http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
차하림,김세현,김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The advancement of DSSC devices towards high photovoltaic performance is at utmost need in order to attain commercialization. In this paper, we report the efficiency optimization of all-solid state DSSC and its significantly enhanced long term stability in 1000 hr. The Pt-free counter electrode (electro-deposited conducting polymer layer) and TiO2 photo-electrode were sandwiched, followed by injection of monomer solution into the gap between two electrodes. The monomer were transferred to polymeric HTM with heat treatment. It is well known that desorption of photosensitizers from the photo-electrode is one of main reason for DSSC stability factor which can be blocked by using an all-solid state electrolyte system in DSSC.
차하림,석승윤,김현조,Suresh Thogiti,Burragoni Sravanthi Goud,신규호,이은지,Ganesh Koyyada,김재홍 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
Partial absorption of the solar spectrum is one of the key limitations of dye-sensitized solar cells (DSSCs). In an attempt to address this issue, we have developed co-sensitized working electrode based dyeanchored counter electrode (DACE) DSSC strategy to achieve panchromatic absorption using multipledyes. Herein, we have synthesized a dithionopyrrole based TP–DTP dye and a porphyrin-based Y351-Sdye and explored to a new type of DSSCs modified with DACE. To realize the effect of DACE electrode onthe DSSC efficiency, we have fabricatedfive different DSSCs devices namely, S-DSSC1, S-DSSC2, S-DACE,CO-DSSC, and CO-DACE using these synthesized dyes and compared their performances systematically. In addition, the detailed impedance and stepped light-induced transient measurements of thephotocurrent and voltage (SLIM-PCV) experiments are also performed to assess the charge transferresistance and charge collection efficiency of these devices. The highest efficiency of 8.72 0.15% isobserved for the CO-DACE-based devices, which is higher than the traditional DSSCs made of single dye-sensitized (S-DSSC1 and S-DSSC2), and co-sensitized DSSC (CO-DSSC). It can be attributed to theenhanced incident photon to current conversion efficiency (IPCE) and short circuit current (Jsc) whichclearly portray the advantage of DACE electrode in harvesting maximum incident light.
차하림,신규호,( Ganesh Koyyada ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The energy transfer is essential for an enhanced dye loading, power conversion efficiency (PCE), and broad light harvesting nature of dye-sensitized solar cells (DSSCs). The energy transfer process is composed of organic fluorescent materials (as an energy donor material), and an organic dye (as an energy acceptor on TiO2 semiconductor surfaces) with solid electrolyte. Organic fluorescence materials can absorb the wavelength light that usually cannot be absorbed in photosensitizers, and emit the wavelength light that can be well absorbed in photosensitizers which enhance the light harvesting efficiency in DSSCs. We believe that proper choice of energy donor and acceptor can optimize the light harvesting property and photovoltaic efficiency of DSSC.
차하림,최정현,( Rajesh Cheruku ),( Suresh Thogiti ),이도경,김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The power conversion efficiency of dye-sensitized solar cells has been limited because electron transport is not fully achieved, and the injected electrons always recombine with the acceptor species before the electrode can collect them. The conduction band of TiO<sub>2</sub> shifts postively with increasing the concentration of the Mo content. The concept of introducing metal-doped TiO<sub>2</sub> blocking layer into the mesoporous TiO<sub>2</sub> network of DSSCs is proposed to enhance the power conversion efficiency. DSSCs based on Mo-TiO<sub>2</sub> blocking layer show an advantage in increasing he charge transport. The charge transfer resistance in DSSC is significantly suppressed by the Mo-doping. As a result of the downward shifted conduction band and increased charge transport, the photocurrent density of the device is improved remarkably with an almost unchanged photovoltage.
