31486-86-9Relevant articles and documents
Synthesis and evaluation of simple molecule as a co-adsorbent dye for highly efficient co-sensitized solar cells
Zhu, Shengbo,An, Zhongwei,Sun, Xiao,Wu, Zhisheng,Chen, Xinbing,Chen, Pei
, p. 85 - 92 (2015)
One simple-structure dye and two bulky dyes have been designed for exploring a new co-sensitization system utilizing synergy between simple-structure and bulky organic dyes. This small-sized dye molecule can fill up the space defects between bulky dyes, and its strong absorption band from 350 to 500 nm can complement the absorption valleys of the bulky dyes. Additionally, the dye loading of titanium dioxide surface was investigated by Thermogravimetric analysis, which confirms that the molar loading of co-sensitized device has significantly increased. These results exhibit that the simple molecule can be used not only as a co-adsorbent to inhibit charge recombination and π-π aggregation between the bulky dyes but also as a co-sensitizer to improve light-harvesting ability.
Rigid triarylamine-based D-A-π-A structural organic sensitizers for solar cells: The significant enhancement of open-circuit photovoltage with a long alkyl group
Hu, Xiaohao,Cai, Shengyun,Tian, Guojian,Li, Xin,Su, Jianhua,Li, Jing
, p. 22544 - 22553 (2013)
Five new organic D-A-π-A sensitizers DIA6-DIA10 containing benzothiadiazole (BTD) or benzotriazole (BTZ) as auxiliary electron withdrawing units have been synthesized. Their photophysical, electrochemical and photovoltaic properties have been studied. Consequently, although all of these dyes have long alkyl chains grafted on a π-bridge, DSSCs with dyes containing a BTZ unit displayed higher open circuit voltages (757-829 mV) than those containing a BTD unit (682-712 mV). This may be because the nitrogen-based heterocyclic group of BTZ can lift the conduction band edge and reduce the charge recombination that arises from the absence of the sulfur atom. Benefiting from this and the introduction of alkyl chains on the nitrogen atom, DSSCs with one dye containing BTZ and thieno[3,2-b]thiophene (TT) as the π-spacer (DIA7) showed the highest open circuit voltage (Voc = 829 mV). The addition of one more thiophene unit to DIA6 broadens the absorption spectra, leading the DIA8 device to produce the largest photocurrent. Among these sensitizers, the best photovoltaic performance was obtained by the DIA8 device, with a short circuit photocurrent density (Jsc) of 13.45 mA cm -2, an open-circuit photovoltage (Voc) of 757 mV, and a fill factor (FF) of 70%, corresponding to an overall conversion efficiency (η) of 7.15% which reached 93% of the reference dye N719-based cell under standard global AM 1.5 solar light conditions. The Royal Society of Chemistry 2013.
Small isomeric push-pull chromophores based on thienothiophenes with tunable optical (non)linearities
Podlesny, Jan,Pytela, Old?ich,Klikar, Milan,Jelínková, Veronika,Kityk, Iwan V.,Ozga, Katarzyna,Jedryka, Jaroslaw,Rudysh, Myron,Bure?, Filip
, p. 3623 - 3634 (2019/04/14)
Fourteen new D-π-A push-pull chromophores based on two isomeric thienothiophene donors and seven acceptors of various electronic natures have been designed and conveniently synthesized. In contrast to known thienothiophene push-pull molecules, the prepared small chromophores proved to be organic materials with easily tunable thermal, electrochemical and (non)linear optical properties. It has also been shown that small structural variation may result in significantly improved/varied fundamental properties. Very detailed structure-property relationships were elucidated within the systematically developed series of push-pull molecules, which may serve as a useful guide in designing new D-π-A molecules based on fused thiophene scaffolds.
Influence of a π-bridge dependent molecular configuration on the optical and electrical characteristics of organic solar cells
Wang, Ting,Han, Liangliang,Wei, Huan,Zhu, Dangqiang,Bao, Xichang,Qiao, Shanlin,Sun, Weizhi,Chen, Weichao,Yang, Renqiang
, p. 8784 - 8792 (2016/07/06)
A new solution processed A-π-D-π-A type small molecule denoted as DCATT-L has been synthesized as a donor for bulk-heterojunction (BHJ) solar cells. Compared with its isomer DCATT, reported in our previous work, DCATT-L possesses the same building blocks, but different π-bridge configurations and hence different backbone configurations. Changing the π-bridge with delicate designs, the absorption coefficient is increased significantly and the highest occupied molecular orbital (HOMO) energy level is decreased by 0.1 eV. The excellent optical and electrical properties of DCATT-L guarantee the enhancement of power conversion efficiency (PCE) to 7.72%, compared with that of DCATT (5.20%), with simultaneously increasing open-circuit voltage, short-circuit current density and fill factor.
