마이크로웨이브 처리를 한 Pt 상대전극을 채용한 염료감응 태양전지의 물성

• Published in: 대한금속·재료학회지, 53(3) Vol. 53; no. 3; pp. 214 - 219
• Main Authors: 노윤영, Yun Young Noh, 송오성, Oh Sung Song
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 31.03.2015; 대한금속·재료학회
• Subjects: microwave; optical properties; solar cells; solar simulator; sputtering; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2014.53.3.214

The energy conversion efficiency (ECE) of the Pt counter electrode (CE) was improved by microwave irradiation for 0-40 seconds. A 0.45 cm2 sized device with a glass/FTO/blocking layer/TiO2/dye/ electrolyte/microwave-100 nm Pt/glass was prepared. The photovoltaic properties, such as the short circuit current density (Jsc), open circuit voltage (Voc), fill factor (FF), and energy conversion efficiency (ECE), were characterized using a solar simulator and potentiostat. The stress of the Pt layer was examined by X-ray diffraction. The interfacial resistance and catalytic activity were examined by impedance and cyclic voltammetry. The change in surface roughness was examined by atomic force microscopy. The 100 nm Pt CE after microwave irradiation for 10 seconds showed a large compressive stress of over ?4.43×10?3. The measured energy conversion efficiencies of the dye-sensitized solar cell devices with the Pt only and microwave Pt (10 seconds) counter electrodes were 4.60% and 5.72%, respectively. As the microwave irradiation time was increased to more than 10 seconds, the ECE decreased to that of the as-deposited Pt CE due to a decrease in the surface area of the Pt layers. These results suggest that the use of a Pt catalytic layer with the appropriate microwave irradiation conditions may improve the efficiency of dye-sensitized solar cells.(Received June 2, 2014)