<i>In Situ</i> Characterization of the Triphase Contact Line in a Brush-Coating Process: Toward the Enhanced Efficiency of Polymer Solar Cells

Guo, Cheng; Gao, Xiaoyu; Lin, Fang‐Ju; Wang, Qianbin; Meng, Lili; Bian, Ruixin; Sun, Yanming; Jiang, Lei; Liu, Huan

doi:10.1021/acsami.8b15746

Cited by 28 publications

(28 citation statements)

References 30 publications

(42 reference statements)

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“…By linear fitting, curves of V drop vs. t gave different slopes (Figure 4 i), suggesting the solvent evaporation speed of | K QD |=1.759 > | K ZnO |=0.929 > | K TFB |=0.649 > | K PEDOT:PSS |=0.287. For the solution with a high evaporation speed, the writing speed should be appropriately increased to match the movable TCL [16] . Based on the evaporation speed, v QD > v ZnO > v TFB > v PEDOT:PSS was deduced, essentially in accordance with experimental results.…”

Section: Figuresupporting

confidence: 69%

“…With enlarging N fiber from 3 (Figure S2) to 25 (Figure 4 e), the uniform velocity distribution in the liquid film remain unchanged, suggesting non‐deteriorated uniformity as the film area increases. On the other hand, the writing speed affects the length of the transition area, as well as the duration time for self‐assemble [16] . The uniform boundary can be obtained under a suitable speed (Figure 4 f), as has been validated by the weak reflux and the uniform velocity distribution when setting the length ( L ) of the liquid film as 200 μm (Figure 4 g).…”

Section: Figurementioning

confidence: 78%

“…For the solution with a high evaporation speed, the writing speed should be appropriately increased to match the movable TCL. [16] Based on the evaporation speed, (Table S1) might relate to both the boiling point and the surface tension of solvents. Curves of q vs. t exhibit zigzag shape for TFB, QDs, and ZnO solutions and line shape for PEDOT:PSS solution (Figure 4 j, S4).…”

Section: Zuschriftenmentioning

confidence: 99%

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Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

et al. 2020

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With increasing the film area/layer, deteriorating in both smoothness and uniformity of thin-films frequently happen, which remains a barrier for making large-area quantum dot light-emitting diodes (QLEDs) by solution processes. Here, we demonstrated a facile all-solution process guided by the conical fiber array to write multi-layer ultrasmooth thin-films directly in centimeter scale. The side-by-side fibrous array helps to align surface tensions at the tri-phase contact line to facilitate large-area homogeneous deposition, which was verified by theoretical simulation. The Laplace pressure along individual conical fiber contributes to the steady liquid transfer. Thin-films with small roughness (< 2.03 nm) and large-area (2 2 cm 2) uniformity were prepared sequentially on the target substrate, leading to large-area highperformance QLEDs. The result offers new insights for fabricating large-area high-performance thin-film devices. Quantum dot light-emitting diodes (QLEDs) have attracted research attentions as the most promising nextgeneration display [1] and lighting [2] devices, because of the narrow spectral emission bandwidths, color tunability, and good photostability. [3] As a multi-layer thin-film device, sequential preparing functional layers on the target substrate were necessary, which have been normally realized by solution processes due to the mild conditions and easy operation. [4] For a high-performance QLED, high-quality thin-films with both small surface roughness and good uniformity are desirable for facilitating not only the charge transport within the film but the charge balance between neighboring layers. [5] So far, solution processes including spin coating, [6] inkjet printing, [7] and transfer printing [8] have been developed. However, these approaches suffered from the nonuniform deposition as the film area/layer increases, which remains a barrier for making large-area QLEDs. With increasing either the print area or the film layer, fluid

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Section: Figuresupporting

confidence: 69%

Section: Figurementioning

confidence: 78%

Section: Zuschriftenmentioning

confidence: 99%

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Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

et al. 2020

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“…On the other hand, the writing speed affects the length of the transition area, as well as the duration time for self-assemble. [16] The uniform boundary can be obtained under a suitable speed (Figure 4 f), as has been validated by the weak reflux and the uniform velocity distribution when setting the length (L) of the liquid film as 200 mm (Figure 4 g). If L is too long (namely, the speed is too fast), mountain-like deposits form at the boundary (Figure 4 f), agreeing well with the strong reflux and the nonuniform fluidic velocity when setting L as 1000 mm (Figure 4 h).…”

Section: Angewandte Chemiementioning

confidence: 63%

Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

et al. 2020

Self Cite

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With increasing the film area/layer, deteriorating in both smoothness and uniformity of thin‐films frequently happen, which remains a barrier for making large‐area quantum dot light‐emitting diodes (QLEDs) by solution processes. Here, we demonstrated a facile all‐solution process guided by the conical fiber array to write multi‐layer ultrasmooth thin‐films directly in centimeter scale. The side‐by‐side fibrous array helps to align surface tensions at the tri‐phase contact line to facilitate large‐area homogeneous deposition, which was verified by theoretical simulation. The Laplace pressure along individual conical fiber contributes to the steady liquid transfer. Thin‐films with small roughness (<2.03 nm) and large‐area (2×2 cm2) uniformity were prepared sequentially on the target substrate, leading to large‐area high‐performance QLEDs. The result offers new insights for fabricating large‐area high‐performance thin‐film devices.

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“…25(p25) Kim et al 88 used a nylon brush to deposit the active layer (P3HT:PCBM) of an OPV and concluded that this is a simple, low-cost and promising technique for the production of large areas on a large scale. The brush coating was applied to the coating of the AgNWs anode in the studies, 54,122 CNT in the studies, 58 of the PEDOT:PSS hole transport layer in the study, 122 of the active layer P3HT:PCBM in the studies, 88,122,123 of the ZnO electron transport layer. 122…”

Section: Brush Coatingmentioning

confidence: 99%

Overview of printing and coating techniques in the production of organic photovoltaic cells

et al. 2020

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The organic photovoltaic cell (OPV) is composed of multiple layers, and some printing and coating techniques are more suitable than others for a certain type of layer. This paper aims to characterize and compare the most relevant coating and printing techniques that can be used in the manufacture of OPVs. Extensive bibliographic research was carried out on articles published from 1998 to 2020 to identify various aspects OPV, such as the principle of operation, advantages, disadvantages, and which layers can be printed by each technique. The results show that the most used method for the processing of OPVs is spin-coating. In the studies found, rotation was used to coat the active layer, the electron transport layer, and the hole transport layer. The techniques of pad printing, casting, and meniscus are considered useful in the processing of the active layer. Regarding the deposition of the active layer, hole transport layer, electron transport layer, and anode, the rotogravure, crack matrix, spraying, and brushing techniques were satisfactory. Flexography has been used to form the active layer, electron transport layer, and anode. Screen printing, inkjet printing, and knife/blade coating were used in the processing of the active layer, hole transport layer, electron transport layer, anode, and cathode. All the double slot die coating, curtain coating, and slide coating allows simultaneous processing of multiple layers. Techniques compatible with roll-to-roll processing are more likely to be at the center of OPVs in the future, thus making solar photovoltaic technology more competitive.

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In Situ Characterization of the Triphase Contact Line in a Brush-Coating Process: Toward the Enhanced Efficiency of Polymer Solar Cells

Cited by 28 publications

References 30 publications

Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

Direct Writing Large‐Area Multi‐Layer Ultrasmooth Films by an All‐Solution Process: Toward High‐Performance QLEDs

Overview of printing and coating techniques in the production of organic photovoltaic cells

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