Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Wang, Yilin; Zhu, Qinglian; Naveed, Hafiz Bilal; Zhao, Heng; Zhou, Ke; Ma, Wei

doi:10.1002/aenm.201903609

Cited by 74 publications

(65 citation statements)

References 55 publications

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“…Recent studies demonstrated that replacing alkyls with oligo(ethylene glycol) side chains is able to generate water or alcohol soluble conjugated polymers and acceptors. [184][185][186][187] In addition, scalable coating methods such as blade coating, [188][189][190][191][192] and slot-die coating [193][194][195][196][197] and roll-to-roll printing [198,199] should be more extensively explored. 6) Development of PT-based all-polymer solar cells: All-polymer solar cells exhibit unique advantages, such as excellent mechanical property, good morphological stability, and readily tunable solution viscosity.…”

Section: Discussionmentioning

confidence: 99%

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Wang

Qin

et al. 2020

Advanced Energy Materials

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Section: Discussionmentioning

confidence: 99%

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Wang

Qin

et al. 2020

Advanced Energy Materials

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“…23. Compared with the PET plastic bonded with PEDOT:PSS, the PET plastic bonded with PEDOT:EVA exhibits significantly superior bonding performance, which can maintain mechanical stability until fracture occurs at a strain ratio of 17-18% (for the PEDOT:PSS, the fracture-tensile ratio is no >10%), confirming that the PEDOT:EVA ink has an optimistic cohesiveness 64,65 . The cohesiveness of EVA originates from the adsorption interaction of EVA emulsion (Van Der Waals or hydrogen-bonding interaction) in the PEDOT:EVA ink prepared by the miniemulsion method, which has been reported in previous adhesive work 66,67 .…”

Section: Mechanical and Environmental Stabilities For Flexible Pscsmentioning

confidence: 97%

Bio-inspired vertebral design for scalable and flexible perovskite solar cells

et al. 2020

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The translation of unparalleled efficiency from the lab-scale devices to practical-scale flexible modules affords a huge performance loss for flexible perovskite solar cells (PSCs). The degradation is attributed to the brittleness and discrepancy of perovskite crystal growth upon different substrates. Inspired by robust crystallization and flexible structure of vertebrae, herein, we employ a conductive and glued polymer between indium tin oxide and perovskite layers, which simultaneously facilitates oriented crystallization of perovskite and sticks the devices. With the results of experimental characterizations and theoretical simulations, this bionic interface layer accurately controls the crystallization and acts as an adhesive. The flexible PSCs achieve the power conversion efficiencies of 19.87% and 17.55% at effective areas of 1.01 cm 2 and 31.20 cm 2 respectively, retaining over 85% of original efficiency after 7000 narrow bending cycles with negligible angular dependence. Finally, the modules are assembled into a wearable solar-power source, enabling the upscaling of flexible electronics.

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“…[37][38][39][40] Despite these attractive characteristics, sequentially deposited (SD) OSCs have received less attention and their efficiencies lag behind those of the conventional BHJ (C-BHJ) OSCs prepared with a single casting process. [41][42][43][44][45][46][47] Therefore, it is imperative to demonstrate the general applicability of sequential deposition as an effective yet simpler method for achieving desired BHJ morphology and device performance.…”

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confidence: 99%

A Generally Applicable Approach Using Sequential Deposition to Enable Highly Efficient Organic Solar Cells

Gao

et al. 2020

Small Methods

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Organic solar cells (OSCs) have attracted enormous research interest due to their promise for the realization of lightweight, mechanically flexible, and portable power generators using low-cost printing techniques. [1-3] Solution-processable OSCs are typically based on a bulk heterojunction (BHJ) architecture comprising electron-donating (donor) and electronaccepting (acceptor) semiconductors. In recent years, the continual development of innovative photovoltaic materials, [4-14] device and interface engineering [15-19] in conjunction with better understanding of fundamental mechanisms [20-23] have contributed to the rapid progress of BHJ OSCs. Their power conversion efficiencies (PCEs) have now reached more than 17% for both single-junction [24-28] and tandem [29] devices, providing great prospects for practical applications. The achievable performance of OSCs is strongly dependent on the BHJ blend morphology, wherein the donor and acceptor are expected to form nanoscale phase separation and bicontinuous pathways for maximizing charge generation and transport. [30] At present, BHJ photoactive layers are fabricated normally via spin-coating of the mixture of donor and acceptor materials, which usually leads to complicated dynamics and kinetics during the morphological evolution. [31,32] One of the long-standing challenges in realizing optimum BHJ configuration through such a method is to strike a delicate balance between the miscibility and self-organization of two active components during processing, thus imposing stringent requirements on the treatment conditions. Specifically, in the state-of-the-art nonfullerene systems, the donor and acceptor typically possess similar planar molecular structures and good miscibility, which enhances the difficulty in controlling the BHJ morphology. [33] An alternative way is to deposit neat donor and acceptor sequentially trying to reduce the complexity of interaction between two components. Previous studies have indicated that this sequential deposition method is feasible to create a p-in like structure due to the interdiffusion of top layer into bottom one and higher gradient concentration of acceptors near the cathode and donors near the anode. [34-36] Additionally, the two-step procedure allows each layer to be regulated and optimized independently, affording new opportunities for Bulk-heterojunction (BHJ) organic solar cells (OSCs) are prepared by a common one-step solution casting of donor-acceptor blends often encounter dynamic morphological evolution which is hard to control to achieve optimal performance. To overcome this hurdle, a generally applicable, sequential processing approach has been developed to construct high-performance OSCs without involving tedious processes. The morphology of photoactive layers comprising a polymer donor (PM6) and a nonfullerene acceptor (denoted as Y6-BO) can be precisely manipulated by tuning Y6-BO layer with a small amount of 1-chloronaphthalene additive to induce the structural order of Y6-BO molecules to impact the blend phase. Th...

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Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Cited by 74 publications

References 55 publications

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Bio-inspired vertebral design for scalable and flexible perovskite solar cells

A Generally Applicable Approach Using Sequential Deposition to Enable Highly Efficient Organic Solar Cells

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