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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>
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.
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.
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>
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.
Cho, Jung Min,Thogiti, Suresh,Cheruku, Rajesh,Lee, Do Kyung,Ahn, Kwang-Soon,Kim, Jae Hong American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.5
<P>Three types of carbazole-based organic dyes with different electron anchoring/acceptors were designed and synthesized as the sensitizers for dye-sensitized solar cells (DSSCs). The photophysical and electrochemical properties of these dyes were investigated and their performance as sensitizers in DSSCs was measured. These dyes share the same donor (N-hexylphenylcarbazole) and pi-spacer (thiophene) but differ in the acceptor/anchoring groups incorporated, such as 2-cyanoacetic acid, rhodanine-3-acetic acid or 5-oxo-1-phenyl-2-pyrazolin-3-carboxylic acid, to configure the novel double branched A-pi-D-pi-A framework. The dye with the cyanoacetic acid electron acceptor exhibited the highest solar-to-electrical energy conversion efficiency of 3.9% (short-circuit photocurrent density J(SC) = 95.3 A m(-2), open-circuit photovoltage V-OC = 0.62 V, and fill factor FF = 0.66) under AM 1.5 G solar irradiation.</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.