Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Perovskite solar cells in combination with organic hole transport materials have attracted attention due to their high power conversion efficiencies up to 15 %. Now that these high efficiencies were reached, it is important to address fundamental questions regarding the properties of the materials used. Here, we present a detailed study on important properties of the hole transport material for their successful application in perovskite solar cells. What is the influence of the molecular weight, the doping and the polarity of the material? A series of Poly(tetraphenylbenzidines) (PTPDs) with different molecular weights and polydispersities of was synthesized via Yamamoto polycondensation. Using space charge limited current (SCLC) measurements, we estimate that the hole transport mobility is independent of the investigated molecular weight and polydispersity range. The investigation of the doping with a Co(III) complex of the polymers reveals that the charge carrier density increases through an oxidation process which increases the density of charge carriers. Consequently, we find that the use of the Co(III) complex improves the photovoltaic performance of the perovskite solar cells involving PTPD. Finally, the variation of the polarity of the side chains of the PTPD leads to highly reproducible devices with less variance compared to the hydrophobic PTPD polymer.
Typical J-V-characteristics for the perovskite/PTPD devices with the hydrophilic PTPD at a simulated AM1.5G solar irradiation of 100 mW cm-2.
Neumann,K.; Schwarz,C.;Köhler, A,;Thelakkat, M. Influence of the Excited State Charge-Transfer Character on the Exciton Dissociation in Donor-Acceptor Copolymers, J.Phys.Chem.C (2013); DOI: 10.1021/jp407014q
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