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Um, Han-Don,Park, Kwang-Tae,Jung, Jin-Young,Li, Xiaopeng,Zhou, Keya,Jee, Sang-Won,Lee, Jung-Ho RSC Pub 2014 Nanoscale Vol.6 No.10
<P>Formation of a selective emitter in crystalline silicon solar cells improves photovoltaic conversion efficiency by decoupling emitter regions for light absorption (moderately doped) and metallization (degenerately doped). However, use of a selective emitter in silicon nanowire (Si NW) solar cells is technologically challenging because of difficulties in forming robust Ohmic contacts that interface directly with the top-ends of nanowires. Here we describe a self-aligned selective emitter successfully integrated into an antireflective Si NW solar cell. By one-step metal-assisted chemical etching, NW arrays formed only at light-absorbing areas between top-metal grids while selectively retaining Ohmic contact regions underneath the metal grids. We observed a remarkable 40% enhancement in blue responses of internal quantum efficiency, corresponding to a conversion efficiency of 12.8% in comparison to the 8.05% of a conventional NW solar cell.</P>
Tang, Dongsheng,Wan, Jiahui,Xu, Xiaopeng,Lee, Young Woong,Woo, Han Young,Feng, Kui,Peng, Qiang Elsevier 2018 Nano energy Vol.53 No.-
<P><B>Abstract</B></P> <P>In this work, two wide bandgap polymers of PDTT-TZNT and PDTF-TZNT were developed by Stille-coupling of naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) acceptor unit with bithiophene (DTH) and fluorinated bithiophene (DTF), respectively. These polymers exhibited a wide bandgap over 1.84 eV. The fluorinated PDTF-TZNT had lower highest occupied molecular orbital HOMO level (− 5.24 eV), higher molar absorption coefficient (1.28 × 10<SUP>5</SUP> M<SUP>−1</SUP> cm<SUP>−1</SUP>), and higher molecular packing order. Using a low bandgap 3,9-bis(2-methylene-(5&6-methyl-(3-(1,1-dicyanomethylene)-indanone)))−5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]-dithiophene (IT-M) as the electron acceptor, the PDTF-TZNT:IT-M devices generated a higher power conversion efficiency (PCE) of 10.05%. To make up the weak absorption of above binary blend of PDTF-TZNT:IT-M in the short wavelength region and increase the device performance further, a large bandgap small molecular acceptor of 5,5,10,10,15,15-hexabutyl-2,7,12-tri(4-(3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile-benzothiadiazole)-truxene (meta-TrBRCN) was added as the second acceptor material to fabricate ternary blend PSCs. The meta-TrBRCN could not only expand the absorption range but also fine-tune the blend morphology by stepwise changing its content. When 0.2 of meta-TrBRCN was added, the PCE of PDTF-TZNT:IT-M devices was improved to 11.48%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two novel naphthobistriazole-based wide bandgap donor polymers were successfully synthesized and characterized. </LI> <LI> The introduced fluorine atoms enabled the PDTF-TZNT:IT-M devices to obtain a higher PCE of 10.05%. </LI> <LI> The ternary blend strategy boosted the PCE up to 11.48% in the PDTF-TZNT<SUB>x</SUB>:IT-M<SUB>y</SUB>:meta-TrBRCN<SUB>z</SUB> devices. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Two novel naphthobistriazole-based wide bandgap polymers, PDTH-TZNT and PDTF-TZNT, has been developed for non-fullerene polymer solar cells. The fluorinated PDTF-TZNT exhibited a higher PCE of 10.05% in binary PDTT-FTAZ:IT-M devices. By adding 0.2 of meta-TrBRCN as the second acceptor, the related ternary blend devices exhibited a significantly improved PCE of 11.48%.</P> <P>[DISPLAY OMISSION]</P>
Zhou, Keya,Guo, Zhongyi,Li, Xiaopeng,Jung, Jin-Young,Jee, Sang-Won,Park, Kwang-Tae,Um, Han-Don,Wang, Ning,Lee, Jung-Ho Optical Society of America 2012 Optics express Vol.20 No.5
<P>We perform a systematic numerical study to characterize the tradeoff between the plasmonic enhancement and optical loss in periodically aligned, silicon nanowire (SiNW) arrays integrated with a silver back reflector (Ag BR). Optimizing the embedded depth of the wire bottoms into a silver reflector achieved a highly efficient SiNW solar cell. Compared to the SiNW solar cell employing a flat back reflector, the embedded depth of ~20 nm resulted in the relative increase of ~5% in ultimate solar cell efficiency.</P>
Ying Huang,Xuanyi Peng,Yiwen Yang,Haiwei Wu,Xu Sun,Xiaopeng Han 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Proper process and parameter were investigated to coat Cu or Ni on graphite fl ake (G f ) by electroless plating. Microstructuralcharacterization indicated that the Cu/Ni was coated on the G f uniformly and comprehensively. Then aluminum matrixcomposites reinforced with Si and graphite were fabricated by a unique vacuum gas pressure infi ltration. The thermal conductivityand mechanical properties of the composites, both with and without Cu or Ni coating layers on the graphite surface,have been studied. The obtained results indicated that the mechanical property of the Cu or Ni coated G f /Si/Al compositesdramatically increased, as compared with the non-coated G f /Si/Al composite. In the meantime, Cu or Ni coated G f provedto have better wettability and interfacial bonding with the aluminum matrix, which were expected to be a highly sustainableand dispersible reinforcement for metal matrix composites.
Ergonomic Development and Evaluation of UI Design for Optical Brain- Machine Interface (OBMI) System
Xin Cui(최신아),Hayoung Jung(정하영),Halim Kim(김하림),Yang Xiaopeng(양샤오펑),Linqing Feng(펭린칭),Shaomin Zhang(장샤오민),Mingkang Li(리밍캉),Changhao Liu(리우창하오),Jiawei Han(한지아웨이),Ruixue Wang(왕루이수에),Heecheon You(유희천) 대한인간공학회 2020 대한인간공학회 학술대회논문집 Vol.2020 No.10
Guang-Yao Zhao,Taehyun Jung,Bong Won Sohn,Motoki Kino,Mareki Honma,Richard Dodson,Maria Rioja,Seog-Tae Han,Katsunori Shibata,Do-Young Byun,Kazunori Akiyama,Juan-Carlos Algaba,Tao An,Xiaopeng Cheng,Ilj 한국천문학회 2019 Journal of The Korean Astronomical Society Vol.52 No.1
The KVN(Korean VLBI Network)-style simultaneous multi-frequency receiving mode is demonstrated to be promising for mm-VLBI observations. Recently, other Very long baseline interferometry (VLBI) facilities all over the globe start to implement compatible optics systems. Simultaneous dual/multi-frequency VLBI observations at mm wavelengths with international baselines are thus possible. In this paper, we present the results from the first successful simultaneous 22/43 GHz dualfrequency observation with KaVA(KVN and VERA array), including images and astrometric results. Our analysis shows that the newly implemented simultaneous receiving system has brought a significant extension of the coherence time of the 43 GHz visibility phases along the international baselines. The astrometric results obtained with KaVA are consistent with those obtained with the independent analysis of the KVN data. Our results thus confirm the good performance of the simultaneous receiving systems for the non-KVN stations. Future simultaneous observations with more global stations bring even higher sensitivity and micro-arcsecond level astrometric measurements of the targets.