Influence of ZnO: Al, MoO 3 and PEDOT: PSS on efficiency in standard and inverted polymer solar cells based on polyazomethine and poly (3-hexylthiophene).

Abstract

This paper is devoted to the development of standard and inverted polymer solar cells based on polyazomethine (PAZ-Car-TPA), poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM). We analyzed the influence of: (i) PEDOT:PSS or MoO3 as a hole transporting layer in standard devices, (ii) aluminum doping level (from 0 to 3.7%) in ZnO (obtained by atomic layer deposition, ALD) applied as an electron transporting layer in inverted solar cells and (iii) the method applied to obtain ZnO layer (ALD or sol-gel) on its photovoltaic properties.

The best device configuration is ITO/AZO (3% Al)/P3HT:PCBM/MoO3/Ag which exhibits a power conversion efficiency of 1.51% under about 100 mW/cm2 AM 1.5 G simulated solar emission. Devices were additionally tested by electrochemical impedance spectroscopy. HOMO-LUMO levels of PAZ-Car-TPA and its mixture with HCl, H2SO4, p-toluenesulfonic acid, PEDOT:PSS and water were analyzed by cyclic voltammetry and quantum mechanical calculations using Density Functional Theory method.

Citation

Iwan, A., Palewicz, M., Tazbir, I., Boharewicz, B., Pietruszka, R., Filapek, M., Wojtkiewicz, J., Witkowski, B.S., Granek, F. and Godlewski, M., 2016. Influence of ZnO: Al, MoO 3 and PEDOT: PSS on efficiency in standard and inverted polymer solar cells based on polyazomethine and poly (3-hexylthiophene). Electrochimica Acta, 191, pp.784-794.

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Categories: Solar & Photovoltaics

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