Recent Advances of Film–Forming Kinetics in Organic Solar Cells

Liang, Qiuju; Yao, Jianhong; Hu, Zhangbo; Wei, Puxin; Lu, Haodong; Yin, Yukai; Wang, Kang; Liu, Jiangang

doi:10.3390/en14227604

Cited by 9 publications

(9 citation statements)

References 120 publications

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“…Suitable domain sizes are important for device performance and stability due to the limited exciton lifetime. ,− However, owing to the strong self-organization ability of non-fullerene in some blends, crystallization always induces excessive domain size during the film-forming process or continuous growth of domains during the operation process. − Hence, regulating the crystallization of non-fullerene, i.e., crystal nucleation and crystal growth, is an effective method to optimize the device performance and its stability.…”

Section: Working Mechanisms Of Solid Additivesmentioning

confidence: 99%

Recent Advances of Solid Additives Used in Organic Solar Cells: Toward Efficient and Stable Solar Cells

Liang

et al. 2022

ACS Appl. Energy Mater.

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Bulk heterojunction (BHJ) organic photovoltaics (OPVs) are considered to be the most promising generation of green energy technology due to their outstanding device performance and simple processing technology. The morphology of the active layer of OPVs is the key to its device performance and stability. So for, various strategies have been proposed to optimize the morphology, such as thermal annealing, solvent annealing, adding solvent additives and so on. However, the posting annealing is not compatible with large-area printing. In addition, solvent additives are easy to remain in active layer, which continuously deteriorate the morphology and performance of OPVs. Recently, the addition of solid additives has drawn significant attentions due to its unique characteristics, including improved device stability, precise morphology control as well as easy accessibility. Hence, it gradually becomes a universal and popular strategy for optimizing the morphology of OPVs with high power conversion efficiency (PCE). However, the relationship between properties of solid additives and morphologies of active layers is still ambiguous, which inhibit the further development of solid additive and its application in new emerging OPVs systems. To this end, we summarized the recently reported solid additives according to their volatility, i.e., whether solid additives remain in final active layer or not. Furthermore, the different mechanisms that solid additives optimize the morphology of active layer are intensively discussed, including the free volume and diffusivity, intermolecular adsorption energy, interaction among donor and acceptor, and crystal nucleation and growth, which may give predictions for selecting proper solid additives in new emerging blends. Finally, the challenges and future development of solid additives in OPVs are briefly prospected.

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Section: Working Mechanisms Of Solid Additivesmentioning

confidence: 99%

Recent Advances of Solid Additives Used in Organic Solar Cells: Toward Efficient and Stable Solar Cells

Liang

et al. 2022

ACS Appl. Energy Mater.

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“…When a phase-separated structure is formed in which the donor and acceptor materials are enriched in the vicinity of the anode and cathode, respectively, the compounding of electrons and holes in the transport process can be reduced, and carrier transport and collection can be minimized. However, such ideal morphology is difficult to obtain due to the intricate interaction between the donor and acceptor [54][55][56]. In the last decade, numerous techniques have been explored for improving the active layer's morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Aiming at solving the above problems, an effective strategy is developed via regulating the crystallization kinetics of blends [55,82]. The results show that the phase-separated structure, domain size, crystallinity, and molecular orientation of the active layer can be optimized through regulating the diffusivity, the relative rate of nucleation and crystal growth, and the sequence of crystallization of the donor and acceptor [83][84][85].…”

Section: Introductionmentioning

confidence: 99%

The Application of Crystallization Kinetics in Optimizing Morphology of Active Layer in Non-Fullerene Solar Cells

Wan,

Wu,

Jiang

et al. 2024

Energies

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Organic photovoltaics (OPVs) have attracted widespread attention and became an important member of clean energy. Recently, their power conversion efficiency (PCE) has surpassed 19%. As is well known, the morphology of the active layer in OPVs crucially influences the PCE. In consideration of the intricate interactions between the donor molecules and acceptor molecules, the precise control of the morphology of the active layer is extremely challenging. Hence, it is urgent to develop effective methods to fabricate the hierarchical structure of the active layer. One significant driving force for the morphological evolution of the active layer is crystallization. Therefore, regulating the crystallization kinetics is an effective strategy for morphology control. In this review, we present the kinetic strategies recently developed to highlight their significance and effectiveness in morphology control. By applying these kinetic strategies, the hierarchical structure, including phase separation, domain size, crystallinity, and molecular orientation of the active layer can be optimized in different blend systems, leading to an improved PCE of OPVs. The outcomes set the stage for future advancements in device performance.

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“…This Special Issue on "Advanced progress of organic photovoltaics" includes nine papers from different groups,which refer to the theoretical research for excitons generation, charge separation and recombination of OPVs [1], the innovation of active layer materials [2][3][4] and interfacial layer materials [5], the optimization of photoelectric conversion process based on a ternary strategy [6], the investigation of encapsulation technology [7], the reviews related to film-forming kinetic process of OPVs [8], and high efficiency OPVs with PCE over 17% [9].…”

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confidence: 99%

“…Finally, two reviews are summarized from different perspectives, which are related to film-forming kinetic process [8] and the progress of OPVs with PCE over 17% [9], respectively. In Qiuju Liang et al [8] the authors focused on the relationship between the film-forming dynamic process and the active layer morphology of OPVs.…”

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confidence: 99%