Efficient and stable DSSC sensitizers based on substituted dihydroindolo[2,3-b]carbazole donors with high molar extinction coefficients
作者:Shengyun Cai、Guojian Tian、Xin Li、Jianhua Su、He Tian
DOI:10.1039/c3ta11748k
日期:——
Four novel metal-free organic sensitizers based on 5,7-dihexyl-6,12-diphenyl-5,7-dihydroindolo[2,3-b]carbazole (DDC) donors have been synthesized. Their optical/electrochemical properties, dye-sensitized solar cell (DSSCs) performances and photo-stability upon successive irradiation for 30 min have been investigated. The optical data indicates that all these dyes showed a high molar extinction coefficient (5.6–6.3 × 104 M−1 cm−1). Under standard global AM 1.5 solar light condition, the DDC4 sensitized cell gave a short circuit photocurrent density (Jsc) of 14.81 mA cm−2, an open circuit voltage (Voc) of 0.688 V, and a fill factor (FF) of 0.69, corresponding to an overall efficiency (η) of 7.03%. The benzothiadiazole units and thieno[3,2-b]thiophene (TT) in the π spacer were found to increase the photo-stability of the corresponding dyes and these dyes based on this donor are promising candidates for the further application in DSSCs.
四种基于5,7-二己基-6,12-二苯基-5,7-二氢吲哚[2,3-b]咔唑(DDC)供体的金属自由有机敏化剂已被合成。研究了它们的光学/电化学性质、染料敏化太阳能电池(DSSCs)性能以及在连续辐照30分钟后的光稳定性。光学数据表明,这些染料均表现出高摩尔消光系数(5.6–6.3 × 10^4 M−1 cm−1)。在标准全球AM 1.5太阳光条件下,DDC4敏化的电池给出了短路光电流密度(Jsc)为14.81 mA cm−2,开路电压(Voc)为0.688 V,以及填充因子(FF)为0.69,对应的总体转换效率(η)为7.03%。发现苯并硫氮杂环单元和噻吩[3,2-b]噻吩(TT)在π间隔中的存在提高了相应染料的光稳定性,这些基于该供体的染料是进一步在DSSCs中应用的有希望的候选者。