A near-infrared dye for dye-sensitized solar cell: Catecholate-functionalized zinc phthalocyanine

作者：Sarker Ashis K; Kang Man Gu; Hong Jong Dal^*

来源：Dyes and Pigments, 2012, 92(3): 1160-1165.

DOI：10.1016/j.dyepig.2011.07.002

• Catechol-functionalized zinc phthalocyanine
• NIR dyes
• Dye-sensitized solar cell
• Anchoring groups
• Photovoltaic windows

The design and synthesis of an asymmetrical zinc phthalocyanine sensitizer modified with a catechol anchoring group is reported. The performance of this sensitizer was evaluated in a dye-sensitized solar cell. A strong interaction between the catechol dye and TiO(2) (with the formation of a five-membered charge-transfer complex) was evidenced by a strong shift in the Q-band of the ZnPc-Cat from 680 nm in solution to 750 nm on TiO(2), along with an appreciable absorption tail extending to similar to 1000 nm. The fabricated solar cell containing the phthalocyanine sensitizer showed relatively high light-to-electron conversion efficiency (eta = 0.92%), considering that few catechol dyes exceed eta = 0.7% in dye-sensitized solar cells. Values of I(SC) = 2.53 mA cm(-2) and V(OC) = 540 mV were obtained, referring to a standard N719 cell (eta = 6.46%). A comparison of zinc phthalocyanine sensitizers bearing different anchoring groups affirmed the superiority of carboxylate groups relative to those bearing catechol groups in terms of cell performance.

• 出版日期2012-3