Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Role of interfacial layer is very crucial for the fabrication of high efficient organic solar cells as they affect the open-circuit voltage of the device, provides selective contacts for charge transportation, and can act as optical spacers [1]. In the past, solution processed materials such as metal oxides and polymers like PFN have been successfully introduced as hole and electron blocking layers for organic solar cells [2]. However most of these materials have to be included as very thin layers to keep the fill factor of the solar cells high due to their poor conduction properties. For the industrial application such as printed OPV, new materials forming thicker layer without affecting device performance and robust solution processing are highly desirable.
In present work, we use intentional doping of ZnO and TiO2 nanoparticles to modify electric properties of the electron extraction interlayers and study these interfacial layers in normal and inverted solar cell structure in combination with low band gap polymers such as PTB7. We investigate in detail the impact of the doping level of metal oxides on the performance of the two device structure (normal and inverted). We also studied charge carrier recombination kinetics at the Al cathode by transient open circuit decay measurements, a technique successfully applied to P3HT: PCBM solar cells recently [3].
[1] Steim, R.; Kogler, F. R.;Brabec, C. J. Interface materials for organic solar cells. J. Mater. Chem., 2010,20, 2499-2512. [2] Zhang, L.; He, C.; Chen, J.; Yuan, P.; Huang, L.; Zhang, C.; Cai, W.; Liu, Z.; Cao, Y. Bulk-Heterojunction Solar Cells with Benzotriazole-Based Copolymers as Electron Donors: Largely Improved Photovoltaic Parameters by Using PFN/Al Bilayer Cathode Macromolecules 2010, 43, 9771–9778. [3]Thakur, A. K.; Baboz,K.; Wantz,G.; Hodgkiss, J.; Hirsch, L. Relation between charge carrier density and lifetime in polymer-fullerene solar cells J. Appl. Phys. 2012, 112, 044502.
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