Two-Dimensional Polyfluorenes Bearing Thienylenevinylene π-Bridge-Acceptor Side Chains for Photovoltaic Solar Cells

Zhu, Enwei; Hai, Jiefeng; Wang, Zixuan; Ni, Bin; Jiang, Yaohua; Bian, Linyi; Zhang, Fujun; Tang, Weihua

doi:10.1021/jp4072718

Cited by 20 publications

(11 citation statements)

References 51 publications

(93 reference statements)

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“…The rather high V oc values of 2-D BDT SMs are attributed to their lower-lying HOMO level ( Table 1 ). More importantly, the 2-D BDT based SM-OSCs exhibited much improved J sc and FF values than DR3TBDTOC12 devices, indicating the beneficial of conjugated side-chains in promoting anisotropic charge transportation in active layer 24 39 .…”

Section: Resultsmentioning

confidence: 96%

Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Yin

et al. 2016

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Three novel small molecules have been developed by side-chain engineering on benzo[1,2-b:4,5-b’]dithiophene (BDT) core. The typical acceptor-donor-acceptor (A-D-A) structure is adopted with 4,8-functionalized BDT moieties as core, dioctylterthiophene as π bridge and 3-ethylrhodanine as electron-withdrawing end group. Side-chain engineering on BDT core exhibits small but measurable effect on the optoelectronic properties of small molecules. Theoretical simulation and X-ray diffraction study reveal the subtle tuning of interchain distance between conjugated backbones has large effect on the charge transport and thus the photovoltaic performance of these molecules. Bulk-heterojunction solar cells fabricated with a configuration of ITO/PEDOT:PSS/SM:PC71BM/PFN/Al exhibit a highest power conversion efficiency (PCE) of 6.99% after solvent vapor annealing.

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Section: Resultsmentioning

confidence: 96%

Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Yin

et al. 2016

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“…As presented in Fig. 4a, TiO 2 showed no visible-light absorption ability due to its wide-bandgap, while the pure polymers displayed a typical absorption band in UV and visble range and an absorption edge at approximately 650 nm 36,37 . For the 15%C1 and 15% C2 samples, the optical absorption region had a marked widening, which gived the credit to the the polymer.…”

Section: Resultsmentioning

confidence: 99%

A novel Strategy of Lock-in Effect between Conjugated Polymer and TiO2 towards Dramatic Enhancement of Photocatalytic Activity under Visible Light

Liu

Jiang

Song

et al. 2020

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to design novel conjugated polymers and improve interfacial interaction with semiconductor is one of directions to develop high-efficient photocatalysts with harvesting photons and boosting catalytic activities. Herein, two novel linear conjugated polymers poly[(thiophene-ethylene-thiophene)thiophene] (PTET-T) and poly[(thiophene-ethylene-thiophene)-thiophene-3-carboxylic acid] (PTET-T-COOH)were successfully synthesized by a simple Stille coupling reaction. Their heterojunction with tio 2 , i.e, PTET-T/TiO 2 (C1) and PTET-T-COOH/TiO 2 (C2), exhibited outstanding photocatalytic activity for degrading Rhodamine B, methylene blue and tetracycline. The energetic "lock-in effect" between ptet-t-cooH and tio 2 through carboxyl groups and hydroxyl groups interaction has been proved to greatly improve the interface charge transfer ability and suppress the electron-hole recombination in PTET-T-COOH/TiO 2 . Thus, by regulating the dosage of polymers, the 15% PTET-T-COOH/TiO 2 showed the optimized photocatalytic activity with excellent chemical stability, and its kinetic rate constant was determined to be 41.7 times of that of TiO 2 . This work provided a new effective strategy of designed and explored organic semiconductor-inorganic heterojunction photocatalysts with broaden absorption, repeatability and high-charge mobility.environmental governance thanks to their easy to synthesize, long-time stability, high carrier migration efficiency, and controllable narrow band gap. The polythiophene/TiO 2 composites had attracted widespread attention for degradation of various dye [25][26][27][28] , which have been shown to effectively lower the band gap by allowing greater adsorption in the visible region and prevent the recombination of photoelectrons and holes. PTh can be coated on the surface of metal oxides, act easily as a sensitizer to metal oxides 29 . However, the poor stability for long term application was not mentioned in above experiments, or the decolorization rate of organic pollutants was only about 60% after three repetitions. Meanwhile, the wavelength of the conjugated polymer optical response used in the above study is almost below 600 nm, which cannot be effectively utilized in the visible band. Last but not least, the bonding way of polythiophene and TiO 2 heterojunction determines the photogenerated charge separation and transfer capacity. Thus, a wise strategy is necessary to be proposed to construct a novel polymer/TiO 2 composites with the better stability and more effective photocatalytic ability for pollutant removal 30 .The "lock-in effect" has been used for molecular conformation in organic semiconductors. It facilitates the intramolecular delocalization of π-electrons along the backbone, thus enhancing intramolecular charge transfer and reducing the band gap 31 . In our paper, we firstly use "lock-in effect" to open concepts to bridge gaps between the polymer and TiO 2 composites.Herein, we designed and synthesized two novel thiophene-based conjugated polymers poly [(thiophene-ethylene-thiophene)-thiop...

