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1,261 results on '"Lee, Mi Jung"'

207. Serendipitous Doping in Nickel Oxide upon Microwave‐Induced Low‐Temperature Crystallization Enhances Efficiency of Perovskite Solar Cells.

Author

Hong, Jungyun, Kim, Chaewon, In, Chang Min, Kim, Sohyeon, Cho, Won-Ju, Pecunia, Vincenzo, Lee, Mi Jung, and Hwang, Inchan

Subjects
SOLAR cell efficiency, PHOTOVOLTAIC power systems, NICKEL oxide, NICKEL oxides, CRYSTALLIZATION, INDIUM tin oxide, OPEN-circuit voltage, SHORT-circuit currents
Abstract

Solution‐processed nickel oxide (NiOx) requires high temperatures (≈300 °C) and a long time (up to 1 h) to crystallize from precursors. Herein, thin films of NiOx are successfully crystallized at significantly low processing temperatures of ≈130 °C within a few minutes utilizing microwave irradiation. Microwave‐annealed NiOx (MWA‐NiOx) shows high electrical conductivity and transmittance comparable with those of conventional thermally annealed NiOx (CTA‐NiOx). NiOx crystallization occurs by ohmic heating mechanisms in the indium tin oxide layer, which simultaneously facilitates the diffusion of In and Sn metal cations into the NiOx layer. Consequently, the chemical composition in the MWA‐NiOx layer shows that both Ni2+ and Ni>3+ species are reduced, which is infeasible with CTA processes, where a decrease in one species necessitates an increase in another. MWA‐NiOx is incorporated as a hole transport layer in triple‐cation perovskite (Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3)‐based solar cells. The short‐circuit current and open‐circuit voltage are enhanced compared with those of CTA‐NiOx devices owing to the combined effects of enhanced conductivity, reduced Ni>3+ composition, and better energy‐level alignment. This proposed crystallization technique of using microwave irradiation could be an effective alternative to conventional processes in improving the suitability of NiOx for optoelectronic applications. [ABSTRACT FROM AUTHOR]

Published
2022
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227. Quasi‐2D Perovskites: Controlling Spatial Crystallization Uniformity and Phase Orientation of Quasi‐2D Perovskite‐Based Light‐Emitting Diodes Using Lewis Bases (Adv. Mater. Interfaces 2/2020)

Author

Han, Yaeeun, primary, Park, Sungbin, additional, Wang, Jian, additional, Jariwala, Sarthak, additional, Lee, Kangmin, additional, Bischak, Connor G., additional, Kim, Sohyeon, additional, Hong, Jungyun, additional, Kim, Sunwoo, additional, Lee, Mi Jung, additional, Ginger, David S., additional, and Hwang, Inchan, additional

Published
2020
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238. Controlling Spatial Crystallization Uniformity and Phase Orientation of Quasi‐2D Perovskite‐Based Light‐Emitting Diodes Using Lewis Bases

Author

Han, Yaeeun, primary, Park, Sungbin, additional, Wang, Jian, additional, Jariwala, Sarthak, additional, Lee, Kangmin, additional, Bischak, Connor G., additional, Kim, Sohyeon, additional, Hong, Jungyun, additional, Kim, Sunwoo, additional, Lee, Mi Jung, additional, Ginger, David S., additional, and Hwang, Inchan, additional

Published
2019
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245. A Study on the Pizza Restaurants Customer Satisfaction a Priority Using AHP

Author

Shin Cheon Sik, Yoo Ji Chul, Chung Soon Suk, Kyeong Kyoo Wang, and Lee Mi Jung

Subjects
Analytic hierarchy process, Customer satisfaction, Business, Marketing, Business management
Abstract

This study is currently pizza restaurants in saturated unprofessional targets. pizza restaurants in Korea General 20-30 consumers to quantify the...

Published
2016

248. Alkalic to tholeiitic magmatism near a mid-ocean ridge: petrogenesis of the KR1 Seamount Trail adjacent to the Australian-Antarctic Ridge.

Author

Yi, Sang-Bong, Lee, Mi Jung, Park, Sung-Hyun, Nagao, Keisuke, Han, Seunghee, Yang, Yun Seok, Choi, Hakkyum, Baek, Jongmin, and Sumino, Hirochika

Subjects
*MID-ocean ridges, *THOLEIITE, *OCEANIC crust, *PETROGENESIS, *MAGMATISM
Abstract

Coexisting alkalic and tholeiitic basalt lavas has been identified in a seamount chain located near the Australian–Antarctic spreading ridge. The KR1 Seamount Trail (KR1 ST) is a series of volcanic seamounts extending to the southeast in the spreading direction of the Australian–Antarctic Ridge (AAR). We herein report Sr, Nd and Pb isotopic compositions and (U–Th)/He and K–Ar geochronology for dredge samples from the KR1 ST in order to evaluate mantle processes and the role of enriched components for alkalic to tholeiitic magma generation in this region. The KR1 ST is a medium-sized seamount chain that extends for ~60 km, has a maximum height of ~1600 m above the seafloor, and consists of alkaline basalts and tholeiites with formation ages of ~0.4 Ma to ≤1.3 Ma. The isotopic characteristics of the alkaline basalts (206Pb/204Pb = 19.52–19.91; 87Sr/86Sr = 0.7030–0.7033; 143Nd/144Nd = 0.5128–0.5130) from the KR1 ST reflect a dominant 'PREMA (or FOZO)' mantle component represented by radiogenic Pb and mildly enriched Sr and Nd isotopic compositions. On the other hand, the weak PREMA (FOZO)-affinity (206Pb/204Pb = 18.89–18.93; 87Sr/86Sr = 0.7028–0.7029; 143Nd/144Nd = ~0.5130; 3He/4He = 7.64 ± 0.13 (R/RA)) coupled with their enriched mid-ocean ridge basalt (E-MORB) characteristics of tholeiites from the KR1 ST largely overlap with the KR1 MORB composition. The potential source materials for the alkaline basalts are considered to be ancient, recycled oceanic crust (i.e. eclogite) as well as sub-KR1 depleted MORB mantle (DMM). Whereas the main source materials for the KR1 ST tholeiites are presumed to be the DMM-dominant lithology with minor recycled material. We interpret the KR1 ST as a submarine hotspot chain that was formed by asthenospheric upwelling and spreading processes that delivered fertile blobs of recycled oceanic crust to the sub-KR1 region. The fundamental reason for sub-KR1 upper mantle enrichment might be attributed to a mantle plume event that possibly occurred prior to the formation of the KR1 ST. [ABSTRACT FROM AUTHOR]

Published
2021
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