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Revisiting the exchange rate dynamics at the US zero lower bound
Jihye Ahn(Jihye Ahn) 서울대학교 경제연구소 2022 Seoul journal of economics Vol.35 No.4
This study revisits the dynamics of dollar/euro exchange rate in response to the US monetary policy shock at the zero lower bound (ZLB) including the COVID-19 pandemic. The key findings are as follows. First, the exchange rate behavior indicates Dornbusch (1976)’s overshooting hypothesis at the states classified as beginning and ending of the ZLB. Second, the revived ZLB induced by the COVID-19 pandemic has a larger impact on the exchange rate than that induced by the global financial crisis. Third, the responses of the exchange rates demonstrate the uncovered interest rate parity and the overshooting.
Ahn, Sejin,Choi, Yoo Jeong,Kim, Kyunhwan,Eo, Young-Joo,Cho, Ara,Gwak, Jihye,Yun, Jae Ho,Shin, Keeshik,Ahn, Seoung Kyu,Yoon, Kyunghoon Wiley-VCH 2013 ChemSusChem Vol.6 No.7
<P>CuInSe2 (CISe) absorber layers for thin-film solar cells were fabricated through the selenization of amorphous Cu-In-S nanoparticles, which were prepared by using a low-temperature colloidal process within one minute without any external heating. Two strategies for obtaining highly dense CISe absorber films were used in this work; the first was the modification of nanoparticle surface through chelate complexation with ethanolamine, and the second strategy utilized the lattice expansion that occurred when S atoms in the precursor particles were replaced with Se during selenization. The synergy of these two strategies allowed formation of highly dense CISe thin films, and devices fabricated using the absorber layer demonstrated efficiencies of up to 7.94% under AM 1.5G illumination without an anti-reflection coating.</P>
Ahn, Sejin,Son, Tae Hwa,Cho, Ara,Gwak, Jihye,Yun, Jae Ho,Shin, Keeshik,Ahn, Seoung Kyu,Park, Sang Hyun,Yoon, Kyunghoon Wiley-VCH 2012 CHEM SUS CHEM Vol.5 No.9
<P>A simple direct solution coating process for forming CuInSe??? (CIS) thin films was described, employing a low-cost and environmentally friendly precursor solution. The precursor solution was prepared by mixing metal acetates, ethanol, and ethanolamine. The facile formation of a precursor solution without the need to prefabricate nanoparticles enables a rapid and easy processing, and the high stability of the solution in air further ensures the precursor preparation and the film deposition in ambient conditions without a glove box. The thin film solar cell fabricated with the absorber film prepared by this route showed an initial conversion efficiency of as high as 7.72???%.</P>