차하림,손우성,( Suresh Thogiti ),( Rajesh Cheruku ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Enhancement of the charge transfer rate at the interfacial region in dye sensitized solar cells (DSSCs) is one of the most important criteria determining cell efficiency. Herein, we report a novel strategy for enhancing charge transfer between dye sensitized active layer and current collector by employing W-doped TiO<sub>2</sub> blocking layer. We propose the graded charge transport blocking layer with deposition W-TiO<sub>2</sub> thin film having different ECB at layer by layer for enhancing the diffusion coefficient and length with suppressing the probability of charge recombination. The graded blocking layer significantly increases the electron transfer rate at the interfacial region between the active layer and current collector. In particular, graded 1-5-7-9 W blocking layer exhibits highest photovoltaic performance of 11.54 % without decreasing VOC, which is 50 % higher than basic DSSCs without blocking layer.
차하림,이영서,( Ganesh Koyyada ),이도경,김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Förster resonance energy transfer is crucial for an increased dye loading, photocurrent generation, and broad spectral absorption of dye-sensitized solar cells. This process consists of organic fluorescent materials, and an organic dye with quasi-solid electrolyte. The FM moiety has multiple roles of (i) acting as an extra-electron donor portion, providing more electron density on the organic dye; (ii); controlling molecular aggregation on the TiO2 surface (iii) retarding the back-electron transfer from TiO2 to the redox mediator by forming a compact insulating dye layer; and (iv) acting as an antenna, collecting photons and, through long-range energy transfer, redirecting the captured energy to the dye sensitizer. In this study, DSSCs containing different concentrations (0, 0.5, 1, 1.5 and 2 wt.%) of a FM as the energy donor are investigated using FRET. The power conversion efficiency of DSSCs containing FMs in a quasi-solid electrolyte increased by 40% over a pristine cell.
차하림,( Rajesh Cheruku ),( Suresh Thogiti ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The metal-doped TiO2 blocking layer in the mesoporous TiO2 network of dye-sensitized solar cells (DSSCs) is suggested to enhance the power conversion efficiency. DSSCs based on Mo-TiO2 blocking layer enhances the charge transport in the photoanode, because the downward shifted conduction band and increased charge transport, the photocurrent density (Jsc) of the devices are improved remarkably with an almost unchanged photovoltage. We believe that the electron diffusion length on the TiO2 network in photo-electrode is not sufficient to reach the thoretical maximum efficiency of DSSC and thus, doping of metal into TiO2 blocking layer can enhance the electron correcting efficiency in the photo-electrode in DSSC.
바실리 칸딘스키의 조형적 전시 공간 계획에 관한 연구 - 자연물을 모티브로 한 평면, 입체 구성을 바탕으로 -
김소현,김희원,차하림,이진민,신은별 숙명여자대학교 디자인연구소 2018 숙명디자인학 연구 Vol.25 No.-
본 연구는 공간 디자인 스튜디오Ⅱ 수업에서진행한 전시 공간 디자인에 관한 연구로서, 디자인요소와 원리에 따른 기초 디자인 이론을 바탕으로 조형에 대해 탐구하고 2D, 3D, 4D 공간으로 차원의 확장에 따른 조형 구성을 통한 전시 공간 디자인 프로젝트이다. 본 연구는 크게 세가지로 나뉜다. 첫째, 바실리칸딘스키에 대한 이론을 바탕으로 그의 예술철학 및 작품세계를 분석하여 조형의 심미적 요소를 고찰하고 둘째, 자연물 관찰을 바탕으로 점, 선, 면의 디자인 요소를 사용하여 평면 구성을 선행한다. 입체, 공간으로 까지 확장하여 조형하며 셋째, 이에 적합한 전시 컨텐츠를 적용해 구체적인 설계과정을 거쳐 전시 공간으로 공간을 계획한다. 끝으로 본 연구는 전시 공간 디자인 방법을 연 구하는데 있어 조형적이고 컨텐츠 융합적인 독창적 방법을 제시하고 기초 디자인 이론을 바탕으로 체계적인 조형세계를 구축한 전시 공간을 계획한다. 향후 이와 관련된 전시 공간디자인 프로세스 개발에 있어서 기초 자료로 사용될 것으로 기대한 다.