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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 39-45. doi: https://doi.org/10.3365/KJMM.2017.55.1.39
코발트실리사이드 상대전극을 채용한 염료감응형 태양전지의 물성 연구
노윤영, 김광배, 송오성
서울시립대학교 신소재공학과
Properties of a Counter Electrode with Cobalt Silicides in a Dye Sensitized Solar Cell
Yunyoung Noh, Kwangbae Kim, Ohsung Song
Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea
Correspondence  Ohsung Song ,Tel: +82-2-6490-2410, Email: songos@uos.ac.kr
Received: 4 March 2016;  Accepted: 22 July 2016.  Published online: 5 January 2017.
ABSTRACT
Cobalt silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 100 nm Si/ 100 nm Co on quartz was formed by sputtering and cobalt-silicides were formed by vacuum heat treatment at 500 ℃ and 700 ℃ for 30 min, respectively. Field emission scanning electron microscopy (FE-SEM) was used to analyze the surface microstructure. X-ray diffraction (XRD) and Auger electron spectroscopy (AES) depth profiling analysis were used to confirm the phases. Also, cyclic-voltammetry (CV) analysis was employed to confirm the catalytic activity and photovoltaic properties were confirmed using a simulator and potentiostat. The microstructure analysis indicated that the 500 ℃ and 700 ℃ silicidation led to a uniform planar layer and island-like agglomerates, respectively. In the XRD and AES results, those phases were structures of quartz/CoSi/Co and quartz/dot-(CoSi2/Co). CV analysis showed that Si/Co and CoSi/Co exhibited catalytic activity, while dot-(CoSi2/Co) did not show catalytic activity due to the isolated dot structure. The energy conversion efficiencies of DSSCs with CoSi/Co and dot-(CoSi2/Co) were 3.75% and 0%, respectively, while that of Pt employed DSSC was 5.13%. Our result implies that using the nano-thick CoSi as a reduction catalytic layer may be an effective replacement for Pt.
Keywords: solar cells, annealing, phase transformation, auger electron spectroscopy, catalytic activity
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