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RISS 인기검색어
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- 저자 : Emmanuel K. Ampadu (검색결과 2 건)
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Kim, Jungdong,Ampadu, Emmanuel K,Choi, Won Jun,Oh, Eunsoon IOP 2019 Nanotechnology Vol.30 No.7
<P>We discussed structural and electrical properties of PbS films deposited by chemical bath deposition. The crystallite size of our films measured by transmission electron microscope was as large as 0.2 <I>μ</I>m in a lateral direction and 1 <I>μ</I>m in a vertical direction, and we obtained a high mobility value of 60 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> at room temperature. We also demonstrated PbS photovoltaic infrared detectors using silver nanowires as transparent electrodes, whose spectral response was measured by Fourier transform infrared spectrometer. The cut-off wavelength was ∼3 <I>μ</I>m at room temperature and ∼4 <I>μ</I>m at 10 K. At 100 K, a pronounced photocurrent peak was observed at <I>λ</I>?=?3.7 <I>μ</I>m. Using finite difference time domain simulations, we demonstrated that silver nanowires worked as nano antennas for generating surface plasmons, resulting in the enhancement of photocurrent. The pronounced photocurrent peak wavelength corresponds to the wavelength where the silver nanowires were located near the constructive interference.</P>
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Jungdong Kim,Emmanuel K. Ampadu,Eunsoon Oh,Hongkyw Choib,Hak-Young Ahn,So-Hye Cho,Won Jun Choi,Ji Young Byun 한국물리학회 2020 Current Applied Physics Vol.20 No.3
We discussed photocurrent spectra of photovoltaic PbS infrared detectors using multi-layer graphene as transparent electrode, where p-PbS films were deposited on TiO2/FTO substrates by chemical bath deposition. In the photocurrent spectra, we observed both above-bandgap and sub-bandgap photocurrent without any external bias. We discussed impurity band model and grain boundary model in order to explain the sub-bandgap photocurrent near 15 μm. Since FTO is transparent in the visible range, we were able to illuminate green laser beam from the FTO back-side, and photo-response up to 50 μm was found to be enhanced. This long wavelength photoresponse was attributed to the excitation of the photo-electrons accumulated at the TiO2/PbS interface. Our photovoltaic PbS devices can detect not only short-infrared but also terahertz radiation at room temperature, which is highly applicable to various fields.
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