Gao Song, Fan Rui Qing, Wang Xin Ming, Qiang Liang Sheng, Wei Li Guo, Wang Ping, Yang Yu Lin, Wang Yu Lei
Department of Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China.
Dalton Trans. 2015 Nov 7;44(41):18187-95. doi: 10.1039/c5dt02951a. Epub 2015 Sep 30.
This work reports on two new complexes with the general formula [Cd3(IBA)3(Cl)2(HCOO)(H2O)]n (1) and {[Cd1.5(IBA)3(H2O)6]·3.5H2O}n (2), which can be synthesized by the reaction of Cd(II) with rigid linear ligand 4-HIBA containing imidazolyl and carboxylate functional groups [4-HIBA = 4-(1H-imidazol-1-yl)benzoic acid]. Single-crystal X-ray diffraction analyses indicate that complex 1 is a 2D "wave-like" layer structure constructed from trinuclear units and complex 2 is just a mononuclear structure. Surprisingly, both complexes 1 and 2 appear as a 3D supramolecular network via intermolecular hydrogen bonding interactions. What's more, due to their strong UV-visible absorption, 1 and 2 can be employed as co-sensitizers in combination with N719 to enhance dye-sensitized solar cell (DSSC) performance. Both of them could overcome the deficiency of the ruthenium complex N719 absorption in the region of ultraviolet and blue-violet, and the charge collection efficiency is also improved when 1 and 2 are used as co-sensitizers, which are all in favor of enhancing the performance. The DSSC devices using co-sensitizers of 1/N719 and 2/N719 show an overall conversion efficiency of 8.27% and 7.73% with a short circuit current density of 17.48 mA cm(-2) and 17.39 mA cm(-2), and an open circuit voltage of 0.75 V and 0.74 V, respectively. The overall conversion efficiency is 27.23% and 18.92% higher than that of a device solely sensitized by N719 (6.50%). Consequently, the prepared complexes are high efficiency co-sensitizers for enhancing the performance of N719 sensitized solar cells.
本工作报道了两种通式为[Cd3(IBA)3(Cl)2(HCOO)(H2O)]n (1) 和{[Cd1.5(IBA)3(H2O)6]·3.5H2O}n (2)的新型配合物，它们可通过Cd(II)与含有咪唑基和羧基官能团的刚性线性配体4-HIBA[4-HIBA = 4-(1H-咪唑-1-基)苯甲酸]反应合成。单晶X射线衍射分析表明，配合物1是由三核单元构建的二维“波浪状”层状结构，配合物2只是单核结构。令人惊讶的是，配合物1和2通过分子间氢键相互作用均呈现出三维超分子网络结构。此外，由于它们具有强烈的紫外-可见吸收，1和2可作为共敏化剂与N719结合使用，以提高染料敏化太阳能电池（DSSC）的性能。它们都能克服钌配合物N719在紫外和蓝紫区域吸收的不足，并且当1和2用作共敏化剂时，电荷收集效率也得到提高，所有这些都有利于提高性能。使用1/N719和2/N719共敏化剂的DSSC器件的总转换效率分别为8.27%和7.73%，短路电流密度分别为17.48 mA cm(-2)和17.39 mA cm(-2)，开路电压分别为0.75 V和0.74 V。总转换效率分别比仅由N719敏化的器件（6.50%）高27.23%和18.92%。因此，所制备的配合物是用于提高N719敏化太阳能电池性能的高效共敏化剂。
