Real-time views of morphological evolution in solution-processed organic photovoltaics

Liu, Yanfeng; Jin, Yingzhi; Wu, Yue; Zhong, Yufei

doi:10.1039/d2tc02185d

Cited by 4 publications

(1 citation statement)

References 140 publications

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“…The evolution of the Y6 characteristic peak position was tracked with film formation time and four stages were identified: (1) solvent evaporation stage, where the Y6 peak position does not change; (2) weak redshift of the peak position, representing the molecule nucleation stage as the solvent evaporates to reach the critical point of material saturation solubility; (3) significant redshift of the peak position, representing the molecular crystal growth stage as the solvent continues to evaporate beyond the saturation solubility; (4) stable peak position, representing the film formation stage as the solvent completely evaporates and the molecular crystal growth ends. 31–35 Fig. S2 (ESI†) shows that Y6 undergoes nucleation and crystal growth once in the blade-coated Y6( o -XY) film with the evaporation of o -XY; while Y6 undergoes nucleation and crystal growth twice in the blade-coated Y6( o -XY + DMN) film, first with the evaporation of the primary solvent o -XY and partial DMN additive, and second with the further evaporation of the higher boiling point DMN additive.…”

Section: Resultsmentioning

confidence: 99%

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Li,

Wu,

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Li,

Wu,

et al. 2023

J. Mater. Chem. C

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Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Peña

Xie

et al. 2024

Advanced Materials

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Using two structurally similar polymer acceptors in constructing high‐efficiency ternary all‐polymer solar cells is a widely acknowledged strategy. However, the focus thus far has not been on how polymer acceptor(s) tune the aggregation of polymer donors, thus furthering film morphology and device performance (efficiency and stability). Herein, w e report that matching the celebrity acceptor PY‐IT and donor PBQx‐TCl results in enhanced H‐aggregation in PBQx‐TCl, which can be finely tuned by controlling the amount of the second acceptor PY‐IV. Consequently, the efficiency‐optimized PY‐IV weight ratio (0.2/1.2) leads to state‐of‐the‐art power conversion efficiency of 18.81%, wherein light‐illuminated operational stability is also enhanced along with well‐protected thermal stability. Such enhancements in the efficiency and operational and thermal stabilities of solar cells can be attributed to morphology optimization and desired glass transition temperature of the target active layer based on comprehensive characterization. In addition to being a high‐power conversion efficiency case for all‐polymer solar cells, these enhancements are also a successful attempt for using combined acceptors to tune donor aggregation toward optimal morphology, which provides a theoretical basis for the construction of other types of organic photovoltaics beyond all‐polymer solar cells.This article is protected by copyright. All rights reserved

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Thickness Insensitive Organic Solar Cells with High Figure‐of‐Merit‐X Enabled by Simultaneous D/A Interpenetration and Stratification

Xie,

Ma,

Luo

et al. 2024

Advanced Energy Materials

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Low cost and printing friendly fabrication of organic solar cells (OSCs) require thick‐film devices with simply structured photoactive molecules. Thus, achieving high power conversion efficiency (PCE) for non‐fused ring acceptor‐based devices with high thickness is of great significance. Herein, by transforming traditional blend casting method to emerging sequential deposition (SD) method, D18:A4T‐16 active blend exhibits large efficiency improvement from 8.02% to 14.75% in 300 nm thick devices. Systematic morphological and photophysical characterizations showcase the effectiveness of SD processing in achieving sufficient donor/acceptor interpenetration and vertical stratification, which eliminates the dilemma of charge generation/transport in blend casting films. Meanwhile, D18 bottom layer is proven helpful in realizing fast evaporation of postdeposited poor solvent, resulting in naturally thickened active layer with well‐regulated crystallization. Furthermore, a new index to emphasize thick‐film devices based on nonfused ring acceptors, called figure‐of‐merit‐X (FoM‐X), has been defined. The SD processed D18:A4T‐16 devices herein, with 300 nm, 500 nm, and 800 nm thicknesses possess leading FoM‐X values.

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Real-time views of morphological evolution in solution-processed organic photovoltaics

Abstract: The nanoscale morphology of the photoactive layer in solution-processed organic photovoltaics plays a critical role in device performance. Such intricate morphology is sensitive to the processing condition during film formation....

Cited by 4 publications

References 140 publications

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Layer-by-layer blade-coated organic solar cells with non-halogenated solvents and non-halogenated additive via adjusting morphology and crystallization

Tunable Donor Aggregation Dominance in a Ternary Matrix of All‐Polymer Blends with Improved Efficiency and Stability

Thickness Insensitive Organic Solar Cells with High Figure‐of‐Merit‐X Enabled by Simultaneous D/A Interpenetration and Stratification

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