Temperature‐Dependent Aggregation Donor Polymers Enable Highly Efficient Sequentially Processed Organic Photovoltaics Without the Need of Orthogonal Solvents

Arunagiri, Lingeswaran; Zhang, Guangye; Hu, Huawei; Yao, Huatong; Zhang, Kai; Li, Yunke; Chow, Philip C. Y.; Ade, Harald; Yan, He

doi:10.1002/adfm.201902478

Cited by 53 publications

(53 citation statements)

References 63 publications

(72 reference statements)

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“…23,25,26,30,155,[173][174][175][176][177][178][179][180][181][182][183][184][185][186] Recently, NFAs have been integrated into spin casted bilayer devices, enabling PCEs in excess of 10%. 28,29,44,49,59,123,125,126,129,130,133,[187][188][189][190] One example of a NFA system is PBTB-TFS1 ( Fig. 6, b43)/ITIC-4F (Fig.…”

Section: Lbl Opv Device Fabrication By Sequential Spin Coating Processesmentioning

confidence: 99%

“…LbL OPVs have been fabricated using the same solvent for both layers, achieving higher power conversion efficiencies (PCEs) and increased area modules through improved control over morphology and reduced dependence on processing conditions. [28][29][30] Cells produced through LbL outperformed their BHJ equivalents on both small and very large areas up to 11.52 cm 2 , resulting in the record efficiency reported for a large-area OPV module of 12%. 31 This review highlights the growth and potential of this fabrication process through exploring studies that focus on LbL processing of OPVs.…”

Section: Introductionmentioning

confidence: 99%

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Layer-by-layer fabrication of organic photovoltaic devices: material selection and processing conditions

Faure

Lessard

2021

J. Mater. Chem. C

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Section: Lbl Opv Device Fabrication By Sequential Spin Coating Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Layer-by-layer fabrication of organic photovoltaic devices: material selection and processing conditions

Faure

Lessard

2021

J. Mater. Chem. C

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Section: Temperature Induced Aggregation In Solid‐state Thin Filmsmentioning

confidence: 99%

Temperature Induced Aggregation of Organic Semiconductors

Yan

et al. 2020

Chemistry A European J

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One important feature of organic semiconductors is their solution processability, which allows researchers to tune their aggregation states in solution and solid states and to control the processing conditions to reach desirable electronic and optoelectronic properties. Temperature is one of the most important processing parameters of organic semiconductors and has been studied extensively particularly for those conjugated small‐ and macro‐ molecules with strong temperature‐dependent aggregation properties. This minireview summarizes the temperature‐induced aggregation behaviors of organic semiconductors in solution, during solution casting and upon thermal annealing post‐treatment of solid‐state thin films. The influences of different aggregation states on the optoelectronic properties, in particular the photovoltaic properties, are discussed. The conclusions in this work will provide a rational guide to precisely control the aggregation states of organic semiconductors to fabricate high‐performance optoelectronic devices.

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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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Temperature‐Dependent Aggregation Donor Polymers Enable Highly Efficient Sequentially Processed Organic Photovoltaics Without the Need of Orthogonal Solvents

Cited by 53 publications

References 63 publications

Layer-by-layer fabrication of organic photovoltaic devices: material selection and processing conditions

Layer-by-layer fabrication of organic photovoltaic devices: material selection and processing conditions

Temperature Induced Aggregation of Organic Semiconductors

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

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