Controlled Nanoassembly of Pt Nanoneedles /rGO as Modified Counter Electrode for Enhanced Performace of DSSC

Da Hyun Choi^a, Caroline Sunyong Lee^a, Suhee Kang^a, Varsha Khare^b, Sung Hoon Ahn^b, Dae Seob Song^b, Sanjiv Sonkaria^b, Seheon Kim^b

^aMaterials Engineering, Hanyang University, 5th Engineering Building Rm. #318 Hanyang University, 55 Hanyangdaehak-ro, Sangok-gu, Ansan, 426, Korea, Republic of

^bSeoul National University, Department of Mechanical and Aerospace Engineering, Seoul, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Suhee Kang, 331
Publication date: 5th February 2015

The underlying challenge in harvesting of solar energy through the assembly of dye sensitized solar cells (DSSCs) has increasingly focused on efforts to enhance processing efficiency supported by the implementation of cost effective fabrication technologies. The demand to meet these objectives have pushed further the boundaries of innovation to discover newly acquired material properties and their potential to improve the working performance of DSSCs. One such approach has targeted the counter electrode component of DSSCs with a view to improve controllability in the application of platinum (Pt). One principle aspect critical to the advancement of this rationalized approach is to minimize material usage at the Pt electrode while improving the efficiency in its role as a reductant of the oxidized dye. To address this concern, methods to alter the morphology and hence surface chemistry of the pt material has been explored and applied. The wet chemistry driven fabrication of hybrid Pt needle shaped structures in the presence of ionic liquid (IL) and reduced graphene oxide (rGO) was rationalized to improve electron mobility of the electron transport channel. Further charge transfer at the counter electrode can also be improved by the networking of nanoneedles. The observed decrease in impedance to 97% measured by electrochemical impedance spectroscopic (EIS) analysis is expected to be correlated with increased efficiency on similar scales of magnitude. An important influencing parameter in the working efficiency of Pt nanoneedles relates to the thickness of the counter electrode film and adhesion between material and substrate. Hence to optimize the working applicability of the pt electrode, structural and surface chemical characterization techniques (SEM/TEM/XPS), and photoelectrochemical measurements (CV, PEC, IPCE) will be applied to characterize the electrode of varying thicknesses. Finally,the DSSC will be fabricated with a modified and appropriately optimized counter electrode to achieve better charge transfer capacity and enhanced efficiency.

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International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

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