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Ryu, Jiheon,Kim, Kiho,Lim, Tae Hyun,Kwon, Hae-Ok,Kuk, Jeong Hyeon,Choi, Jin Soo,Baek, Sung-Hyun,Yu, Jong-Won IEEE 2019 IEEE antennas and wireless propagation letters Vol.18 No.4
<P>This letter presents a directive integrated-antenna-source (DIAS) for a high-power ultrawideband parabolic reflector system. Unlike the previously developed omnidirectional integrated-antenna-source (OIAS) that leads to spillover loss in a high-power parabolic reflector system, the proposed DIAS reduces the spillover loss in the system. The DIAS is designed by cutting away the halves of the two electrodes in the OIAS. The DIAS-based reflector system was designed through numerical electromagnetic simulations. The proposed DIAS was fabricated for validation. The proposed DIAS shows 3 dB beamwidths on the <I>H</I>-plane and <I>E</I>-plane of 234° and 116°, respectively, in the peak electric-field patterns. In addition, the DIAS has a much smaller capacitance than the OIAS. The proposed DIAS-based reflector system has a peak electric-field strength of 39.5 kV/m at a distance of 40 m. The results show that, although the DIAS has a much smaller capacitance than the OIAS, the DIAS-based reflector system is capable of producing high-power electromagnetic pulses similar to those of the OIAS-based reflector system.</P>
Multifunctional Green Solvent for Efficient Perovskite Solar Cells
Jaemin Cho,Beomsoo Kim,Seokjoo Ryu,Alan Jiwan Yun,Bumjin Gil,Jiheon Lim,Jihyun Kim,Jinhyun Kim,Byungwoo Park 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.5
Organometal trihalide perovskite has recently been considered as one of the leading candidates to achieve highly effi cient perovskite solar cells (PSCs). However, current PSC procedures commonly rely on the large volume of highly toxic halogenated or highly fl ammable solvents which are not favorable for the large-scale commercialization of PSCs. Herein, we employ nontoxic and nonhalogenated salicylaldehyde from the buckwheat as a both nonpolar (antisolvent) and polar (posttreatmentdissolving) solvent for the multifunctional purpose. Salicylaldehyde has a semipolar characteristic due to the hydroxyl group (–OH) attached to the benzene ring, enabling it to utilize both polar and nonpolar solvents in the PSCs fabrications. As a result, the PSC using green solvent achieved a power conversion effi ciency (PCE) up to 20.23%. Encapsulated devices retained over 80% of their initial PCE, after ~ 750 h of constant 1-sun illumination, and after ~ 1100 h under 60 °C heat. Overall, this work demonstrates that salicylaldehyde can be an alternative solvent for green and effi cient fabrication in the PSC.