Asymmetrical Ladder‐Type Donor‐Induced Polar Small Molecule Acceptor to Promote Fill Factors Approaching 77% for High‐Performance Nonfullerene Polymer Solar Cells

Gao, Wei; Zhang, Miao; Liu, Tao; Ming, Ruijie; An, Qiaoshi; Wu, Kailong; Xie, Dongjun; Luo, Zhenghui; Zhong, Cheng; Liu, Feng; Zhang, Fujun; Yan, He; Yang, Chuluo

doi:10.1002/adma.201800052

Cited by 265 publications

(178 citation statements)

References 49 publications

Supporting

Mentioning

175

Contrasting

Order By: Relevance

“…The influence of fluorinated IC end‐capping groups on the photovoltaic performance of NFAs has been primarily focused on symmetric core unit systems . Asymmetry‐core‐based NFAs have been rarely studied, partly because it is more challenging to synthesize and purify an asymmetric core unit than its symmetric core unit counterpart. In this study, we designed and synthesized three asymmetric NFAs (TTPTTT‐IC, TTPTTT‐2F, and TTPTTT‐4F) using an asymmetric TTPTTT building block as the central core unit.…”

Section: Methodsmentioning

confidence: 99%

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

Song

et al. 2018

Solar RRL

View full text Add to dashboard Cite

Indacenodithiophene (IDT) has been widely used as the central core to design high‐performance acceptor‐donor‐acceptor (A‐D‐A)‐type non‐fullerene acceptors (NFAs). NFAs based on five‐, six‐, seven‐, and nine‐membered IDT have been successfully prepared. However, less research attention has been paid to the eight‐membered IDT derivative. In this study, a novel asymmetric TTPTTT building block as an eight‐membered IDT unit are designed and synthesized. The effect of nonfluorinated, monofluorinated, and difluorinated end‐capping groups on the photovoltaic performance of TTPTTT‐based NFAs are specifically investigated. By blending with the polymer donor PBT1‐C, organic solar cells (OSCs) based on TTPTTT‐IC, TTPTTT‐2F, and TTPTTT‐4F exhibited power conversion efficiencies (PCEs) of 7.91, 11.52, and 12.05%, respectively. Our results indicate that the asymmetric TTPTTT building block as an eight‐membered IDT derivative is a promising central core unit for designing high‐performance A‐D‐A type NFAs.

show abstract

Section: Methodsmentioning

confidence: 99%

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

Song

et al. 2018

Solar RRL

View full text Add to dashboard Cite

show abstract

“…Compound Py ‐ 1 was calculated to be an almost nonpolar molecule, and the dipole moment is only 0.005 D, whereas Py ‐ 2 is a polar molecule with a dipole moment of 1.84 D. These findings are consistent with the results of thin‐layer chromatography (TLC) analysis. As shown in Figure c, Py ‐ 1 shows a larger R f value than that of Py ‐ 2 , thus indicating the smaller polarity of Py ‐ 1 under the same molecular composition and interactions . This conclusion can be further confirmed by the measurement of the water contact angle.…”

Section: Resultsmentioning

confidence: 99%

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

Chen

et al. 2019

Chemistry A European J

View full text Add to dashboard Cite

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.

show abstract

“…The short‐circuit current density ( J SC ) of tandem OPVs is mainly determined by the smaller one of the two subcells, and the thickness of two active layers should be finely adjusted to balance the J SC of top and bottom subcells . Meanwhile, the conductivity and transmittance of the intermediate electrode should be simultaneously optimized by altering the thickness of the intermediate electrode to prepare highly efficient tandem OPVs . Ternary strategy can provide a simple method to recombine advantages of three materials into one OPV, which has been commonly demonstrated from different systems with two donors or two acceptors .…”

Section: The Photovoltaic Parameters Of Opvsmentioning

confidence: 99%

Inverted Ternary Organic Photovoltaics with Alloyed Acceptor Exhibiting 12.29% Efficiency

Bao

Wang

Zhang

et al. 2019

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

A series of inverted organic photovoltaics (OPVs) are fabricated with PBDB‐T as donor and nonfullerene materials (ITCC and IT‐M) as acceptors, respectively. Power conversion efficiencies (PCEs) of IT‐M‐ and ITCC‐based OPVs are 11.20% and 8.70%, respectively. A 12.29% PCE is achieved from the optimized ternary OPVs with active layers containing 20 wt% ITCC in acceptors, resulting from the simultaneous improvement of the fill factor (FF) of 74.31%, short‐circuit current density (JSC) of 17.41 mA cm−2, as well as open‐circuit voltage (VOC) of 0.952 V. Over 9% PCE improvement is obtained by using the ternary strategy, which is attributed to the complementary absorption spectra, excellent compatibility, as well as well‐matched energy levels of used materials. This work indicates the ternary strategy as an efficient method to achieve efficient OPVs while keeping the simplicity of the fabrication process.

show abstract

Asymmetrical Ladder‐Type Donor‐Induced Polar Small Molecule Acceptor to Promote Fill Factors Approaching 77% for High‐Performance Nonfullerene Polymer Solar Cells

Cited by 265 publications

References 49 publications

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

High‐Performance Eight‐Membered Indacenodithiophene‐Based Asymmetric A‐D‐A Type Non‐Fullerene Acceptors

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

Inverted Ternary Organic Photovoltaics with Alloyed Acceptor Exhibiting 12.29% Efficiency

Contact Info

Product

Resources

About