淡江大學機構典藏:Item 987654321/76964
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 60861/93638 (65%)
造訪人次 : 1105243      線上人數 : 37
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/76964


    題名: DFT and TD-DFT investigations of metal-free dye sensitizers for solar cells: Effects of electron donors and π-conjugated linker
    作者: Tai, Chin-kuen;Chen, Yu-jung;Chang, Hung-wei;Yeh, Pao-ling;Wang, Bo-cheng
    貢獻者: 淡江大學化學學系
    關鍵詞: Electron donating effect;π-Conjugated linker effect;DSSC;Absorption spectrum
    日期: 2011-03
    上傳時間: 2012-05-23 11:18:31 (UTC+8)
    出版者: Amsterdam: Elsevier BV
    摘要: In this study, we have designed a series of metal-free organic D-π-A (electron donor-π-conjugated-acceptor) dyes employed in dye-sensitized solar cells (DSSCs). The optimized structures and photo-physical properties of these dyes have been investigated by using the density functional theory (DFT/B3LYP/6-31G(d)) method. These dyes consist of electron-donor (triphenylamine, coumarine, fluorene, etc) and -acceptor/anchoring (cyanoacrylic), connected by the π-conjugated linker as an electron spacer. In particular, both electron-donor and π-conjugated linkers are important and make impact on the performance of the dyes in the DSSCs. Computational analysis have indicated that a dye with stronger electron-donating group enhances the HOMO energy as compared to a weaker electron-donating group. The time-dependent density functional theory (TD-DFT) method has also been performed to calculate the electronic absorption spectra of these dyes. Two major absorption peaks have been obtained for metal-free organic dyes in the visible region. One is assigned to the intra-molecular charge transfer (ICT) band at 590–770 nm and the other absorption peak is associated with the π → π∗ transition of the entire molecule. The π-conjugated linkers with electron-withdrawing substituents have been shown to generate a slightly blue-shifted absorption band as compared to those without any substituent. The Natural Bond Orbital (NBO) analysis for organic dyes has also been revealed that the origin of charge-transfer arises from electron-donating group to electron-withdrawing moiety. The projected density of state (PDOS) analysis for these dyes depicts that the electron density of HOMO is located at the electron-donating group and it has also been extended to the π-conjugated linker. The electron density of LUMO is concentrated at the π-conjugated linker and at the electron-withdrawing moiety. The computed results suggest that the intermolecular charge-transfer mechanism is operative in these D-π-A dyes when applied to DSSC.
    關聯: Computational and Theoretical Chemistry 971(1–3), pp.42–50
    DOI: 10.1016/j.comptc.2011.05.036
    顯示於類別:[化學學系暨研究所] 期刊論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML29檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