A “σ-Hole”-Containing Volatile Solid Additive Enabling 16.5% Efficiency Organic Solar Cells

Fu, Jiehao; Chen, Shanshan; Yang, Ke; Jung, Seungmin; Lv, Jie; Lan, Linkai; Chen, Haiyan; Hu, Dingqin; Yang, Qianguang; Duan, Tainan; Kan, Zhipeng; Yang, Changduk; Sun, Kuan; Lu, Shirong; Xiao, Zeyun; Li, Yongfang

doi:10.1016/j.isci.2020.100965

Cited by 72 publications

(58 citation statements)

References 51 publications

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“…Hence, Y6 and its derivatives are extensively reported and used in recent research work. [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] For instance, other D-A copolymer donors, such as PTQ10, P2F-EHP, D16, W1, and D18, have been paired with Y6 to achieve excellent PCEs of 15% to 18%. [59][60][61][62][63] Besides, several research groups employed fullerene derivatives and Y6 to construct dual-acceptors ternary OPVs.…”

Section: Introductionmentioning

confidence: 99%

“…OSCs based on PM6: Y6 exhibited high electroluminescence quantum efficiency and low nonradiative recombination loss. Hence, Y6 and its derivatives are extensively reported and used in recent research work 43‐58 . For instance, other D‐A copolymer donors, such as PTQ10, P2F‐EHP, D16, W1, and D18, have been paired with Y6 to achieve excellent PCEs of 15% to 18% 59‐63 .…”

Section: Introductionmentioning

confidence: 99%

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Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Yan

Cai

et al. 2020

EcoMat

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The ternary strategy is effectual to attain high-performance organic photovoltaics (OPVs). Herein, device processing and performance of PM6:Y6:IT-4F OPVs is improved, and ITIC-Th with high-lying lowest unoccupied molecular orbital is incorporated into PM6: Y6 blend. The PM6:Y6: ITIC-Th device afforded an excellent PCE of 17.2%, surpassing PM6: Y6 device, and becoming one of the highest PCE. The resulting ITIC-Th-based ternary OSCs demonstrated low energy loss (E loss) of 0.53 to 0.54 eV, as compared to their binary counterparts with either high open-circuit voltage (V OC) but large E loss , or less E loss but low V OC. The incorporation of ITIC-Th and IT-4F balanced the charge mobilities, and thereby retained and improved fill factors. Increased crystalline coherence length and smaller d-spacing of π-π peaks are also observed in ternary blends, indicating enhanced crystallinity and thus improved active-layer morphology. These findings demonstrate the feasibility of exploring the exciting pool of nonfullerene acceptors to pursue new breakthroughs of OPVs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Yan

Cai

et al. 2020

EcoMat

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“…[ 72, 73 ] By using 1,4‐diiodotetrafluorobenzene as a volatile solid additive for the PM6:Y6 blend, the synergetic halogen interactions between 1,4‐diiodotetrafluorobenzene and BHJ blend film matrix contribute to more condensed and ordered molecular arrangement in the favorable interpenetrating donor/acceptor domains, enabling the significantly enhanced efficiency for the device. [ 74 ]…”

Section: Solid Additivesmentioning

confidence: 99%

“…[72,73] By using 1,4-diiodotetrafluorobenzene as a volatile solid additive for the PM6:Y6 blend, the synergetic halogen interactions between 1,4-diiodotetrafluorobenzene and BHJ blend film matrix contribute to more condensed and ordered molecular arrangement in the favorable interpenetrating donor/acceptor domains, enabling the significantly enhanced efficiency for the device. [74] This solid additive strategy opens a feasible and promising way to regulate the morphology correlated with better photovoltaic performance and device stability. The substituents on the solid additives affect the physicochemical properties and thus the outcome of blend film morphology, leaving the challenge of designing solid additives.…”

