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首页> 外文期刊>Journal of King Saud University >Electro-optical and charge injection investigations of the donor-π-acceptor triphenylamine, oligocene–thiophene–pyrimidine and cyanoacetic acid based multifunctional dyes
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Electro-optical and charge injection investigations of the donor-π-acceptor triphenylamine, oligocene–thiophene–pyrimidine and cyanoacetic acid based multifunctional dyes

机译：供体-π-受体三苯胺，低聚茂-噻吩-嘧啶和氰基乙酸基多功能染料的电光和电荷注入研究

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摘要

The corner stone of present study is to tune the electro-optical and charge transport properties of donor-bridge-acceptor (D- π -A) triphenylamine (TPA) derivatives. In the present investigation, an electron deficient moiety (pyrimidine), electron-rich moiety (thiophene) and oligocene (benzene, naphthalene, anthracene, tetracene and pentacene) have been incorporated as π -spacer between the donor TPA unit and cyanoacetic acid acceptor and anchoring group. The elongation of bridge usually affects the energy levels, i.e., higher the highest occupied molecular orbital (HOMO) while lower the lowest unoccupied molecular orbital (LUMO) thus reduces the HOMO–LUMO energy gap. The lowered LUMO energy levels of cyano-{2-[6-(4-diphenylamino-phenyl)-pyrimidin-4-yl]-tetraceno[2,3-b]thiophen-8-yl}-acetic acid (TPA-PTT4) and cyano-{2-[6-(4-diphenylamino-phenyl)-pyrimidin-4-yl]-pentaceno[2,3-b]thiophen-9-yl}-acetic acid (TPA-PPT5) dyes revealed that electron injected from dye to semiconductor surface might be auxiliary stable resulting in impediment of quenching. The broken co-planarity between the π -spacer conceiving LUMO and the TPA moiety would help to impede the recombination process. Moreover, it is expected that TPA derivatives with the tetracenothiophene and pentacenothiophene moieties as π -bridge would show better photovoltaic performance due to lowered LUMO energy level, higher electronic coupling constant, light harvesting efficiency and electron injection values.
机译：本研究的基石是调整供体桥受体（D-π-A）三苯胺（TPA）衍生物的电光和电荷传输性能。在本研究中，在供体TPA单元和氰基乙酸受体之间，以π间隔剂的形式引入了缺电子部分（嘧啶），富电子部分（噻吩）和茂新苯（苯，萘，蒽，并四苯和并五苯）。锚定组。桥的伸长通常会影响能级，即，较高的最高占据分子轨道（HOMO）较高，而最低的最低未占据分子轨道（LUMO）较低，从而减小了HOMO-LUMO的能隙。氰基-{2- [6- [6-（4-二苯基氨基-苯基）-嘧啶-4-基]-四traceno [2,3-b]噻吩-8-基}-乙酸（TPA-PTT4）的LUMO能级降低）和氰基-{2- [6- [4-（4-二苯基氨基-苯基）-嘧啶-4-基]-戊基[2,3-b]噻吩-9-基}-乙酸（TPA-PPT5）染料显示从染料注入到半导体表面的电子可能是辅助稳定的，从而导致猝灭的障碍。包含LUMO的π间隔子和TPA部分之间破裂的共面性将有助于阻止重组过程。此外，由于具有较低的LUMO能级，较高的电子耦合常数，光收集效率和电子注入值，预期具有四乙炔噻吩和戊乙噻吩部分作为π-桥的TPA衍生物将表现出更好的光伏性能。

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