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A new small molecule base on dithienobenzodithiophene for use in photovoltaic devices
천예림,마재열,윤희준,김란,백장열,김유진,안태규,박찬언,김윤희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
We designed and synthesized a dithienobenzodithiophene (DTBDT)- based molecule with a planar molecular geometry, DTBDT-TTPD, for the fabrication of solution-processable organic solar cells (OSCs). DTBDT-TTPD exhibited both a low optical band gap of 1.88 eV and a low-lying highest occupied molecular orbital (HOMO) energy level of -5.61 eV, indicating that DTBDT-TTPD is a promising electron donor for use in OSCs. OSCs prepared with DTBDT-TTPD as the electron donor and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the electron acceptor were fabricated. An optimized power conversion efficiency of 4.98% with a high short circuit current of 10.6 mA/cm<sup>2</sup> was achieved after finely tuning the morphology through an annealing step. These results indicate that DTBDT-TTPD is an effective compound for producing very promising characteristics in small molecule solar cell devices.
천예림,김유진,박성종,하연희,유셴칭,정대성,박찬언,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Organic bulk heterojunction photovoltaic devices based on a series of three naphtho[2,1-b:3,4-b’]dithiophene (NDT) derivatives blended with phenyl-C71-butyric acid methyl ester were studied. These three derivatives, which have NDT units with various thiophene-chain lengths, were employed as the donor polymers. The influence of their molecular structures on the correlation between their solar-cell performances and their degree of crystallization was assessed. The grazing-incidence angle X-ray diffraction and atomic force microscopy results showed that the three derivatives exhibit three distinct nanoscale morphologies. We correlated these morphologies with the device physics by determining the J-V characteristics and the hole and electron mobilities of the devices. On the basis of our results, we propose new rules for the design of future generations of NDT-based polymers for use in bulk heterojunction solar cells.
New electron-acceptor based polymers for organic thin film transistor
천예림,이기백,박광훈,전찬우,권순기,김윤희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
we report newly synthesized polymeric semiconductors Polymer I & Polymer II the enhancement in field-effect mobility achieved through donor-acceptor copolymer concept. Novel electron acceptor based copolymers were designed by stille coupling reaction. New electron acceptor unit has strong electron accepting property lead to low band gap, two polymers showed strong absorption from 400 to 700 nm. Polymer I and Polymer II has narrow band gap respectively. The high thermal stability of polymers were determined by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) studies. Newly synthesized polymers were observed that field-effect mobility of the organic thin film transistor device based on Polymer I &Polymer II were up to 8 × 10<sup>-4</sup> ㎠/Vs, 1 × 10<sup>-3</sup> ㎠/Vs.
New material with deep HOMO energy levels for solar cells
천예림,윤희준,유셴칭,이예슬,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
We synthesized and designed a novel polymer for solar cells. In This work , We develop a polymer with good solubility in organic solvents, thermal stability and film-fabrication ability. Forming crystalline structures, It can pack closely that enhance charge carrier mobility. Considering above this results, this material shows good properties with high PCE value. As a results, a new method for high performance photovoltaic materials has been developed in designing new structure.
가상현실 점포의 체험요소가 소비자의 지각된 정보의 양, 고객만족 및 재방문의도에 미치는 영향
천예림 ( Ye Rim Cheon ),최우림 ( Woo Lim Choi ),박민정 ( Min Jung Park ),유정민 ( Jung Min Yoo ) 한국의류학회 2019 한국의류학회지 Vol.43 No.5
This study examines whether experiential factors of virtual reality (VR) stores influence consumers' perceived amount of information and satisfaction, which in turn influences revisit intention. This also study examines whether the experiential factors differ as a function of an individual characteristic such as environmental responsiveness. Female consumers who had an experience in using VR technology for digital shopping participated in the online survey. The results showed that educational, escapist and aesthetic experiences have a significant impact on the perceived amount of information, and entertainment and escapist experiences have a significant impact on satisfaction. In addition, the perceived amount of information has a positive effect on customer satisfaction, which in turn has a positive effect on revisit intention. There is also a difference in the effect of experiential factors on consumer responses depending on the environmental responsiveness. This study provides theoretical suggestions for experiential marketing and presents practical implications for developing marketing strategies for digital retailers utilizing VR technology.
조철성,천예림,하종진,하연희,마재열,김유진,박찬언,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A-D-A conjugated polymer, PTPD-TVT, containing thienopyrroledione and thiophene-vinylene-thiophene (TVT) units was synthesized as an electron donor for organic photovoltaic devices. It possesses a small bandgap and has excellent coplanarity and high hole mobility. To further enhance the interchain interactions between the polymer chains, a selenophene-vinylene-selenophene (SVS) unit was also introduced and copolymerized to form the PTPD-SVS polymer. Devices made from PTPD-TVT and PTPD-SVS have rather promising power conversion efficiencies (PCEs) of 4.87 and 5.74%, respectively. The higher PCE value for solar cells based on PTPD-SVS was attributed to an enhanced carrier mobility resulting from stronger interchain aggregation in the BHJ active layer. These results show that the incorporation of a vinylene unit in TPD-based polymers is an effective way to reduce the bandgap and thereby improve charge transport for efficient photovoltaic devices.
유셴칭,천예림,안은수,이소정,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We designed and developed a new material, 2,3-bis(9,9-diethyl-9Hfluoren- 2-yl)-9,10-diphenylanthracene (EFPA), based on anthracene core with phenyl units at its the 9 and 10-positions and fluorene units at its 2 and 3-positions. This blue-emitting material was synthesized via the Suzuki cross-coupling reaction and its structure was confirmed by using FT-IR,<sup>1</sup>H NMR,<sup>13</sup>C NMR, and mass spectroscopy. The optical, electrochemi-cal and thermal properties of the material were investigated, and its the molecular structure-propertyrelationships were evaluated. The non-doped devices using EFPA displayed a maximum external quantum efficiency (EQE) of 2.55% with CIE color coordinates (0.166, 0.197). Doped device using 5% EFPA as the dopant showed a maximum external quantum efficiency of 2.90% and CIE coordinates of (0.142, 0.107).