Ternary non-fullerene polymer solar cells with 13.51% efficiency and a record-high fill factor of 78.13%

Li, Nian; Kan, Yuanyuan; Wang, Haitao; Gao, Ke; Bai, Xu; Qiu, Rong; Wang, Rong; Wang, Jing; Liu, Feng; Chen, Junwu; Zhou, Guofu; Russell, Thomas P.; Jen, Alex K.‐Y.

doi:10.1039/c8ee01564c

Cited by 146 publications

(92 citation statements)

References 34 publications

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“…By determining the slope of the V oc – P light curve, the related mechanism of recombination can be investigated. If the slope value approaches 1 K B T / q ( T , absolute temperature; K B , Boltzmann's constant; and q , the elementary charge), the mechanism will be led by bimolecular recombination in the active layers . Alternatively, if the slope value approaches 2 K B T / q , the mechanism will be dominated by trap‐assisted recombination.…”

Section: Detailed Photovoltaic Parameters Of Devices Employing Pm6:y6mentioning

confidence: 99%

Graphdiyne Derivative as Multifunctional Solid Additive in Binary Organic Solar Cells with 17.3% Efficiency and High Reproductivity

et al. 2020

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Morphology tuning of the blend film in organic solar cells (OSCs) is a key approach to improve device efficiencies. Among various strategies, solid additive is proposed as a simple and new way to enable morphology tuning. However, there exist few solid additives reported to meet such expectations. Herein, chlorine‐functionalized graphdiyne (GCl) is successfully applied as a multifunctional solid additive to fine‐tune the morphology and improve device efficiency as well as reproductivity for the first time. Compared with 15.6% efficiency for control devices, a record high efficiency of 17.3% with the certified one of 17.1% is obtained along with the simultaneous increase of short‐circuit current (Jsc) and fill factor (FF), displaying the state‐of‐the‐art binary organic solar cells at present. The redshift of the film absorption, enhanced crystallinity, prominent phase separation, improved mobility, and decreased charge recombination synergistically account for the increase of Jsc and FF after introducing GCl into the blend film. Moreover, the addition of GCl dramatically reduces batch‐to‐batch variations benefiting mass production owing to the nonvolatile property of GCl. All these results confirm the efficacy of GCl to enhance device performance, demonstrating a promising application of GCl as a multifunctional solid additive in the field of OSCs.

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Section: Detailed Photovoltaic Parameters Of Devices Employing Pm6:y6mentioning

confidence: 99%

Graphdiyne Derivative as Multifunctional Solid Additive in Binary Organic Solar Cells with 17.3% Efficiency and High Reproductivity

et al. 2020

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“…As such, the guest acceptor can be designed with its LUMO level lower than or parallel to the LUMO energy of the host one, thereby a smaller reduction in V oc can be realized in several judiciously designed material systems . Based on the judicious design on the ternary material systems, over 13% PCEs have been achieved in this kind of ternary systems …”

Section: Introductionmentioning

confidence: 99%

Ternary Blended Fullerene‐Free Polymer Solar Cells with 16.5% Efficiency Enabled with a Higher‐LUMO‐Level Acceptor to Improve Film Morphology

