Influence of ZnO:Al, MoO3 and PEDOT:PSS on efficiency in standard and inverted polymer solar cells based on polyazomethine and poly(3-hexylthiophene)

• Published in: Electrochimica acta Vol. 191; pp. 784 - 794
• Main Authors: Iwan, Agnieszka, Palewicz, Marcin, Tazbir, Igor, Boharewicz, Bartosz, Pietruszka, Rafal, Filapek, Michal, Wojtkiewicz, Jacek, Witkowski, Bartłomiej Sławomir, Granek, Filip, Godlewski, Marek
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 10-02-2016
• Subjects: Inverted polymer solar cells; P3HT; Polyazomethines; Protonation; ZnO:Al; Protonation; P3HT; Inverted polymer solar cells; ZnO:Al; Polyazomethines
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2016.01.107

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 100mW/cm2 AM 1.5G 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.