Isomeric Effects of Solution Processed Ladder‐Type Non‐Fullerene Electron Acceptors

Li, Yongxi; Lian, Zhong; Lin, Jiu‐Dong; Wu, Fu‐Peng; Bin, Haijun; Zhang, Zhanjun; Xu, Lai; Jiang, Zuo‐Quan; Zhang, Zhiguo; Liu, Feng; Russell, Thomas P.; Li, Yongfang; Liao, Liang‐Sheng; Forrest, Stephen R.

doi:10.1002/solr.201700107

Cited by 46 publications

(32 citation statements)

References 48 publications

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“…By replacing p ‐alkylphenyl of ITIC with m ‐alkylphenyl, Li and co‐workers designed and synthesized ITIC isomer, m ‐ITIC, that delivered an enhanced PCE up to 11.77% with J61 donor because of the improved crystallinity and electron mobility . Forrest and co‐workers reported a nonfullerene acceptor BDT‐IC, an isomer of ITIC, that shows a decreased optical bandgap and increased crystallinity delivering a better average PCE than that of ITIC . Recently, we developed isomeric thieno[3,4‐ b ]thiophene‐based n‐type quinoidal semiconductors with different sulfur orientations exhibiting significantly different electron transport property, which contributes to a comprehensive understanding on molecular structure and device performance.…”

Section: Introductionmentioning

confidence: 99%

Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Fan

et al. 2018

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Nonfullerene polymer solar cells develop quickly. However, nonfullerene small-molecule solar cells (NF-SMSCs) still show relatively inferior performance, attributing to the lack of comprehensive understanding of the structure-performance relationship. To address this issue, two isomeric small-molecule acceptors, NBDTP-F out and NBDTP-F in , with varied oxygen position in the benzodi(thienopyran) (BDTP) core are designed and synthesized. When blended with molecular donor BDT3TR-SF, devices based on the two isomeric acceptors show disparate photovoltaic performance. Fabricated with an eco-friendly processing solvent (tetrahydrofuran), the BDT3TR-SF:NBDTP-F out blend delivers a high power conversion efficiency of 11.2%, ranked to the top values reported to date, while the BDT3TR-SF:NBDTP-F in blend almost shows no photovoltaic response (0.02%). With detailed investigations on inherent optoelectronic processes as well as morphological evolution, this performance disparity is correlated to the interfacial tension of the two combinations and concludes that proper interfacial tension is a key factor for effective phase separation, optimal blend morphology, and superior performance, which can be achieved by the "isomerization" design on molecular acceptors. This work reveals the importance of modulating the materials miscibility by interfacial-tension-oriented molecular design, which provides a general guideline toward efficient NF-SMSCs. Photovoltaic Devices www.advancedsciencenews.com

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Section: Introductionmentioning

confidence: 99%

Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Fan

et al. 2018

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“…High PCE of 9.33% was reported with inverted OSCs using PBDB‐T: BDCPDT‐IC blend. Forrest and co‐workers also reported the identical FREA (namely, BDT‐IC , Figure ) . Strong intermolecular interactions led to µ e up to 5 times higher when compared with ITIC .…”

Section: Nfas and Various Aspects Of Freasmentioning

confidence: 70%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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“…Compared with ITIC, BDI‐IC showed a higher electron mobility, which was beneficial for suppressing charge recombination. BDT‐IC also showed promising electronic structure and crystalline properties, which demonstrated the validity of isomerism strategy for high‐performance OSCs . Chen et al .…”

Section: Nfsmas For Additive‐free Oscsmentioning

confidence: 92%

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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Isomeric Effects of Solution Processed Ladder‐Type Non‐Fullerene Electron Acceptors

Cited by 46 publications

References 48 publications

Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Isomery‐Dependent Miscibility Enables High‐Performance All‐Small‐Molecule Solar Cells

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Additive‐Free Non‐Fullerene Organic Solar Cells

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