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Korean Journal of Metals and Materials > Volume 54(8); 2016 > Article
Korean Journal of Metals and Materials 2016;54(8): 615-620. doi: https://doi.org/10.3365/KJMM.2016.54.8.615
니켈실리사이드 상대전극을 이용한 염료감응형 태양전지의 물성 연구
김광배, 노윤영, 최민경, 송오성
서울시립대학교 신소재공학과
Properties of a Counter Electrode with Nickel Silicides in a Dye Sensitized Solar Cell
Kwangbae Kim, Yunyoung Noh, Minkyoung Choi, 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: 14 January 2016;  Accepted: 28 February 2016.  Published online: 5 August 2016.
ABSTRACT
Nickel silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 50 nm Si/ 50 nm Ni was formed on glass or quartz by sputtering, and nickel silicides were formed by vacuum heat treatments at 450 and 800 ℃ for 30 min. X-ray diffraction (XRD) and Auger electron spectroscopy (AES) depth profiling analysis was used to confirm the formation of nickel silicides. Also, cyclic voltammetry (CV) analysis was employed to confirm the catalytic activity, and photovoltaic properties were confirmed using a simulator and potentiostat. The XRD and AES results reveated that NiSi and NiSi2 were formed by annealing at 450 and 800 ℃, respectively. The results of the CV analysis showed that both NiSi and NiSi2 exhibited catalytic activity. The energy conversion efficiencies (ECE) of DSSCs with NiSi and NiSi2 catalysts were 1.31% and 3.86%, respectively, while the device employing the Pt catalyst showed an ECE of 5.49%. This result implies that NiSi2 can replace Pt when the processing condition is optimized.
Keywords: solar cells, annealing, phase transformation, X-ray diffraction, catalytic activity
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