Synthesis Of Organic Photosensitizer Based On Indoline And Application In DSSCs

Solar energy is one kind of clean with no pollution and renewable energy. There are some advantages for solar energy like easily design, low cost and no restriction with gegion. In1991the Sweden professor Michael Gratzel reported the dye-sensitized solar cells (DSSCs) firstly, then it has become the focus of public concern. With respect to traditional solarcells, for its special charactors, DSSC have a rapid development. Photosensitizers is part of the core component of DSSC, whether designing and synthesizing a high performance photosensitizer directly affect the level of DSSC.In this paper We synthesized four organic dyes. which consisting of a indoline unit. Meanwhile we investigated the photophysical and electrochemical properties of these four dyes. These are main contents:1. Four new dyes were been designed and synthesized, All of them include a indoline unit. four indoline dyes (XS41, XS42, XS43and XS44) featuring respective dipropylfluorene, hexyloxybenzene, tert-butylbenzene and hexapropyltruxene electron donors have been engineered, melt thiophene as the bridge and cyano acetic acid to be the acceptor, the new type of D-Ï€-A have been done. Form the simply material, through NBS or Br2/Suzuki/Stille/VH and Knoevenagel rection to given the end chemicals. IR,13C NMR,1H NMR and MS were introduced to investigate the final compounds. The photophysical and electrochemical properties of XS41-44were investigated. it is necessary to be as a sensitizer.2. the photovoltaic properties of these four dyes(XS41-44)aslo has been studied, the order of Voc:XS42(621mV)<XS43(633mV)<XS41(670mV)<XS44(725mV), The incorporation of bulky rigid groups can notably retard the elector recombination on the interface between.titania and electrolyte.Moreover, we have developed two organic dyes (TC1and TC2) as alternative coadsorbent to chenodeoxycholic acid (CDCA). Dependence of photovoltage on the length of TC1/TC2was investigated. Interestingly, it is found that regardless of the dye selection, coadsorption with TC2confers an improved Voc as well as Jsc in comparison with its TC1analogues because of molecular matching in length. Importantly, combining the two contributions, very high Voc in DSCs based on indoline dyes can be realized without sacrificing Jsc.4. In order to demonstrat that very high Voc can be realized without sacrificing Jsc by employing indoline dyes featuring bulky rigid donor combined with a matched coadsorbent., the electrochemical impedance spectroscopy, electron lifetime, the structure of the molecules, The simple sketch map of the adsorbed XS41+TC1and XS41+TC2on the TiO2surface has been furher studied. for the best condition,Upon coadsorption with TC2, XS41produces a Jsc of16.1mAcm-2, a Voc of770mV, ff of0.66, power conversion efficiency of8.18%. These findings pave a new way to achieve further efficiency enhancement of indoline dyes..