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Seo, Kwanyong
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Research Interests
  • Flexible solar cell, transparent solar cell, PV-battery hybrid system, hetero-junction solar cell

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Embedded Metal Electrode for Organic-Inorganic Hybrid Nanowire Solar Cells

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Title
Embedded Metal Electrode for Organic-Inorganic Hybrid Nanowire Solar Cells
Author
Um, Han-DonChoi, DeokjaeChoi, AhreumSeo, Ji HoonSeo, Kwanyong
Issue Date
2017-06
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.11, no.6, pp.6218 - 6224
Abstract
We demonstrate here an embedded metal electrode for highly efficient organic-inorganic hybrid nanowire solar cells. The electrode proposed here is an effective alternative to the conventional bus and finger electrode which leads to a localized short circuit at a direct Si/metal contact and has a poor collection efficiency due to a nonoptimized electrode design. In our design, an Ag/SiO2 electrode is embedded into a Si substrate while being positioned between Si nanowire (SiNW) arrays underneath poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), facilitating suppressed recombination at the Si/Ag interface and notable improvements in the fabrication reproducibility. With an optimized microgrid electrode, our 1-cm2 hybrid solar cells exhibit a power conversion efficiency of up to 16.1% with an open-circuit voltage of 607 mV and a short circuit current density of 34.0 mA/cm2. This power conversion efficiency is more than twice as high as that of solar cells using a conventional electrode (8.0%). The microgrid electrode significantly minimizes the optical and electrical losses. This reproducibly yields a superior quantum efficiency of 99% at the main solar spectrum wavelength of 600 nm. In particular, our solar cells exhibit a significant increase in the fill factor of 78.3% compared to that of a conventional electrode (61.4%); this is because of the drastic reduction in the metal/contact resistance of the 1-μm-thick Ag electrode. Hence, the use of our embedded microgrid electrode in the construction of an ideal carrier collection path presents an opportunity in the development of highly efficient organic-inorganic hybrid solar cells.
URI
https://scholarworks.unist.ac.kr/handle/201301/22174
URL
http://pubs.acs.org/doi/abs/10.1021/acsnano.7b02322
DOI
10.1021/acsnano.7b02322
ISSN
1936-0851
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