57666-62-3Relevant articles and documents
A co-sensitized approach to efficiently fill the absorption valley, avoid dye aggregation and reduce the charge recombination
Luo, Junsheng,Wan, Zhongquan,Jia, Chunyang,Wang, Yan,Wu, Xiaochun
, p. 506 - 514 (2016)
Compared with the development of novel organic dyes, co-sensitization is a much more convenient way to achieve highly efficient dye-sensitized solar cells (DSSCs). Here, two simple donor-(π conjugated spacer)-acceptor dyes, in which hexyloxy-substituted phenyl as an electron donor, cyanoacrylic acid as the electron acceptor and different spacers thiophene (LD03) or furan (LD04) as the π-linkers, were designed and synthesized as co-sensitizers for N719-based DSSCs. The photophysical, electrochemical, photovoltaic performances and electrochemical impedance spectroscopy of these DSSCs were investigated in detail. When compared to the DSSCs fabricated from individual N719, the co-sensitized DSSCs (N719?+?LD03 and N719?+?LD04) showed significantly enhanced power conversion efficiencies (PCEs), short-circuit photocurrent density (Jsc) and open circuit voltage (Voc) simultaneously, which owing to the co-sensitizers could effectively overcome the competitive light absorption by I3? in the electrolyte, avoid dye aggregation and reduce the charge recombination. Consequently, the co-sensitized DSSC (N719?+?LD04) gave the highest PCE of 8.955% (Jsc?=?17.628?mA?cm?2,?Voc?=?0.758?V and fill factor?=?0.670), exhibiting an improvement of 13.412% compared to the device sensitized with N719 alone (PCE?=?7.896%) under illumination (AM 1.5G, 100?mW?cm?2).
