Bis-Silicon-Bridged Stilbene: A Core for Small-Molecule Electron Acceptor for High-Performance Organic Solar Cells

Zhang, Zhongbo; Zhu, Xiaozhang

doi:10.1021/acs.chemmater.7b04930

Cited by 36 publications

(19 citation statements)

References 47 publications

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“…More importantly, the Py ‐ 1 ‐based devices show much higher photovoltaic performance than that of Py ‐ 2 in all cases. Interestingly, unlike many other NFAs OSCs, the device performance is insensitive to the D/A ratio, which is necessary for practical applications …”

Section: Resultsmentioning

confidence: 99%

“…Interestingly,u nlike many other NFAs OSCs, the devicep erformance is insensitive to the D/A ratio, which is necessary for practical applications. [22] To gain insight into the reason for the higher photovoltaic performance of the Py-1-based device than that of Py-2,c omparisons tudies were carried on the corresponding devices with D/A ratios of 1:1. As depicted in Figure 4a and Table 2, the open circuit voltage (V OC )o ft heir devices are quite analogous, which should be attributed to the similarL UMO energy levels of Py-1 and Py-2;b ut as far as short circuit currents (J SC ) and fill factor (FF)a re concerned, the Py-1-based devices show much higher J SC (12.96 mA cm À2 )a nd FF (0.60) than that of Py-2 (9.67 mA cm À2 and 0.47).…”

Section: Photovoltaic Characteristicsmentioning

confidence: 99%

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Isomers of Dithienocyclopentapyrene‐Based Non‐Fullerene Electron Acceptors: Configuration Effect on Photoelectronic Properties

Chen

et al. 2019

Chemistry A European J

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One pair of isomers, centrosymmetric anti‐Py‐1 and axisymmetric syn‐Py‐2, was designed and synthesized with an acceptor–donor–acceptor (A–D–A) structure by choosing dithienocyclopentapyrene with four 4‐hexylphenyl side chains as the D unit, and 2‐(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene) malononitrile as the A unit. In‐depth structure–property relationship studies revealed that the isomers have similar UV/Vis absorption, fluorescence emission, and energy levels but significant differences in molecular shape, polarity, and charge mobility. Solution‐processed bulk‐heterojunction (BHJ) small‐molecule organic solar cells with Py‐1 as the electron‐acceptor material and PTB7‐Th as the electron‐donor material exhibit a power conversion efficiency (PCE) of 6.07 %, or 60 % higher than that of Py‐2 (3.7 %), which could be mainly attributed to the higher and more balanced hole/electron mobilities and better phase separation of the Py‐1‐based active layer.

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Section: Resultsmentioning

confidence: 99%

Section: Photovoltaic Characteristicsmentioning

confidence: 99%

Isomers of Dithienocyclopentapyrene‐Based Non‐Fullerene Electron Acceptors: Configuration Effect on Photoelectronic Properties

Chen

et al. 2019

Chemistry A European J

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“…Bis-silicon-bridged stilbene (BSS) has rigid and coplanar structure and four side chains can suppress the strong aggregations. When blended with PBDB-T, the OSCs obtained a PCE of 10.33% with CN as additive (Zhang and Zhu, 2018 ). IHIC was a fused hexacyclic small molecule acceptor and the central core consisted of thieno[3,2- b ]thiophene ring and two terminal thiophene.…”

Section: Acceptor-donor-acceptor (A-d-a) Fused-ring Electron Acceptormentioning

confidence: 99%

Small-Molecule Electron Acceptors for Efficient Non-fullerene Organic Solar Cells

et al. 2018

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The development of organic electron acceptor materials is one of the key factors for realizing high performance organic solar cells. Compared to traditional fullerene acceptor materials, non-fullerene electron acceptors have attracted much attention due to their better optoelectronic tunabilities and lower cost as well as higher stability. Non-fullerene organic solar cells have recently experienced a rapid increase with power conversion efficiency of single-junction devices over 14% and a bit higher than 15% for tandem solar cells. In this review, two types of promising small-molecule electron acceptors are discussed: perylene diimide based acceptors and acceptor(A)-donor(D)-acceptor(A) fused-ring electron acceptors, focusing on the effects of structural modification on absorption, energy levels, aggregation and performances. We strongly believe that further development of non-fullerene electron acceptors will hold bright future for organic solar cells.

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“…[ 31 ] Owing to their variant steric and orbital nature, bridging atoms could play a pivotal role in tailoring the optical and electronic properties of NFAs. [ 47–51 ] For instance, Jen et al replaced carbon with nitrogen as the bridging atom of NFAs, enabling a decent PCE of 13.2%. [ 47 ] Similarly, Bazan et al replaced carbon with silicon as the bridging atom of NFAs, which yielded an improvement in the PCE from 7.4% to 9.0%.…”

Section: Introductionmentioning

confidence: 99%

Chlorinated Carbon‐Bridged and Silicon‐Bridged Carbazole‐Based Nonfullerene Acceptors Manifest Synergistic Enhancement in Ternary Organic Solar Cell with Efficiency over 15%

Chen

Lin

et al. 2020

Solar RRL

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Bulk-heterojunction organic solar cells (BHJ-OSCs) have attracted tremendous interest in the scientific community, [1-4] owing to their versatile merits, including transparency, [5] flexibility, [6] solution processability, and light weight. In recent years, extensive efforts have been made to improve the photovoltaic performance, [7-11] which has increased the power conversion efficiency (PCE) by over 18% in binary BHJ-OSCs. [12,13] However, the state-of-art photovoltaic performance of BHJ-OSCs still lags behind other competing photovoltaic technologies, such as silicon-based solar cells [14] and perovskite solar cells. [15] To further elevate the PCE of BHJ-OSCs, integrating two binary OSCs into one ternary OSC has been deemed as one of the most effective approaches. [16-27] By tuning the content of the active layer, ternary BHJ-OSCs, comprising either two donors or two acceptors, can produce a remarkable open-circuit voltage (V OC), short-circuit current density (J SC), and fill factor (FF). Moreover, the unique features observed in intrinsic binary OSCs are likely to be inherited in ternary OSCs. Interestingly, the strategy of ternary OSCs

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Bis-Silicon-Bridged Stilbene: A Core for Small-Molecule Electron Acceptor for High-Performance Organic Solar Cells

Abstract: ter.7b04930. General experimental methods, thermal gravimetric analysis, cyclic voltammetry measurement, charge transport property, OPV device data, the AFM, TEM, and NMR spectra of all new compounds (PDF)

Cited by 36 publications

References 47 publications

Isomers of Dithienocyclopentapyrene‐Based Non‐Fullerene Electron Acceptors: Configuration Effect on Photoelectronic Properties

Isomers of Dithienocyclopentapyrene‐Based Non‐Fullerene Electron Acceptors: Configuration Effect on Photoelectronic Properties

Small-Molecule Electron Acceptors for Efficient Non-fullerene Organic Solar Cells

Chlorinated Carbon‐Bridged and Silicon‐Bridged Carbazole‐Based Nonfullerene Acceptors Manifest Synergistic Enhancement in Ternary Organic Solar Cell with Efficiency over 15%

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