Enhanced performance of ruthenium dye-sensitized solar cell by employing an organic co-adsorbent of N,N’-bis((pyridin-2-yl)(methyl) methylene)-o-phenylenediamine

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• 作者：Yang Xu^a ; Liang-Sheng Qiang^a ; Yu-Lin Yang^a ; ^{ylyang@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Li-Guo Wei^a ; ^b ; Ping Wang^a ; Rui-Qing Fan^a ; ^{fanruiqing@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dye-sensitized solar cells ; Co-adsorbent ; Enhanced performance ; Co-sensitization
• 刊名：Chinese Chemical Letters
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：27
• 期：1
• 页码：127-134
• 全文大小：834 K

文摘

A pyridine-anchor co-adsorbent of N,N’-bis((pyridin-2-yl)(methyl) methylene)-o-phenylenediamine (named BPPI) is prepared and employed as co-adsorbent in dye-sensitized solar cells (DSSCs). The prepared co-adsorbent could overcome the deficiency of N719 absorption in the low wavelength region of visible spectrum, offset competitive visible light absorption of I₃⁻, enhance the spectral responses of the co-adsorbed TiO₂ film in region from 300 nm to 750 nm, suppress charge recombination, prolong electron lifetime, and decrease the total resistance of DSSCs. The optimized cell device co-sensitized by BPPI/N719 dye gives a short circuit current density of 12.98 mA cm⁻², an open circuit voltage of 0.73 V, and a fill factor of 0.66 corresponding to an overall conversion efficiency of 6.22% under standard global AM 1.5 solar irradiation, which is much higher than that of device solely sensitized by N719 (5.29%) under the same conditions. Mechanistic investigations are carried out by various spectral and electrochemical characterizations.