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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.
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.