快速大氣電漿燒結氧化鈦光電極染料敏化太陽能電池
Other Title
Dye-sensitized Solar Cells with TiO2 Photoanodes Rapidly Sintered by Atmospheric Pressure Plasma Jets
Journal
真空科技
Journal Volume
25
Journal Issue
4
Start Page
46
End Page
53
Date Issued
2012
Abstract
本研究利用大氣電漿燒結法來製備氧化鈦薄膜，並應用在染料敏化太陽電池。電漿燒結30 秒的氧化鈦因殘留有機物質，導致在波長400奈米至500奈米有額外的吸收。當燒結時間在一分鐘以上，電漿燒結和傳統燒結的氧化鈦則有相同的吸收頻譜。從掃描式電子顯微鏡和X光繞射儀的分析結果可知，傳統退火和電漿燒結的氧化鈦表面形貌及結晶性並無顯著差異。電漿燒結30秒的光電極太陽能電池，因有機物質殘留而造成電池效率遠低於傳統燒結光電極太陽能電池，電化學阻抗頻譜亦顯示電池有較大的電子傳輸阻抗和較短的電子生命週期。大於一分鐘的大氣電漿燒結光電極太陽能電池效率則和傳統燒結光電極的電池相當，更長的燒結時間並不會再進一步增加電池效率，而呈現穩定的狀態。實驗結果證實使用電漿快速燒結一分鐘可以完全取代傳統熱退火燒結並應用在染料敏化太陽能電池。
Nanoporous TiO2 films are sintered by atmospheric pressure plasma jets. From absorption spectra, a 30-second APPJ-sintered TiO2 layer presents extra absorption band between 400 and 500 nm due to the incomplete removal of organic solvents in the pastes. As the sintering time reaches 60 sec and beyond, the absorption spectra of APPJ-sintered TiO2 are almost identical to that of the furnace-sintered one. The crystallinity and surface morphology of APPJ-sintered TiO2 are similar to that of furnace-sintered sample, confirmed by SEM and XRD experiments. The TiO2 photoanode with 30 sec treatment exhibits poor power conversion efficiency, attributing to the organic residues in the films. The efficiency for DSSC with APPJ-sintered TiO2 becomes comparable to that with conventional furnace-sintered photoanode when APPJ treatment time reaches 60 sec and beyond. Electrochemical impedance spectroscopy (EIS) also shows that the DSSC with 30 sec APPJ-sintered TiO2 photoanode has an extremely large TiO2/dye/electrolyte electron transport interfacial resistance and a short carrier lifetime. Our experimental results demonstrate that a 60-second APPJ sintering process is sufficient to replace the conventional 510°C×15min furnace-sintering process for TiO2 photoanodes of DSSCs.
Subjects
大氣電漿
快速燒結
染料敏化太陽能電池
Atmospheric Pressure Plasma Jet
Rapid Sintering
Dye-sensitized Solar Cells
Type
journal article