Tang

et al. 2019

Advanced Energy Materials

223

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achieved power conversion efficiencies (PCEs) greater than 15% in singlejunction binary devices. [13,14] However, the performance of the binary system is still largely limited by the material's own properties (narrow absorption, small crystallinity, low charge mobility, strong recombination, etc.). In order to overcome these limitations, the strategy of adding a third component to the binary system, e.g., ternary solar cell approach, has come into being and shown wideranging applicability in improving the solar cell device function. The addition of a structurally similar third component can either extend the absorption range of solar emission spectrum, tune the frontier molecular orbital (FMOs) levels such as through forming homogeneous donor or acceptor phases, [15,16] modulate the active layer's electric property by improving the film morphology, [17][18][19] or tune the acceptor phase optical property, [20] which can promote either the device short-circuit current density (J sc ), or open-circuit voltage (V oc ), or fill factor (FF), and finally, boost power conversion efficiencies with the values reaching over 13% recently. [21][22][23][24][25][26] The ternary approach, by introducing a smaller bandgap nonfullerene acceptor as a near infrared (NIR) absorber to increase the device J sc of fullerene-free binary blended material systems, hereafter named as the "current-increased" Ternary approaches to solar cell design utilizing a small bandgap nonfullerene acceptor as the near infrared absorber to increase the short-circuit current density always decreases the open-circuit voltage. Herein, a highly efficient polymer solar cell with an impressive efficiency of 16.28 ± 0.20% enabled by an effective voltage-increased ternary blended fullerene-free material approach is reported. In this approach, the structural similarity between the host and the higher-LUMO-level guest enables the two acceptors to be synergized, obtaining increased open-circuit voltage and fill factor and a small increase of short-circuit current density. The same beneficial effects are demonstrated by using two host binary systems. The homogeneous fine film morphologies and the π-π stacking patterns of the host blend are well maintained, while larger donor and acceptor phases and increased lamellar crystallinity, increased charge mobilities, and reduced monomolecular recombination can be achieved upon addition of the guest nonfullerene acceptor. The increased charge mobilities and reduced monomolecular recombination not only contribute to the improved fill factor but also enable the best devices to be fabricated with a relatively thicker ternary blended active layer (110 vs 100 nm). This, combined with the absorption from the added guest acceptor, contribute to the increased short-circuit current.

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“…In addition to the innovation of active materials development, device optimization processes including solvent additives, interfacial engineering, and ternary strategies, also play critical roles in improving the performance of solar cells. Among these, constructing ternary solar cells, which have two donor materials paired with one acceptor (2D/1A) or one donor paired with two acceptors (1D/2A), is a simple and effective way to improve the overall device performance .…”

Section: Introductionmentioning

confidence: 99%

As‐Cast Ternary Organic Solar Cells Based on an Asymmetric Side‐Chains Featured Acceptor with Reduced Voltage Loss and 14.0% Efficiency

Chen

Kan

et al. 2020

Adv Funct Materials

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A new small‐molecule nonfullerene acceptor based on the benzo[1,2‐b:4,5‐b′]dithiophene (BDT) fused central core with asymmetrical alkoxy and thienyl side chains, namely TOBDT, is designed and synthesized. The alkoxy unit helps narrow the bandgap, and thienyl side chain helps enhance the intermolecular interaction. As a result, TOBDT is suitable to match the deep‐lying highest occupied molecular orbital (HOMO) of polymer donor PM6. Then, a strong crystalline acceptor IDIC is introduced as the third component to fabricate as‐cast nonfullerene ternary devices to achieve absorption and morphology control. Addition of IDIC not only mixes well with TOBDT but modulates the morphology of the blend film, which helps to balance the charge transport properties and reduce the photovoltage loss of ternary devices. All these contribute to synergetic improvement of Jsc, Voc, and fill factor parameters, leading to a power conversion efficiency of 14.0% for the as‐cast fullerene‐free ternary device.

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Ternary non-fullerene polymer solar cells with 13.51% efficiency and a record-high fill factor of 78.13%

Abstract: High PCEs and FFs are achieved in ternary non-fullerene PSCs by adding a strongly aggregating polymer into PBDB-T:IT-M and PBDB-T:ITIC.

Cited by 146 publications

References 34 publications

Graphdiyne Derivative as Multifunctional Solid Additive in Binary Organic Solar Cells with 17.3% Efficiency and High Reproductivity

Graphdiyne Derivative as Multifunctional Solid Additive in Binary Organic Solar Cells with 17.3% Efficiency and High Reproductivity

Ternary Blended Fullerene‐Free Polymer Solar Cells with 16.5% Efficiency Enabled with a Higher‐LUMO‐Level Acceptor to Improve Film Morphology

As‐Cast Ternary Organic Solar Cells Based on an Asymmetric Side‐Chains Featured Acceptor with Reduced Voltage Loss and 14.0% Efficiency

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