Section: Solid Additivesmentioning

confidence: 99%

Morphology optimization of photoactive layers in organic solar cells

Cui

2021

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Organic solar cells (OSCs) have unique advantages of light weight, low‐cost solution processing, and capability to be fabricated into flexible and semitransparent devices, which are widely recognized as a promising photovoltaic technology. Photoactive layers of the OSCs are composed of a blend of a p‐type organic semiconductor as a donor (D) and an n‐type organic semiconductor as acceptor (A). The morphology of the active layer with D/A nano‐scaled aggregation and face‐on π‐conjugated packing, and D/A interpenetrating network is crucial for achieving high photovoltaic performance of the OSCs. Therefore, great efforts have been devoted to control and optimize morphology of the active layers. This perspective focuses on the morphological control by solvent/solid processing additives and the morphology optimization by postdeposition treatment with thermal annealing and/or solvent vapor annealing, which have been extensively adopted and exhibit promising positive effect in optimizing the morphology. Representative examples are given and discussed to understand the foundation of the postdeposition treatments on tuning the morphology. Insights into the role of the postdeposition treatments and additive treatments on the morphology optimization will be beneficial to further improvement in morphology optimization for practical organic photovoltaic application.

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“…[5][6][7][8] Recently, non-fullerene acceptors (NFAs) based on Y6 have attracted extensive attentions and experienced a rapid progress in PCE. [9][10][11][12] Employing the Y6 based NFA, singlejunction binary ASM OSCs with above 14% PCE and ternary ASM OSCs with above 15.8% PCE have been reported. [13][14][15][16] However, the performance of ASM OSCs still lags behind the polymer donor based OSCs which show PCEs exceeding 18% in single junction binary devices.…”

Section: Introductionmentioning

confidence: 99%

15.3% Efficiency All‐Small‐Molecule Organic Solar Cells Achieved by a Locally Asymmetric F, Cl Disubstitution Strategy

Yang

Zheng

et al. 2021

Advanced Science

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Single junction binary all-small-molecule (ASM) organic solar cells (OSCs) with power conversion efficiency (PCE) beyond 14% are achieved by using non-fullerene acceptor Y6 as the electron acceptor, but still lag behind that of polymer OSCs. Herein, an asymmetric Y6-like acceptor, BTP-FCl-FCl, is designed and synthesized to match the recently reported high performance small molecule donor BTR-Cl, and a record efficiency of 15.3% for single-junction binary ASM OSCs is achieved. BTP-FCl-FCl features a F,Cl disubstitution on the same end group affording locally asymmetric structures, and so has a lower total dipole moment, larger average electronic static potential, and lower distribution disorder than those of the globally asymmetric isomer BTP-2F-2Cl, resulting in improved charge generation and extraction. In addition, BTP-FCl-FCl based active layer presents more favorable domain size and finer phase separation contributing to the faster charge extraction, longer charge carrier lifetime, and much lower recombination rate. Therefore, compared with BTP-2F-2Cl, BTP-FCl-FCl based devices provide better performance with FF enhanced from 71.41% to 75.36% and J sc increased from 22.35 to 24.58 mA cm −2 , leading to a higher PCE of 15.3%. The locally asymmetric F, Cl disubstitution on the same end group is a new strategy to achieve high performance ASM OSCs.

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A “σ-Hole”-Containing Volatile Solid Additive Enabling 16.5% Efficiency Organic Solar Cells

Abstract: A "s-hole''-containing small molecule is used as an additive for organic solar cells 16.5% efficiency organic solar cells are achieved with additive engineering Excellent stability and easy processability are obtained with the additive

Cited by 72 publications

References 51 publications

Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Morphology optimization of photoactive layers in organic solar cells

15.3% Efficiency All‐Small‐Molecule Organic Solar Cells Achieved by a Locally Asymmetric F, Cl Disubstitution Strategy

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A “σ-Hole”-Containing Volatile Solid Additive Enabling 16.5% Efficiency Organic Solar Cells

Abstract: A "s-hole''-containing small molecule is used as an additive for organic solar cells 16.5% efficiency organic solar cells are achieved with additive engineering Excellent stability and easy processability are obtained with the additive

Cited by 72 publications

References 51 publications

Reducing VOC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Reducing VOC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Morphology optimization of photoactive layers in organic solar cells

15.3% Efficiency All‐Small‐Molecule Organic Solar Cells Achieved by a Locally Asymmetric F, Cl Disubstitution Strategy

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Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics

Reducing V_OC loss via structure compatible and high lowest unoccupied molecular orbital nonfullerene acceptors for over 17%‐efficiency ternary organic photovoltaics