We report on the synthesis and characterization of conjugated aromatic phosphonic and carboxylic acids, that when attached to the surface of quantum dots and electrode surfaces, can have a profound effect on the resultant optoelectronic properties such as bandgaps and workfunctions(1). It was determined that the direction and magnitude of the molecular dipole moments of the acids can be related to the eventual changes in the quantum dot and electrode properties. For example, we are able to demonstrate the tuning of ZnO and ITO electrodes by 1eV in either direction (2eV range) depending on the acid attached to the surface (2,3). Similar effects will be reported on other electrodes and quantum dots. 1. Braid, J., Cowan, S., MacLeod, B., Koldemir, U., Sellinger, A., Collins, R., ... & Olson, D. Effect of conjugation linkage in molecular dipolar phosphonic acids for modification of zinc oxide in organic photovoltaics. Bulletin of the A. Phys. Soc. 2014 2. Ratcliff, E. L., Garcia, A., Paniagua, S. A., Cowan, S. R., Giordano, A. J., Ginley, D. S., Marder, S. R., Berry, J. J. and Olson, D. C. , Investigating the Influence of Interfacial Contact Properties on Open Circuit Voltages in Organic Photovoltaic Performance: Work Function Versus Selectivity. Adv. Energy Mater., 2013 3, 647–656. 3. Li, Hong, Pavel Paramonov, and Jean-Luc Bredas, Theoretical study of the surface modification of indium tin oxide with trifluorophenyl phosphonic acid molecules: impact of coverage density and binding geometry. J. Mat. Chem. 2010 20, 13, 2630-2637.

Modifying the bandgap of ITO and ZnO by 2eV using novel conjugated aromatic phosphonic and carboxylic acid ligands

249th National Meeting (2015)

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