A New Electron Acceptor with <i>meta</i>‐Alkoxyphenyl Side Chain for Fullerene‐Free Polymer Solar Cells with 9.3% Efficiency

Zhang, Zhenzhen; Feng, Li-Hao; Xu, Shengmin; Liu, Ye; Peng, Hongjian; Zhang, Zhiguo; Li, Yongfang; Zou, Yingping

doi:10.1002/advs.201700152

Cited by 41 publications

(23 citation statements)

References 52 publications

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“…For the device prepared without TMB, polymer is easy to crystallize because CB is an easy volatile solvent, and the polymers are prone to form network first, then IT4F is restricted by the crystallized network as shown in Figure S6a, Supporting Information. This structure will seriously deteriorate the carrier transport efficiency because of bimolecular recombination . With 20 vol% low‐volatile TMB, the crystallization rate decreased.…”

Section: Resultsmentioning

confidence: 99%

Intensification of Vertical Phase Separation for Efficient Polymer Solar Cell via Piecewise Spray Assisted by a Solvent Driving Force

et al. 2020

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Piecewise spray has the advantage of controlling the component distribution, i.e., constructing vertical phase‐separated active layers, to improve the charge generation efficiency of large‐scale polymer solar cells. However, it brings a connection problem because of the drastic difference in the donor/acceptor ratio of continuous coatings using the conventional solvent. Assisted by 1,3,5‐trimethylbenzene‐based solvent engineering, a solvent driving force is formed, resulting in a continuous interface for piecewise spray‐coated active layers. The blend film forms a bicontinuous interpenetrating network in the active layer and provides efficient percolation pathways for charge carrier transport, resulting in a considerable improvement in the photovoltaic performance. When the donor/acceptor ratio is 1:2 in the first coating and 2:1 in the second coating, and the thickness of each coating is 90 nm, the performance of the PBDB‐T‐2Cl:IT4F photovoltaic device shows a notable conversion efficiency of 12.29% with a high short‐circuit current density of 21.55 mA cm−2. Importantly, this piecewise spray technique can be used for large‐scale module fabrication.

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Section: Resultsmentioning

confidence: 99%

Intensification of Vertical Phase Separation for Efficient Polymer Solar Cell via Piecewise Spray Assisted by a Solvent Driving Force

et al. 2020

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“…For excitation at the corresponding maximum absorption wavelength, IT(2FBT-T3Cz) 2 and IT(2FBT-TT3Cz) 2 exhibited a maximum emission band in 659 nm and 695 nm, respectively, while the PL of the IT(2FBT-T3Cz) 2 and IT(2FBT-TT3Cz) 2 was thoroughly quenched in the blend films. This PL quenching phenomenon indicated the efficient charge transfer from the IT(2FBT-T3Cz) 2 and IT(2FBT-TT3Cz) 2 to PC 71 BM and favorable exciton dissociation in their films [32] .…”

Section: Electrochemical Propertiesmentioning

confidence: 95%

High-performance asymmetric small molecular donor materials based on indenothiophene for solution-processed organic solar cells

Tan

Zhang

et al. 2019

Journal of Energy Chemistry

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“…Zou synthesized an acceptor m‐ITIC‐OR ( 4.10 ) by replacing the hexyl chain on m‐ITIC with alkoxy one. OSCs containing the m‐ITIC‐OR : HFQx‐T ( 2.20 ) blend films afforded a PCE of 9.3 % without using additives . It has been proved that the introduction of alkoxy side chain could upshift the energy level, and at the same time enhance the intramolecular interaction, thus increasing crystallinity and charge mobility of the resulting polymers.…”

Section: Nfsmas For Additive‐free Oscsmentioning

confidence: 99%

Additive‐Free Non‐Fullerene Organic Solar Cells

et al. 2019

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With the extensive research efforts paid over the past 30 years, the power conversion efficiency of organic solar cells (OSCs) has been steadily improved from below 1 % to greater than 16 %. While fullerene derivatives have traditionally played a dominant role as acceptor materials in the first two decades, the distinctive advantages of non‐fullerene acceptors, such as tunable energy levels, broad absorption, and improved device stability, have rendered them as the mainstream acceptors in OSCs, recently. However, in most cases, processing additives are required for morphology optimization of the photoactive layer, and these additives usually possess high boiling point, which makes it difficult to remove them completely. The residual additives would accelerate performance deterioration, leading to poor device stability. Furthermore, the tedious optimization of additives complicates device fabrication and decreases performance reproducibility. In this review, we summarize the recent works based on non‐fullerene OSCs without using additives, affording insights into materials design and device fabrication for enabling highly efficient additive‐free non‐fullerene OSCs, which should be critical for the practical applications of OSCs.

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A New Electron Acceptor with meta‐Alkoxyphenyl Side Chain for Fullerene‐Free Polymer Solar Cells with 9.3% Efficiency

Cited by 41 publications

References 52 publications

Intensification of Vertical Phase Separation for Efficient Polymer Solar Cell via Piecewise Spray Assisted by a Solvent Driving Force

Intensification of Vertical Phase Separation for Efficient Polymer Solar Cell via Piecewise Spray Assisted by a Solvent Driving Force

High-performance asymmetric small molecular donor materials based on indenothiophene for solution-processed organic solar cells

Additive‐Free Non‐Fullerene Organic Solar Cells

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