Mie Resonance-Modulated Spatial Distributions of Photogenerated Carriers in Poly(3-hexylthiophene-2,5-diyl)/Silicon Nanopillars

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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6 Scopus citations


Organic/silicon hybrid solar cells have great potential as low-cost, high-efficiency photovoltaic devices. The superior light trapping capability, mediated by the optical resonances, of the organic/silicon hybrid nanostructure-based cells enhances their optical performance. In this work, we fabricated Si nanopillar (NP) arrays coated with organic semiconductor, poly(3-hexylthiophene-2,5-diyl), layers. Experimental and calculated optical properties of the samples showed that Mie-resonance strongly concentrated incoming light in the NPs. Spatial mapping of surface photovoltage, i.e., changes in the surface potential under illumination, using Kelvin probe force microscopy enabled us to visualize the local behavior of the photogenerated carriers in our samples. Under red light, surface photovoltage was much larger (63 meV) on the top surface of a NP than on a planar sample (13 meV), which demonstrated that the confined light in the NPs produced numerous carriers within the NPs. Since the silicon NPs provide pathways for efficient carrier transportation, high collection probability of the photogenerated carriers near the NPs can be expected. This suggests that the optical resonance in organic/silicon hybrid nanostructures benefits not only broad-band light trapping but also efficient carrier collection.

Original languageEnglish
Article number29472
JournalScientific Reports
StatePublished - 8 Jul 2016

Bibliographical note

Funding Information:
This work was supported by Korea Institute of Energy Technology Evaluation and Planning Grant (KETEP-20133030011000) and the Quantum Metamaterials Research Center (QMMRC) through the National Research Foundation of Korea Grant (No. 2015001948).


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