Optical resonance-mediated spatial modulation of photo-excited carrier concentrations in P3HT/Si nanopillars
(Conference Presentation)

Eunah Kim; Yunae Cho; Ahrum Sohn; Heewon Hwang; Y.  U. Lee; Kyungkon Kim; Hyeong-Ho Park; Joondong Kim; J.  W. Wu; Dong-Wook Kim

doi:10.1117/12.2237308

7 November 2016 Optical resonance-mediated spatial modulation of photo-excited carrier concentrations in P3HT/Si nanopillars (Conference Presentation)

Eunah Kim, Yunae Cho, Ahrum Sohn, Heewon Hwang, Y. U. Lee, Kyungkon Kim, Hyeong-Ho Park, Joondong Kim, J. W. Wu, Dong-Wook Kim

Author Affiliations +

Proceedings Volume 9919, Nanophotonic Materials XIII; 99190U (2016) https://doi.org/10.1117/12.2237308
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

We fabricated Si nanopillar (NP) arrays using e-beam lithography and coated them with poly(3-hexylthiophene-2,5-diyl) (P3HT) organic semiconductor layers. Optical reflection spectra showed that Mie resonance significantly increased the scattering cross-sections of the NPs and strongly concentrated incident light in the NPs. Such concentrated light should produce numerous charge carriers and affect the subsequent drift/diffusion of the carriers. Surface photovoltage (SPV), defined as the difference of the surface potential in dark and under light, could reveal the formation and separation of the photo-generated carriers. Especially, Kelvin probe force microscopy technique allowed us to obtain real space SPV maps with nanoscopic spatial resolution. The SPV values at the NP tops were much larger than those at the flat regions around the NPs. This study would provide us insights into improving performance of organic/inorganic hybrid nanostructure-based devices.

Conference Presentation

Citation Download Citation

Eunah Kim, Yunae Cho, Ahrum Sohn, Heewon Hwang, Y. U. Lee, Kyungkon Kim, Hyeong-Ho Park, Joondong Kim, J. W. Wu, and Dong-Wook Kim "Optical resonance-mediated spatial modulation of photo-excited carrier concentrations in P3HT/Si nanopillars (Conference Presentation)", Proc. SPIE 9919, Nanophotonic Materials XIII, 99190U (7 November 2016); https://doi.org/10.1117/12.2237308

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KEYWORDS

Neptunium

Modulation

Electron beam lithography

Light scattering

Mie scattering

Nanolithography

Organic semiconductors

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