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Optical resonance-mediated spatial modulation of photo-excited carrier concentrations in P3HT/Si nanopillars (Conference Presentation)
Author(s): Eunah Kim; Yunae Cho; Ahrum Sohn; Heewon Hwang; Y. U. Lee; Kyungkon Kim; Hyeong-Ho Park; Joondong Kim; J. W. Wu; Dong-Wook Kim
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Paper 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.

Paper Details

Date Published: 7 November 2016
PDF: 1 pages
Proc. SPIE 9919, Nanophotonic Materials XIII, 99190U (7 November 2016); doi: 10.1117/12.2237308
Show Author Affiliations
Eunah Kim, Ewha Womans Univ. (Korea, Republic of)
Yunae Cho, Ewha Womans Univ. (Korea, Republic of)
Ahrum Sohn, Ewha Womans Univ. (Korea, Republic of)
Heewon Hwang, Ewha Womans Univ. (Korea, Republic of)
Y. U. Lee, Ewha Womans Univ. (Korea, Republic of)
Kyungkon Kim, Ewha Womans Univ. (Korea, Republic of)
Hyeong-Ho Park, Korea Advanced Nano Fab Ctr. (Korea, Republic of)
Joondong Kim, Incheon National Univ. (Korea, Republic of)
J. W. Wu, Ewha Womans Univ. (Korea, Republic of)
Dong-Wook Kim, Ewha Womans Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 9919:
Nanophotonic Materials XIII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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



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