13.9% Efficiency Ternary Nonfullerene Organic Solar Cells Featuring Low-Structural Order

Du, Baocai; Geng, Renyong; Li, Wei; Li, Donghui; Mao, Yuchao; Chen, Mengxue; Zhang, Xue; Smith, Joel A.; Kilbride, Rachel C.; O’Kane, Mary E.; Liu, Dan; Lidzey, David G.; Tang, Weihua; Wang, Tao

doi:10.1021/acsenergylett.9b01630

Cited by 52 publications

(34 citation statements)

References 61 publications

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“…Various publications have suggested that by adding a small amount of either D or A to a binary BHJ, the third component gives rise to balanced transport and increased solar cell performance. [31][32][33][34] The addition of a small amount of a fullerene molecule in polymer/non-fullerene solar cells has also been widely adopted to increase device performance and stability. As a relevant example, adding the fullerene PCBM to the blend of PM6 with Y6 led to a substantial increase in both the hole and electron mobilities.…”

Section: Resultsmentioning

confidence: 99%

Putting Order into PM6:Y6 Solar Cells to Reduce the Langevin Recombination in 400 nm Thick Junction

et al. 2020

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Increasing the active layer thickness without sacrificing the power conversion efficiency (PCE) is one of the great challenges faced by organic solar cells (OSCs) for commercialization. Recently, PM6:Y6 as an OSC based on a non‐fullerene acceptor (NFA) has excited the community because of its PCE reaching as high as 15.9%; however, by increasing the thickness, the PCE drops due to the reduction of the fill factor (FF). This drop is attributed to change in mobility ratio with increasing thickness. Furthermore, this work demonstrates that by regulating the packing and the crystallinity of the donor and the acceptor, through volumetric content of chloronaphthalene (CN) as a solvent additive, one can improve the FF of a thick PM6:Y6 device (≈400 nm) from 58% to 68% (PCE enhances from 12.2% to 14.4%). The data indicate that the origin of this enhancement is the reduction of the structural and energetic disorders in the thick device with 1.5% CN compared with 0.5% CN. This correlates with improved electron and hole mobilities and a 50% suppressed bimolecular recombination, such that the non‐Langevin reduction factor is 180 times. This work reveals the role of disorder on the charge extraction and bimolecular recombination of NFA‐based OSCs.

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Section: Resultsmentioning

confidence: 99%

Putting Order into PM6:Y6 Solar Cells to Reduce the Langevin Recombination in 400 nm Thick Junction

et al. 2020

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“…In contrast, pristine DR8 film displays a quite different molecular assembly feature, i.e.,a strong (100) signal at 0.328 Å −1 was observed in the IP direction while a lamellar signal at 0.341 Å −1 in the OOP direction, suggesting mixed face‐on and edge‐on orientations in the film. [ 41 ] The binary PM6:ITC6‐4Cl blend film displays a preferential face‐on orientation, with a (100) lamellar stacking diffraction peak located at q xy = 0.307 Å −1 in the IP direction and a (010) π–π stacking peak at q z = 1.71 Å −1 in the OOP direction (Table S5, Supporting Information). Thus, the interlamellar spacing and π–π stacking distances are calculated to be 20.46 and 3.67 Å, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Simple Dithieno[3,2‐b:2′,3′‐d]pyrrol‐Rhodanine Molecular Third Component Enables Over 16.7% Efficiency and Stable Organic Solar Cells

