A simple dye-sensitized solar cell sealing technique using a CO2 laser beam excited by 60 Hz AC discharges |
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| Authors: | Dong-Gil Lee Ji-Tae Hong Guo-Cheng Xu Ho-Sung Kim Kyoung-Jun Lee Sung-Joon Park Whi-Young Kim Hee-Je Kim |
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| Institution: | 1. Department of Electrical Engineering, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan 609-735, Republic of Korea;2. Power generation Division, Korea Hydro-Nuclear Power, Kori, Jangan-eup, Gijang-gun, Busan 619-711, Republic of Korea;3. Department of Biomedical Engineering, Dongju College University, Koijeong-dong, Saha-gu, Busan 604-715, Republic of Korea;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Republic of Korea;2. Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea;1. New Energy Technologies Group, Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto (Espoo), Finland;2. Department of Forest Products Technology, Aalto University School of Chemical Technology, Finland;3. Laboratory of Photonics and Interfaces, Ecole Polytechnique Federale de Lausanne (EPFL), CH G1 551, Station 6, CH-1015 Lausanne, Switzerland;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, China;3. Key Laboratory of Advanced Ceramics Machining Technology, Ministry of Education, Tianjin 300072, China;4. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Analysis Science Group, Samsung Advanced Institute of Technology, Gyeonggi-do 443-803, Republic of Korea;2. Computational Analysis Engineering Group, Samsung SDI, Gyeonggi-do 443-803, Republic of Korea;1. Department of Nanofusion Technology, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea;2. Department of Samsung Advanced Integrated Circuit, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea;3. Department of Flexible and Printable Electronics, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea;4. Department of Nanomechatronics Engineering, Pusan National University, 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea |
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| Abstract: | Dye-sensitized solar cells (DSSCs) use two glass substrates (photo electrode and counter electrode) coated with fluorine-doped tin oxide (FTO) to harvest light into the cell and to collect electrons. The space between the photo electrode and the counter electrode are filled with a liquid type electrolyte for electron transfer into the cell. Therefore, an appropriate sealing method is required to prevent the liquid electrolyte leaking out. In this paper, a simple CO2 laser beam with TEM00 mode excited by a 60 Hz AC discharge was used to seal two glass substrates coated with FTO for the fabrication of DSSCs. The sealing technique improved the durability and stability of the DSSCs. The optimal conditions for the sealing of the DSSCs are related to the pin-hole diameter, the discharge current and the moving velocity of the target. Especially, the CO2 laser beam is used as a heat source that is precisely controlled by the pin-hole, which plays an important role in adjusting its spot size. From these results, the maximum laser power was found to be 40 W at 18 Torr and 35 mA. In order to achieve the best sealing quality, the following parameters are required: a pin-hole diameter of 4 mm, input voltage of 10.73 kV, discharge current of 9.31 mA, moving velocity of 1 mm/s and distance from the target surface of 26.5 cm. Scanning electron microscope images show that the sealing quality obtained using the CO2 laser beam is superior to that obtained using a hot press or soldering iron. |
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