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“…These values are higher than the BHJSC devices fabricated with corresponding OBDT analogue donor materials, which is consistent with their optical and electrochemical properties. The higher PCE for BHJSCs with SBDT‐based donor materials over their OBDT counterparts indicates that conjugated side chains are beneficial in promoting anisotropic charge transport in the active layer . Since the V oc values of these devices are good enough, their poor overall PCE is mainly attributed to the low values of J sc and FF values and it could be related to the poor nanoscale morphology of the active layer.…”

Section: Resultsmentioning

confidence: 99%

Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small‐Molecule Donors for Bulk Heterojunction Solar Cells

et al. 2017

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Small molecule donor materials with varied number of fluorine atoms (zero and four for ICT7 and ICT9, respectively) are synthesized and the influence of the fluorine atom content on their photophysical, electrochemical and thermal properties is studied. With an increase in the number of F atoms, the absorption maximum of the donor material is blue shifted with an increase in the molar extinction coefficient and also, the HOMO (−5.60 and −5.70 eV, respectively, for ICT7 and ICT9) and the LUMO (−3.70 and −3.76 eV, respectively, for ICT7 and ICT9) energy levels are stabilized. Thermal properties, such as melting temperature Tm (223 and 312 °C, respectively, for ICT7 and ICT9) and crystallization temperature Tc (174 and 284 °C, respectively, for ICT7 and ICT9) are significantly enhanced with increasing numbers of fluorine atoms. Solution‐processed bulk heterojunction solar cells (BHJSCs) are fabricated using these two donors along with PC71BM as the acceptor. Under the optimized conditions, they exhibited an overall power conversion efficiency (PCE) of 6.43 % and 8.34 % for ICT7:PC71BM and ICT9:PC71BM active layers, respectively. ICT9 with four F atoms induced a better nanoscale morphology to the active layer, exhibited efficient charge transport and exciton dissociation and resulted in a better PCE of the BHJSCs.

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Two-Dimensional Polyfluorenes Bearing Thienylenevinylene π-Bridge-Acceptor Side Chains for Photovoltaic Solar Cells

Cited by 20 publications

References 51 publications

Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

Side-chain Engineering of Benzo[1,2-b:4,5-b’]dithiophene Core-structured Small Molecules for High-Performance Organic Solar Cells

A novel Strategy of Lock-in Effect between Conjugated Polymer and TiO2 towards Dramatic Enhancement of Photocatalytic Activity under Visible Light

Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small‐Molecule Donors for Bulk Heterojunction Solar Cells

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