A series of porphyrin dyes with an electron-donating group (EDG) attached at a meso-position (YD1–YD8) have been designed and synthesized for use as sensitizers in dye-sensitized solar cells (DSSC). The nature of the EDG exerts a significant influence on the spectral, electrochemical and photovoltaic properties of these sensitizers. Absorption spectra of porphyrins having an amino group show broadened Soret band and red-shifted Q bands with respect to those of reference porphyrin YD0. This phenomenon is more pronounced for porphyrins YD7 and YD8 that have a π-conjugated triphenylamine at the meso-position opposite the anchoring group. Upon introduction of an EDG at the meso-position, the potential for the first oxidation alters significantly to the negative whereas that for the first reduction changes inappreciably, indicating a decreased HOMO-LUMO gap. Results of density-functional theory (DFT) calculations support the spectroelectrochemical data for a delocalization of charge between the porphyrin ring and the amino group in the first oxidative state of diarylamino-substituted porphyrins YD1–YD4, which exhibit superior photovoltaic performance among all porphyrins under investigation. With long-chain alkyl groups on the diarylamino substituent, YD2 shows the best cell performance with JSC = 13.4 mA cm−2, VOC = 0.71 V, and FF = 0.69, giving an overall efficiency 6.6% of power conversion under simulated one-sun AM1.5 illumination.
设计并合成了一系列在中间位(YD1-YD8)连接有供电子基团(EDG)的
卟啉染料,用作
染料敏化太阳能电池(DSSC)中的敏化剂。 EDG 的性质对这些敏化剂的光谱、电
化学和光伏特性产生重大影响。相对于参考
卟啉YD0,具有
氨基的
卟啉的吸收光谱显示出加宽的Soret带和红移的Q带。对于在与锚定基团相对的中间位置具有π-共轭
三苯胺的
卟啉YD7和YD8,这种现象更为明显。在中间位置引入 EDG 后,第一次氧化的电势显着变为负值,而第一次还原的电势变化不大,表明 HOMO-LUMO 间隙减小。密度泛函理论(DFT)计算的结果支持了二芳基
氨基取代的
卟啉YD1-Y
D4在第一氧化态下
卟啉环和
氨基之间电荷离域的光谱电
化学数据,在所有
卟啉中表现出优异的光伏性能。调查。由于二芳基
氨基取代基上有长链烷基,YD2 显示出最佳的电池性能,JSC = 13.4 mA cm−2、VOC = 0.71 V 和 FF = 0.69,在模拟单太阳下的总功率转换效率为 6.6%
AM1.5照明。