Surface charge measurements and (dis)charging dynamics of organic semiconductors in various media using optical tweezers

Rebecca R. Grollman; Kyle Peters; Oksana Ostroverkhova

doi:10.1117/12.2040278

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7 March 2014 Surface charge measurements and (dis)charging dynamics of organic semiconductors in various media using optical tweezers

Rebecca R. Grollman, Kyle Peters, Oksana Ostroverkhova

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Proceedings Volume 8983, Organic Photonic Materials and Devices XVI; 89831N (2014) https://doi.org/10.1117/12.2040278
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

An exciting application of optical tweezers is the measurement of the surface charge on a trapped particle, as well as its time evolution with a single charge resolution. We report on an optical tweezer-based method to measure the effective surface charge on an organic semiconductor film at microscopic scales, which offers opportunities for investigations of ion and electron transfer between organic molecules and surrounding medium. Effective charge densities of 13±5 elementary charges per μm² were observed in anthradithiophene-coated silica microspheres suspended in water, with a more than an order of magnitude reduction in charge densities upon replacing water with the 50% wt/wt glycerol/water mixture.

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Rebecca R. Grollman, Kyle Peters, and Oksana Ostroverkhova "Surface charge measurements and (dis)charging dynamics of organic semiconductors in various media using optical tweezers", Proc. SPIE 8983, Organic Photonic Materials and Devices XVI, 89831N (7 March 2014); https://doi.org/10.1117/12.2040278

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