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카본나노튜브 상대전극을 가지는 염료감응형 태양전지의 광전특성
구보근(Koo, Bo-Kun),이동윤(Lee, Dong-Yoon),김현주(Kim, Hyun-Ju),이원재(Lee, Won-Jae),송재성(Song, Jae-Sung),서선희(Seo, Seon-Hee),김선재(Kim, Sun-Jae) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
탄소나노튜브는 화학적 안정성과 고전도성을 갖는 동시에 높은 비표면적을 지니고 있다. 이와 같은 특정으로 염료감응형태양전지의 상대전극으로 사용 가능이 기대되어 지고 있으나, 아직 성공적인 연구가 발표되고 있지 않다. 많은 연구자들이 CNT 자체만으로 원하는 효과를 얻지 못하고 있기 때문에, CNT 조작(가공)을 통해 CNT 특성을 올리고자 노력하였다. 그러나 본 연구에서, 가공하지 않은 CNT powder를 이용하여 paste를 제조하고 doctro-blade법으로 코팅하여 CNT counter electrode를 제조하여 DSSC의 상대전극으로써의 적용 가능성을 조사 해 보았다. 제조된 CNT counter electrode에 대한 CNT 자체만의 전기화학적 특성을 측정하였다. 그리고 DSSC 에 직접 적용하여 전지의 광전특성을 측정하였다. 그 결과 탄소나노튜브의 고전도성 특성과 넓은 비표면적 특성에 의해 상대전극의 전해질/전극계변에서의 전해질의 산화환원 반응에 대한 촉매 작용을 향상시키고, 상대전극 표변에서의 전자전달 속도를 높여 염료감응형 태양전지의 효율을 높이는 것으로 확인되어졌다.
염료감응형 태양전지의 상대전극 재료로서 탄소나노튜브의 전기화학적 특성
김현주,이동윤,구보근,이원재,송재성,이대열,Kim, Hyun-Ju,Lee, Dong-Yun,Koo, Bo-Kun,Lee, Won-Jae,Song, Jae-Sung,Lee, Dae-Yeol 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.10
Studies on porous oxide electrode, dye and electrolyte for dye-sensitized solar cells have been intensively carried out until now. However, counter electrode have not been much studied so far. Accordingly, it is needed to investigate new counter electrode materials with superior catalyst property and to substitute for Pt electrode. In this case, carbon nano-tubes (CNTs) are one of alternatives for counter electrodes as following merits: low resistivity, excellent electron emission property, large surface area and low cost due to development of mass production technique. Such advantages gave us to select multiwalled CNTs (MWCNT) as counter electrode for dye-sensitized solar cell. Also, cyclic voltammetry and impedance spectroscopy were used to investigate electrochemical properties of both CNT electrode and Pt electrode. It was found that sheet resistance of CNT electrode was similar to that of Pt electrode, also, electrochemical properties of CNT electrode was superior to that of Pt electrode on the basis on the measurement of CV and impedance spectrum. It was found that CNT is likely to be a very promising electrode material for dye solar cells.
TiO<sub>2</sub> 전극의 소결 온도에 따른 DSSCs의 전기적 특성 및 AFM 형상 비교
김현주,이동윤,이원재,구보근,송재성,Kim, Hyun-Ju,Lee, Dong-Yun,Lee, Won-Jae,Koo, Bo-Kun,Song, Jae-Sung 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.6
In order to improve the efficiency of dye-sensitized solar cell (DSSC), $TiO_2$ electrode screen-printed on transparent conducting oxide (TCO) substrate was sintered in variation with different temperature$(350\;to\;550^{\circ}C)$. $TiO_2$ electrode on fluorine doped tin oxide (FTO) glass was assembled with Pt counter electrode on FTO glass. I-V properties of DSSCs were measured under solar simulator. Also, effect of sintering temperature on surface morphology of $TiO_2$ films was investigated to understand correlation between its surface morphology and sintering temperature. Such surface morphology was observed by atomic force microscopy (AFM). Below sintering temperature of $500^{\circ}C$, efficiency of DSSCs was relatively lower due to lower open circuit voltage. Oppositely, above sintering temperature of $500^{\circ}C$, efficiency of DSSCs was relatively higher due to higher open circuit voltage. In both cases, lower fill factor (FF) was observed. However, at sintering temperature of $500^{\circ}C$, both efficiency and fill factor of DSSCs were mutually complementary, enhancing highest fill factor and efficiency. Such results can be explained in comparison of surface morphology with schematic diagram of energy states on the $TiO_2$ electrode surface. Consequently, it was considered that optimum sintering temperature of a-terpinol included $TiO_2$ paste is at $500^{\circ}C$.