6]-phenyl C 61-butyric acid methyl ester solar cells. Advanced Functional Materials, 16(16), 2117–2126. https://doi.org/10.1002/adfm.200500714

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