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Atomic‐layer‐deposited ZnO thin‐film transistors with various gate dielectrics
Yang, Jaehyun,Park, Joong Keun,Kim, Sunkook,Choi, Woong,Lee, Sangyoon,Kim, Hyoungsub WILEY‐VCH Verlag 2012 Physica status solidi. PSS. A, Applications and ma Vol.209 No.10
<P><B>Abstract</B></P><P>We have investigated the effects of gate dielectric layers having different microstructures on the crystallographic properties and device performances of atomic‐layer‐deposited (ALD) ZnO thin‐film transistors (TFTs) in a bottom‐gated structure. Among three gate dielectric materials (thermally grown SiO<SUB>2</SUB>, ALD‐HfO<SUB>2</SUB>, and ALD‐Al<SUB>2</SUB>O<SUB>3</SUB>), the ALD‐ZnO layer on Al<SUB>2</SUB>O<SUB>3</SUB> exhibited the best crystallinity and surface morphology due to the excellent surface roughness and/or hydrophilic surface polarity of the amorphous Al<SUB>2</SUB>O<SUB>3</SUB> layer. As a result, it showed the best TFT performance, including field‐effect mobility (∼3.9 cm<SUP>2</SUP>/Vs), subthreshold swing (∼1.35 V/decade), and on/off ratio (∼5 × 10<SUP>7</SUP>).</P>
MoS<sub>2</sub>–InGaZnO Heterojunction Phototransistors with Broad Spectral Responsivity
Yang, Jaehyun,Kwak, Hyena,Lee, Youngbin,Kang, Yu-Seon,Cho, Mann-Ho,Cho, Jeong Ho,Kim, Yong-Hoon,Jeong, Seong-Jun,Park, Seongjun,Lee, Hoo-Jeong,Kim, Hyoungsub American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.13
<P>We introduce an amorphous indium gallium zinc-oxide (a-IGZO) heterostructure phototransistor consisting of solution-based synthetic molybdenum disulfide (few-layered MoS2, with a band gap of similar to 1.7 eV) and sputter-deposited a-IGZO (with a band gap of similar to 3.0 eV) films as a novel sensing element with a broad spectral responsivity. The MoS2 and a-IGZO films serve as a visible light-absorbing layer and a high mobility channel layer, respectively. Spectroscopic measure ments reveal that appropriate band alignment at the heterojunction provides effective transfer of the visible light induced electrons generated in the few-layered MoS2 film to the underlying a-IGZO channel layer with a high carrier mobility. The photoresponse characteristics of the a-IGZO transistor are extended to cover most of the visible range by forming a heterojunction phototransistor that harnesses a visible light responding MoS2 film with a small band gap prepared through a large-area synthetic route. The MoS2-IGZO heterojunction phototransistors exhibit a photoresponsivity of approximately 1.7 A/W at a wavelength of 520 nm (an optical power of 1 mu W) with excellent time-dependent photoresponse dynamics.</P>
Effects of the microstructure of ZnO seed layer on the ZnO nanowire density
Yang, Jaehyun,Lee, Myung Soo,Park, Kyung,Moon, Mi Ran,Jung, Donggeun,Kim, Hyoungsub,Lee, Hoo-Jeong Cambridge University Press (Materials Research Soc 2011 Journal of materials research Vol.26 No.10
<▼1><B>Abstract</B><P/></▼1><▼2><P>In this study, we synthesized ZnO nanowires using Au catalytic particles formed on a ZnO seed layer. We modulated the microstructure of the ZnO seed layer by changing the sputtering power to investigate how the underlying ZnO film microstructure affects the distribution of ZnO nanowires. Examining the samples after each of the three key steps of the growth process (ZnO seed layer deposition, Au catalytic particle formation, and nanowire growth) using various characterization methods such as scanning electron microscopy, transmission electron microscopy, and x-ray diffraction helped us illuminate the profound impacts of the grain size of the seed layer on the nanowire density.</P></▼2>
Synthesis and Luminescent Properties of Poly(9-(3-vinyl-phenyl)-phenanthrene)
Yang, Garam,Lee, Hayoon,Lee, Suji,Jung, Hyocheol,Shin, Hwangyu,Lee, Jaehyun,Park, Jongwook American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.2
<P>Recently, interest of polymer light-emitting diode (PLED) fabricated from conjugated polymer has augmented because PLED has advantage property that is well-suited to flexible lighting and solution processed device. In this presentation, we suggest a new polymer host based on phenanthrene, poly(9-(3-Vinyl-phenyl)-phenanthrene) (PVPP). It can be easily synthesized through simple synthetic methods which are Suzuki and Wittig reactions. PVPP film can be obtained from spin coating with solution used by common solvent. It exhibited PL maximum value of 381 nm and broad PL spectrum. Energy transfer smoothly occurred when the three dopants for green, red and yellow were used in PVPP.</P>
Jaehyun Lee,Kunju Yang,Hyundong Shin,Bokryeon Park,Changwoo Son,Heejeong Jang,Dongchan Park,Hyeung-Sik Lee,Saekwang Ku 한국실험동물학회 2005 Laboratory Animal Research Vol.21 No.4
This study was conducted to obtain the acute information of the subcutaneous dose toxicity of Polycan-originated from Aureobasidium pullulans SM-2001 (half of the dry material is β-1,3/1,6-glucans), having various pharmacological effects, in mice. Test articles were once subcutaneously administered to mice at dose levels of 250, 125 and 62.5 ㎎/㎏. The mortality and changes on body weight, clinical signs and gross observation were monitored during 14 days after dosing. As the results, we could not find mortalities, clinical signs and changes in the body weight except for residuals of test articles and related skin ulcer at injection sites. Hypertrophy of spleen related to the immune modulate effect of Polycan was dose-dependently detected in all dosing groups tested as gross findings, and hyperplasia of lymphatic follicles and increase of number of megakaryocytes in red pulps are dose-dependently observed at histopathological observation of spleen. In addition, infiltration of inflammatory cells in residuals of test articles in injection site were dose dependently detected with skin ulcer in some animals restricted to these injection sites. The skin ulcer detected in the present study was considered to be biting wounds. The results obtained in this study suggest that the Polycan have no systemic toxicity in mice and is therefore likely to be safe for clinical use. The median lethal dose (LD₅₀) and approximate lethal dose in mice after single subcutaneous dose of Polycan were considered over 250 ㎎/㎏, the highest dissolved concentration in distilled water respectively.