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Jeong, Junkyeong,Kang, Donghee,Chun, Do Hyung,Shin, Dongguen,Park, Jong Hyeok,Cho, Sang Wan,Jeong, Kwangho,Lee, Hyunbok,Yi, Yeonjin Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.495 No.-
<P><B>Abstract</B></P> <P>Direct evidence of chemical interaction and origin of electron accumulation at a “buried” methylammonium lead triiodide (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>, hereafter “MAPI”)/TiO<SUB>2</SUB> interface is presented in this study for the first time. Despite the high power conversion efficiency of perovskite solar cells (PSCs) using a TiO<SUB>2</SUB> electron transport layer, the MAPI/TiO<SUB>2</SUB> interface is believed as an electron accumulation position during device operation. To elucidate the cause of the electron accumulation, the energy level alignment at the MAPI/TiO<SUB>2</SUB> interface should be understood. However, a buried MAPI/TiO<SUB>2</SUB> interface forms after a thick MAPI layer deposition; thus, the electronic structure of the MAPI/TiO<SUB>2</SUB> interface cannot be measured using surface-sensitive photoelectron spectroscopy in a conventional stack-up manner. In this study, we investigated the electronic structure of a buried MAPI/TiO<SUB>2</SUB> interface by removing the MAPI and organic layers using solvent immersion. As a result, we reveal that a conduction band minimum (CBM) mismatch occurs owing to the TiOPb bonding on the TiO<SUB>2</SUB> surface. The TiOPb bonds form by the Pb ions penetrating during the spin coating of the MAPI solution. When a [6,6]-phenyl C<SUB>61</SUB> butyric acid methyl ester (PCBM) layer was inserted, the CBM mismatch was removed owing to the high work function of PCBM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The electronic structure of a buried MAPI/TiO<SUB>2</SUB> interface was investigated. </LI> <LI> The TiOPb bonding on the TiO<SUB>2</SUB> surface occurred after MAPI deposition. </LI> <LI> The CBM mismatch was observed owing to the TiOPb bond formation. </LI> <LI> With PCBM, the cascaded CBM was formed owing to its high work function. </LI> <LI> The cascaded CBM significantly improved the solar cell performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
25-Gb/s Clocked Pluggable Optics for High-Density Data Center Interconnections
Jeong, Gyu-Seob,Hwang, Jeongho,Choi, Hong-Seok,Do, Hyungrok,Koh, Daehyun,Yun, Daeyoung,Lee, Jinhyung,Park, Kwanseo,Ko, Han-Gon,Lee, Kwangho,Joo, Jiho,Kim, Gyungock,Jeong, Deog-Kyoon IEEE 2018 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.65 No.10
<P>This brief presents a clocked pluggable optics suitable for high-density data center interconnections. The proposed architecture performs a SERDES function at the module side by exploiting a forwarded clock from the ASIC. Due to the relaxed channel loss of the ASIC-to-module interface, the use of power-hungry equalizers can be avoided. Based on an 850-nm multi-mode fiber interface, a 25-Gb/s link operation is demonstrated. A vertical-cavity surface-emitting laser-based transmitter outputs an optical modulation power of 0.6 mW. The optical receiver sensitivity is measured to be −7.5 dBm at 21.2 Gb/s with an optical excitation, and <TEX>$120~{\mu }\text{A}_{\text{pp}}$</TEX> at 25 Gb/s with an electrical excitation. The jitter tracking capability of the implemented clock and data recovery is evaluated in the presence of ±100-ppm frequency offsets and the measured jitter tolerance complies with the 100 GbE specification well. The optical transceiver is implemented in 65-nm CMOS technology and consumes 281 mW at 25 Gb/s, corresponding to the energy efficiency of 11.2 pJ/b.</P>
정광호(Kwangho Jeong),여동훈(Donghoon Yeo),이새낭(Saenang Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Vehicle corrosion is closely related to the consumer"s safety and the emotional quality. Generally, the car makers evaluate the corrosion performance through the test-vehicle driving during vehicle development period. Prior to this, supplier progress variety of testing when develop components, however, they lack an understanding of the corrosion testing including the procedure and evaluation. Previous paper mentioned about the corrosion evaluation method of the GM, and this paper contains the reliability assessments of the supplier’s evaluation method. For the purpose of this paper, sharing the information about the result and research of the dissatisfied elements with component development supplier after conducting the test under the same condition.
정광호(Kwangho Jeong),여동훈(Donghoon Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The target year of corrosion for new developing vehicles is aimed to 1-2-5-10 year (underbody/underhood/exterior-interior-secondary surface cosmetic corrosion and functional corrosion). The car makers have developed cyclic laboratory test for evaluating the corrosion resistance of steel components and subsystems. Perforation life estimation used corrosion model method. In this paper, the comparisons for door hemming flanges of PG and Lab corrosion test will be discussed.
Stainless Steel의 Stress Corrosion Cracking 평가
정광호(Kwangho Jeong),함길주(Kilju Ham) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The vehicles stopped or driving are exposed to various corrosive environments. Because of this corrosive environment, the body panels and many parts corrode. This degrades the quality of consumers" emotions, and will lead to functional trouble of parts. Each part is placed under the different stresses, due to the interaction of these stresses and corrosive environment components will lead to breakage. This research investigated stress corrosion cracking for stainless steel under tensile stress and in a corrosive environment. Under applied tensile stress, salt spray test and complex corrosion test were compared. Between the vehicle and lab testing, SSC predictions about the lifetime of parts could analyze.
GMW14872 복합부식시험을 이용한 실차 모사 내식성 평가
정광호(Kwangho Jeong),함길주(Kilju Ham) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
By using vehicle durability test combined with corrosion reflecting corrosion environment of actual market area, evaluation /improvement for corrosion weak-point has carried out . But evaluation/improvement using vehicle test is more expensive, and takes long-time to simulate real corrosion phenomenon. About this, all car makers is applying to specification of lab accelerated corrosion test represented vehicle corrosion. Here test process and test example of cyclic corrosion test applying in our company introduce.
정상화,최석봉,차경래,김광호,박준호,이경형 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
In the semiconductor and the optical industry a new transport system which can replace the conventional sliding system is required. These systems are driven by magnetic field and conveyer belt. The magnetic field damages semiconductor and contact force scratches the optical lens. The ultrasonic wave driven system can solve these problem. In this paper, the relationship of transporting speed according to the change of flexural beam shape and the effect of transporting speed according to the change of weight and amplification voltage are verified. The vibration behavior of flexural beam in the ultrasonic transport system is experimented using Laser Scanning Vibrometer.