Chemical compatibility between a hole conductor and organic dye enhances the photovoltaic performance of solid-state dye-sensitized solar cells
作者:Young Soo Kwon、Jongchul Lim、Inwoo Song、In Young Song、Won Suk Shin、Sang-Jin Moon、Taiho Park
DOI:10.1039/c2jm30215b
日期:——
A series of organic dyes having an unsymmetrical geometry, 3-(5′-4-[(4-tert-butyl-phenyl)-(4-fluoro-phenyl)-amino]-phenyl}-[2,2′]bithio-phenyl-5-yl)-2-cyano-acrylic acid (D-F), 3-(5′-4-[(4-tert-butyl-phenyl)-p-tolyl-amino]-phenyl}-[2,2′] bithiophenyl-5-yl)-2-cyano-acrylic acid (D-CH33), and 3-(5′-4-[(4-tert-butyl-phenyl)-(4-methoxy-phenyl)-amino]-phenyl}-[2,2′]bithiophenyl-5-yl)-2-cyano-acrylic acid (D-OCH3), were designed and synthesized for use in solid-state dye-sensitized solar cells (sDSCs). The dye regeneration energy levels and surface properties were characterized to determine the hole transfer yield from the oxidized dye to the hole conductor (spiro-OMeTAD) by measuring the degree of pore-filling by the spiro-OMeTAD and the transient absorption spectra (TAS). An electrode sensitized with D-OCH3 exhibited the highest spiro-OMeTAD filling fraction and hole transfer quantum yield (Φ) to spiro-OMeTAD, resulting in an enhanced photocurrent and a power conversion efficiency of 3.56% in the sDSC, despite a lower energy driving force for hole transfer compared to those of D-F, or D-CH33. This result illustrates the importance of the chemical compatibility between the hole conductor and the dye on the surface of TiO2.
一系列具有不对称结构的有机染料被设计和合成,用于固态染料敏化太阳能电池(sDSCs)。这些染料包括:
1. 3-(5′-4-[(4-叔丁基苯基)-(4-氟苯基)-氨基]-苯基}-[2,2′]联噻吩-5-基)-2-氰基丙烯酸(D-F)
2. 3-(5′-4-[(4-叔丁基苯基)-对甲苯基-氨基]-苯基}-[2,2′]联噻吩-5-基)-2-氰基丙烯酸(D-CH33)
3. 3-(5′-4-[(4-叔丁基苯基)-(4-甲氧基苯基)-氨基]-苯基}-[2,2′]联噻吩-5-基)-2-氰基丙烯酸(D-OCH3)
研究通过测量空穴传导体(spiro-OMeTAD)的孔隙填充度和瞬态吸收光谱(TAS),表征了染料再生能级和表面性质,以确定氧化染料向空穴传导体的空穴转移产率。
尽管D-OCH3的空穴转移驱动力较D-F或D-CH33低,但经D-OCH3敏化的电极表现出最高的spiro-OMeTAD填充分数和空穴转移量子产率(Φ),使sDSC的光电流得到提升,能量转换效率达到3.56%。
这一结果说明了空穴传导体与二氧化钛表面染料之间的化学相容性的重要性。