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Characterization of Organic Solar Cells with a MoO3 Buffer Layer by Impedance Spectroscopy

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Impedance spectroscopy is a useful method for characterizing the electrical properties of materials and their interfaces. In this study we use impedance spectroscopy (IS) to investigate the degradation of the photovoltaic performance for aged organic solar cells (OSCs) with and without Molybdenum oxide (MoO3) anode buffer layer. The OSCs comprise a copper phthalocyanine (CuPc)/fullerene (C60) planar pn-heterojunction structure. A detailed analysis of the IS measurements yields information about a charge-blocking layer formed at the electrode/organic interface as devices are exposed to air, which can be effectively suppressed by the introduction of MoO3 buffer layer. The dynamics of charge injection and accumulation at the electrode/organic interface are further studied experimentally by the capacitance–voltage (CV) measurements in dark and under illumination. No significant increase in the capacitance under illumination is observed when MoO3 layer is inserted. This suggests that the photogenerated charge recombination at the anode contact is effectively decreased by ∼80%, consequently resulting in the better photovoltaic performance and operational stability of devices.
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Keywords: BUFFER LAYER; CAPACITANCE–VOLTAGE; IMPEDANCE; ORGANIC SOLAR CELLS

Document Type: Research Article

Publication date: August 1, 2017

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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