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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.
김재홍,( Rajesh Cheruku ),( Thogiti Suresh ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Dye-sensitized solar cells (DSCs) have been explored extensively as one kind of the third generation solar cells. Because of their high energy conversion efficiency, low cost, lightness, flexible form, and simple fabrication process. However, the liquid electrolyte based DSCs have many problems such as leakage of liquid electrolyte, corrosion of Pt counter and dye degradation which can limit the long-term stability of DSCs. For such reasons, the all solid-state dye sensitized solar cells (ssDSCs) have been attracting much attention for decades. But ssDSCs currently suffer from issues such as inadequate nanopore filling, low conductivity, and crystallization of hole-transport materials infiltrated in the mesoscopic TiO<sub>2</sub> scaffolds, leading to low performances. In this study, we fabricated ssDSCs using a simple, solution-processed thin MoO<sub>3</sub> anode buffer layer was fabricated for high performance for ssDSC.
Electron diffusion properties in DSSCs by simple Stepped Light Induced Transient measurement
손창희,김동우,( Rajesh Cheruku ),안광순,김재홍 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The measurement of electron diffusion coefficients and electron lifetimes of dye sensitized solar cells (DSSCs) is essentially required to characterize the cell performance, further investigate high performance solar cells. In this research, stepped light induced transient measurements (SLIM) of photocurrent and voltage is conducted to estimate the electron diffusion coefficients and electron lifetimes of DSSCs. SLIM methods is relatively simple experiment, which can simplify the optical setup and reduce measuring time. In this method, the light having different laser intensity is irradiated to the solar cells with using chopper for lighting on/off. Through measuring the decays of short circuit current and open circuit voltage, the diffusion coefficient and lifetime of photo-generated electron in DSSCs are estimated, subsequently diffusion length is obtained.
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.
장보윤,정노을,( Rajesh Cheruku ),안광순,김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The measurement of electron diffusion coefficients and electron lifetimes of dye sensitized solar cells (DSSCs) is essentially required to characterize the cell performance, further investigate high performance solar cells. In this research, stepped light induced transient measurements (SLIM) of photocurrent and voltage is conducted to estimate the electron diffusion coefficients and electron lifetimes of DSSCs. SLIM methods is relatively simple experiment, which can simplify the optical setup and reduce measuring time. In this method, the light having different laser intensity is irradiated to the solar cells with using chopper for lighting on/off.
김동우,박목련,( Rajesh Cheruku ),( Suresh Thogiti ),김재홍 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The power conversion efficiency of dye-sensitized solar cells (DSSCs) 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 TiO2 shifts postively with increasing the concentration of the Mo content. The concept of introducing metal-doped TiO2 blocking layer into the mesoporous TiO2 network of dye-sensitized solar cells (DSSCs) is proposed to enhance the power conversion efficiency. DSSCs based on Mo-TiO2 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 (Jsc) of the device is improved. The power conversion efficiency (η = 8.03%) is obtained at 4% Mo-doping.
이지현,전지훈,( Rajesh Cheruku ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Replacing the Pt counter electrode (CE) for dye-sensitized solar cells (DSSCs) is necessary to reduce its fabrication cost. In this regard, the conductive polymer counter electrode, PEDOT and PANI have attracted much attention on DSSCs. To enhance efficiency, the electrochemical deposition method was used to form a conducting polymeric film onto FTO glass which was carried out in 4 types of solution deposition ratios, 4:6, 6:4, 8:2 and 9:1 with water and acetonitrile mixed solution. The excellent photoelectric properties and low cost allow the conducting polymer incorporated CNT counter electrode to be a credible alternative electrode for DSSCs.