染料敏化太陽能電池(Dye-sensitized Solar Cells，DSC)是具有高度應用潛力的新世代光伏技術，為拓展其應用性，提高元件的光電轉換效率一直是研發重點；2012年Black dye搭配Y1共敏化元件除了創下新的光電轉換效率紀錄(11.4%)，也提供一個好的電池性能改善方法。本研究以Y1為雛型設計合成四個新的有機共吸附染料(Co-Adsorption Dyes；代號分別為CAD-1、CAD-3、CAD-5及CAD-7)，以提高實驗室先前研發的釕錯合物染料CYC-37敏化元件效能。CADs系列分子於DMF溶液態的最大吸收波長較Y1紅位移至少34 nm，莫爾吸收係數也皆高於Y1的31000 M-1 cm-1。元件初步測試結果顯示，縮短CYC-37敏化電極於CADs溶液的後敏化浸泡時間以降低分子聚集，CADs的高吸光特性可以有效提高CYC-37敏化元件於波長範圍370 ~ 560 nm的光電轉換效能；相較於單獨使用CYC-37敏化的電池，使用CAD-3後敏化0.5小時可大幅增加元件對470 nm光子的轉換能力達14.4% (相同條件下Y1後敏化電池僅上升4.7%)。在AM 1.5G模擬太陽光照射下，CAD-3後敏化電池的短路電流密度為17.63 mA cm-2，優於CYC-37單一敏化元件以及Y1後敏化電池的表現。本研究不僅可作為後續設計高效能有機共吸附染料的基礎，也為未來後敏化元件製程優化提供明確的指引。;Dye-sensitized solar cells (DSCs) are promising photovoltaic technology. For broadening the applications, increasing the power conversion efficiency (PCE) of devices is important. In 2012, the device co-sensitized with Black dye and Y1 reaching a record-high PCE of 11.4% demonstrated a good approach to improve the PCE. In this research, we design four new co-adsorption organic dyes (coded CAD-1, CAD-3, CAD-5 and CAD-7) based on Y1 to increase the PCE of devices sensitized with CYC-37 (a ruthenium complex we previously developed). Compared with Y1, the absorption maximum (max) of CADs in DMF red-shifts over 34 nm, and the molar absorption coefficient is larger than 31000 M-1 cm-1. The preliminary results of the devices sensitized with CYC-37 and CADs show that CADs exhibiting high light-harvesting capacity can significantly enhance the incident photon-to-current conversion (IPCE) performance in the wavelength range of 370 ~ 560 nm. Compared with the cell based only on CYC-37, the device post-sensitized with CAD-3 for 0.5 hour increases 14.4% of the IPCE efficiency at 470 nm, superior to that of co-sensitizer Y1 (4.7%). Under the illumination of AM 1.5G simulated sunlight, the device post-sensitized with CAD-3 yields the short-circuit current density of 17.63 mA cm-2, higher than that those of CYC-37 based device and Y1 post-treated cell. The new results of this research provide not only the basis for designing efficient co-adsorption dyes, but also the guidelines of optimizing post-sensitization processes.
