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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Fabrication and charge/energy-transfer study of 4,7-bis(4-triphenylamino) benzo-2,1,3-thiadiazole/CuPc composite films
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Fabrication and charge/energy-transfer study of 4,7-bis(4-triphenylamino) benzo-2,1,3-thiadiazole/CuPc composite films

机译：4,7-双（4-三苯基氨基）苯并-2,1,3-噻二唑/ CuPc复合薄膜的制备及电荷/能量转移研究

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摘要

Composite films of 4,7-bis(4-triphenylamino)benzo-2,1,3-thiadiazole (TBT) and copper phthalocyanine (CuPc) are fabricated via protonation- coelectrophoretic deposition from nitromethane solutions of TBT/CuPc mixture in the presence of trifluoroacetic acid as a protonation reagent. A nanospheres-nanowires interpenetrating network structure is obtained when the molar percentage of TBT is 70%. Furthermore, the existence of TBT makes α-phased CuPc be partly transformed into the β-phase, and simultaneously, CuPc disorganizes the TBT unit cells. The blue shift on the absorption edge of TBT and the significant fluorescence quenching in the composite films indicate energy/charge transfer and donor-acceptor (D-A) heterojunction formation. Then these results are proved from another point of view: the mutual overlap of absorption and emission spectra of TBT and CuPc lead to a bidirectional F?rster resonance energy transfer at the interface; the molecular energy levels calculated from the results of cyclic voltammetry theoretically determine that there exist a D-A heterojunction and charge transfer from TBT to CuPc. Finally, from the investigation of the field-induced surface photovoltage spectra, it can be concluded that this charge transfer results in efficient dissociation of the photoinduced excitons in the composite films, followed by the generation of a strong photovoltage response.
机译：在乙腈的存在下，通过TBT / CuPc混合物的硝基甲烷溶液的质子化-共电泳沉积制备4,7-双（4-三苯基氨基）苯并-2,1,3-噻二唑（TBT）和酞菁铜（CuPc）的复合膜。三氟乙酸作为质子化剂。当TBT的摩尔百分比为70％时，获得了纳米球-纳米线互穿网络结构。此外，TBT的存在使得α相的CuPc部分地转变成β相，同时CuPc使TBT的晶胞分裂。 TBT吸收边缘的蓝移和复合膜中明显的荧光猝灭表明能量/电荷转移和施主-受主（D-A）异质结的形成。然后从另一个角度证明了这些结果：TBT和CuPc的吸收和发射光谱的相互重叠导致在界面处的双向Fsterster共振能量转移。从循环伏安法的结果计算出的分子能级理论上确定存在D-A异质结，并且从TBT到CuPc的电荷转移。最后，从对场感应的表面光电压谱的研究可以得出结论，这种电荷转移导致复合膜中光感应激子的有效离解，随后产生强的光电压响应。

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