Wang

Yang

Lin

et al. 2021

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Organic solar cells (OSCs) can achieve greatly improved power conversion efficiency (PCE) by incorporating suitable additives in active layers. Their structure design often faces the challenge of operation generality for more binary blends. Herein, a simple dithieno[3,2‐b:2′,3′‐d]pyrrole‐rhodanine molecule (DR8) featuring high compatibility with polymer donor PM6 is developed as a cost‐effective third component. By employing classic ITIC‐like ITC6‐4Cl and Y6 as model nonfullerene acceptors (NFAs) in PM6‐based binary blends, DR8 added PM6:ITC6‐4Cl blends exhibit significantly promoted energy transfer and exciton dissociation. The PM6:ITC6‐4Cl:DR8 (1:1:0.1, weight ratio) OSCs contribute an exciting PCE of 14.94% in comparison to host binary devices (13.52%), while PM6:Y6:DR8 (1:1.2:0.1) blends enable 16.73% PCE with all simultaneously improved photovoltaic parameters. To the best of the knowledge, this performance is among the best for ternary OSCs with simple small molecular third components in the literature. More importantly, DR8‐added ternary OSCs exhibit much improved device stability against thermal aging and light soaking over binary ones. This work provides new insight on the design of efficient third components for OSCs.

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“…[ 19 ] In detail, all blend exhibit a (100) lamellar packing diffraction peak at q xy = 0.28 Å −1 in IP directions with a lamellar distance of 22.44 Å, which is the characteristic of PBDB‐T. [ 52 ] Correspondingly, the crystal coherence length (CCL) of PBDB‐T:IPT2F‐TT blend is calculated to be 11.78 nm in IP direction, longer than IPT2F‐Ph‐ (11.31 nm) and IPT2F‐Th‐ (11.31 nm) based counterparts. Moreover, PBDB‐T:IPT2F‐TT blends exhibit the (010) ππ stacking diffraction peak in OOP direction at q z = 1.72 Å −1 , smaller than q z (1.75 Å) for PBDB‐T blends with IPT2F‐Ph, IPT2F‐Th, and IPT‐2F blends.…”

Section: Resultsmentioning

confidence: 99%

2D Side‐Chain Engineered Asymmetric Acceptors Enabling Over 14% Efficiency and 75% Fill Factor Stable Organic Solar Cells

Cao

Wang

et al. 2020

Adv Funct Materials

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The charge transport and morphology of active layers are key considerations for device performance and stability in organic solar cells (OSCs). Such properties can be fine-tuned via elaborate molecular design of fused-ring electron acceptors (FREAs), especially conjugation extension and side chain engineering. In this work, N-functionalized conjugation is explored in the design of high-efficient asymmetric FREAs. The twisting of N-conjugated side chains from backbone endows three FREAs with similar energy levels and light absorptions (≈850 nm edge). Their blends with PBDB-T exhibit high charge carrier mobility and ordered phase separation. Excitingly, IPT2F-TT based OSCs yield a champion power conversion efficiency (PCE) of 14.02% with a fill factor (FF) of 75.06%, outperforming PBDB-T devices with IPT2F-Th (12.52%, 71.20%), IPT2F-Ph (13.13%, 72.11%), and octylated IPT-2F (13.70%, 71.50%). The PCE over 14% and FF over 75% are among the highest values for 2D FREAs OSCs reported to date. More importantly, outstanding thermal stability and light soaking stability are observed with PCE over 12% maintained after thermal or light aging for 100 h. This work demonstrates N-conjugated FREAs design as an effective strategy to simultaneously improve the photovoltaic performance and device stability for the OSCs.

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13.9% Efficiency Ternary Nonfullerene Organic Solar Cells Featuring Low-Structural Order

Cited by 52 publications

References 61 publications

Putting Order into PM6:Y6 Solar Cells to Reduce the Langevin Recombination in 400 nm Thick Junction

Putting Order into PM6:Y6 Solar Cells to Reduce the Langevin Recombination in 400 nm Thick Junction

A Simple Dithieno[3,2‐b:2′,3′‐d]pyrrol‐Rhodanine Molecular Third Component Enables Over 16.7% Efficiency and Stable Organic Solar Cells

2D Side‐Chain Engineered Asymmetric Acceptors Enabling Over 14% Efficiency and 75% Fill Factor Stable Organic Solar Cells

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