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Ho, Phuong,Thogiti, Suresh,Bao, Le Quoc,Cheruku, Rajesh,Ahn, Kwang-Soon,Hong Kim, Jae Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.161 No.-
<P><B>Abstract</B></P> <P>The efficiency of tandem pn-dye-sensitized solar cells (pn-DSCs) has been limited by the poor performance of the available p-DSCs. A facile approach of introducing a compact NiO blocking layer into an active NiO photocathode network of p-DSCs and pn-DSCs is presented to enrich the power conversion efficiency (PCE) using a Co<SUP>2+/3+</SUP> redox mediator. Two photoelectrodes sensitized with different dyes (SQ for n-DSC and P1 for p-DSC) have a complementary nature in absorbing solar irradiation at different wavelengths. The constructed pn-DSC demonstrates an enhanced photovoltage compared to n-DSC, resulting in an overall PCE of 1.486%. This PCE is further improved to 1.913% by the addition of an optimized NiO blocking layer to the p-DSC; this was prepared <I>via</I> spin-coating with a nickel acetate precursor solution. All photovoltaic parameters were significantly increased with the introduction of a blocking layer compared to a bare cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiO blocking layer was fabricated for Co-based pn-DSCs via spin-coating method. </LI> <LI> The charge recombination was suppressed with a compact NiO blocking layer. </LI> <LI> The charge transfer and lifetime was improved for pn-DSCs with NiO blocking layer. </LI> <LI> Highest PCE of 1.913% achieved by the addition of an optimized NiO blocking layer. </LI> <LI> We have achieved one of the best PCE for pn-DSCs until today. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A facile approach of introducing a compact NiO blocking layer into an active NiO photocathode network of pn-DSCs is presented to enrich the power conversion efficiency (PCE) using a Co<SUP>2+/3+</SUP> redox mediator. The constructed pn-DSC demonstrates an enhanced photovoltage compared to n-DSC, resulting in an overall PCE of 1.486%. This PCE is further improved to 1.913% by the addition of an optimized NiO blocking layer. All photovoltaic parameters were significantly increased with the introduction of a blocking layer compared to a bare cell.</P> <P>[DISPLAY OMISSION]</P>
Influence of an Al-blended TiO2 photoanode on the photovoltaic properties of n-DSSCs
Jang, Bo Youn,Thogiti, Suresh,Cheruku, Rajesh,Kim, Jae Hong Informa UK (TaylorFrancis) 2016 Molecular Crystals and Liquid Crystals Vol.637 No.1
<P>The performance of n-type dye-sensitized solar cells (n-DSSCs) based on a Co complex redox electrolyte were investigated with a photoanode composed with mixer consists of both TiO2 and AlCl3. Thesurfaceof TiO2 films coated on FTO glass substrates was amended by soaking them in a TiCl4:AlCl3 blended aqueous solution at different molar ratios, and calcining them to yield the surface-modified photoelectrodes (Ti:Al/TiO2). An enhancement in the power conversion efficiency 2.02% of the resulting n-DSSCs with Ti:Al (9:1)/TiO2 compared to the reference cell by the plain TiO2. The dark current measurements, incident photon-to-current conversion, and efficiency electrochemical impedance spectroscopy (EIS) revealed that the combination of a mixer onto the TiO2 film led to the delay of the charge recombination among the photo-injected electrons and Co complex redox electrolyte, resulting in an enhanced short-circuit current and open-circuit current, compared to device without surface modification.</P>
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.
이영서,김재홍,전지훈,( Suresh Thogiti ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
dye-sensitized solar cells have been attracted great attention due to its low cost and ease of fabrication. Recently, metal-free organic dyes as alternative sensitizers have attracted considerable attention because of their potential advantages, such as control of the structure of organic compounds, the use of inexpensive and environmentally benign resources, high molar extinction coefficient, and facile synthesis. More and more efforts have been dedicated to development of metal-free organic dyes which exhibit not only higher molar extinction coefficients, but also simple preparation and purification procedures at lower cost. In this investigation, we have developed novel organic dyes in which two different donor with different electron donation ability attached on ullazine core applied on DSSCs. The optical, electrochemical, and photovoltaic performance of DSSC composed of these organic chromophores were measured and evaluated by comparison with that of standard ruthenium dye N719.
장유정,석승윤,( Suresh Thogiti ),( Rajesh Cheruku ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The novel concept of introducing cascade structure into the photo-anode network with Metal-doped photo-electrode in dye-sensitized solar cells (DSSCs) such as W and Mo is proposed to increase the power conversion efficiency. An improvement in the device performance was obtained when layered metal-doped TiO2 films graded band structure were applied as the photo-anode of DSSCs. DSSCs containing the graded band structure engineered photo-electrode exhibited the significant enhanced photocurrent density and photovoltaic performance without decreasing the VOC, which is 50 % higher than basic DSSCs without a blocking layer. These findings suggest an innovative route toward the harvesting solar energy by enhancing the carrier charge transfer rate.
장보윤,김동우,( Suresh Thogiti ),김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The effect of temperature variations on the performance of dye-sensitized solar cells (DSSC), based on quasi-solid electrolyte, has been studied under 1 sun irradiance. The cell performance was characterized with J-V curves obtained at different cell operating temperatures and electrochemical impedance spectroscopy measurements before and after the temperature treatments. The measured temperature range was from ca. 25°C to 75°C at an interval of ca. 10°C. The results show the higher temperature, the higher photo-current density of DSSCs. At lower temperatures, the short-circuit current (JSC) is limited by the conductivity of electrolyte, while at higher temperatures, the JSC increases due to more pronounced charge transport.
Understanding of Mechanism and Enhanced Electron Mobility for the Bifacial Dye-sensitized Solar Cell
장유정,곽수정,( Suresh Thogiti ),김재홍 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The mechanism and electron transfer rate of bifacial dye-sensitized solar cells was not fully understood yet, however the photovoltaic efficiency and IPCE of dye-sensitized solar cells enhanced, significantly. The bifacial DSSC was composed with two TiO<sub>2</sub> layers, a layer was used with the photo-electrode with photosensitizer, an another layer was used on the Pt counter-electrode which was absorbed different photosensitizer to absorb different wavelength of light that photosensitizer absorbed in the photo-electrode. We believe that the second layer of TiO<sub>2</sub> can act as the hole transfer layer from HOMO of the excited photosensitizer which can enhance the photovoltaic performance of DSSC.