Highly thermally stable non-fullerene organic solar cells: p-DTS(FBTTh2)2:P(NDI2OD-T2) bulk heterojunction

Kim, Yu Jin; Chung, Dae Sung; Park, Jin Young

doi:10.1016/j.nanoen.2015.04.035

Cited by 44 publications

(34 citation statements)

References 40 publications

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“…There are extensive analyses available in the literature for correlating crystalline morphology characteristics with electronic device performance for P3HT, [73][74][75][76][77][78] PTB7, [20,42,46,[79][80][81][82] DTS, [33,[83][84][85][86][87] and many other materials. To achieve a desired performance gain, these guidelines must then be paired with the appropriate understanding of the relationship between crystalline morphology and device performance in the specific material examined.…”

Section: Guidelines For Solvent/additive Selectionmentioning

confidence: 99%

In Situ Analysis of Solvent and Additive Effects on Film Morphology Evolution in Spin‐Cast Small‐Molecule and Polymer Photovoltaic Materials

Manley

Strzalka

Fauvell

et al. 2018

Advanced Energy Materials

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indicate the realistic possibility of new soft matter technologies. Note that these highperformance laboratory devices are often produced via spin-coating, a reliable fabrication process that enables rapid prototyping and basic research. However, the transition to high throughput film fabrication processes such as blade-coating, roll-to-roll printing, and others will require understanding of film morphology-forming mechanisms operative in spin-coating processes that optimize organic device performance. [13] Traditionally, optimizing device performance relied on empirical screening of spin-casting para meters such as solvent, processing additive, and spin speed, followed by postprocessing analysis of which morphologies are produced by which coating conditions. [14][15][16] For OSC film morphology, grazing incidence wide-angle X-ray scattering (GIWAXS) is especially powerful for monitoring crystallinity, orientation, donor-acceptor intermixing, [14][15][16][17][18] and developing an ex post facto understanding basis for otherwise completely empirical "recipes." While informative, postdeposition analysis can miss important temporal characteristics of film growth processes which can only be identified by in situ techniques. In situ film growth studies utilizing GIWAXS and other techniques during film deposition and drying have been employed by several groups, including our own, to understand crystalline morphology development in organic electronic thin films. [19,20] Characterizing morphology during the film formation process can elucidate important mechanistic pathways and inform rational solution processing parameter optimization.Several recent studies have reported in situ optical and X-ray analyses of organic film growth by roll-to-roll printing, [21] blade To elucidate the details of film morphology/order evolution during spin-coating, solvent and additive effects are systematically investigated for three representative organic solar cell (OSC) active layer materials using combined in situ grazing incidence wide angle x-ray scattering (GIWAXS) and optical reflectance. Two archetypical semiconducting donor (p-type) polymers, P3HT and PTB7, and semiconducting donor small-molecule, p-DTS(FBTTh 2 ) 2 are studied using three neat solvents (chloroform, chlorobenzene, 1,2-dichlorobenzene) and four processing additives (1-chloronaphthalene, diphenyl ether, 1,8-diiodooctane, and 1,6-diiodohexane). In situ GIWAXS identifies several trends: 1) for neat solvents, rapid crystallization occurs that risks kinetically locking the material into multiple crystal structures or crystalline orientations; and 2) for solvent + additive processed films, morphology evolution involves sequential transformations on timescales ranging from seconds to hours, with key divergences dependent on additive/ semiconductor molecular interactions. When π-planes dominate the additive/semiconductor interactions, both polymers and small molecule films follow similar evolutions, completing in 1-5 min. When side chains dominate the additive/semiconductor...

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Section: Guidelines For Solvent/additive Selectionmentioning

confidence: 99%

In Situ Analysis of Solvent and Additive Effects on Film Morphology Evolution in Spin‐Cast Small‐Molecule and Polymer Photovoltaic Materials

Manley

Strzalka

Fauvell

et al. 2018

Advanced Energy Materials

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“…Very recently, Li and co‐workers employed the PBDT‐FBTA as the donor and the N3 as the acceptor to obtain an all‐polymer OSCs with a much higher PCE performance of 8.27% and the relative V oc , J sc , and FF values were 0.83 V, 14.18 mA cm −2 , and 0.7, respectively . It was worth noting that this series of acceptors possessed a much higher FF values . Soon after, Kim group employed the N3 acceptor and the polymer donor PPDT2FBT to fabricate the all‐polymer solar cells, and studied the effect of polymer molecular weight on the polymer aggregation and phase separation.…”

Section: Nonfullerene Polymer‐based Acceptorsmentioning

confidence: 99%

Recent Advances in Nonfullerene Acceptors for Organic Solar Cells

Liu

Hou

et al. 2017

Macromol. Rapid Commun.

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Recently, research on nonfullerene acceptors in organic solar cells has gradually become a hot topic due to such superior characteristics of light absorption and energy-level-convenient manipulation, multiformity of the photoactive material structures, as well as the extensive area in production compared to the fullerene derivatives. However, the nonfullerene acceptors evolved slowly before 2012 and, as a matter of fact, the power conversion efficiency values could only bear 2.0%. Strikingly, nonfullerene acceptors have developed at a fast pace since 2013, with the best device performance of 13.1% now. In this review, recent research progress on nonfullerene acceptors, including small molecules and polymers, are sorted and summarized on the basis of the different characteristics.

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“…Li et al reported a novel nonfullerene electron acceptor in which a spirobifluorene core is equipped with four benzene end‐capped diketopyrrolopyrrole moieties, and concluded that the cross‐shaped molecular geometry that suppresses strong intermolecular aggregation allows the resulting OSCs to have excellent thermal stabilities upon thermal treatment at 150 °C for up to 3 h . As another example of a nonfullerene BHJ system, Park's group demonstrated that a new BHJ system consisting of a small‐molecule donor (p‐DTS(FBTTh 2 ) 2 ) with low diffusion kinetics and a polymeric acceptor (P(NDI2OD‐T2)) can stabilize the BHJ morphology and lead to thermally stable OSC performance even at high temperature of 180 °C …”

Section: Device Stabilitymentioning

confidence: 99%

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

et al. 2016

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The past two decades of vigorous interdisciplinary approaches has seen tremendous breakthroughs in both scientific and technological developments of bulk-heterojunction organic solar cells (OSCs) based on nanocomposites of π-conjugated organic semiconductors. Because of their unique functionalities, the OSC field is expected to enable innovative photovoltaic applications that can be difficult to achieve using traditional inorganic solar cells: OSCs are printable, portable, wearable, disposable, biocompatible, and attachable to curved surfaces. The ultimate objective of this field is to develop cost-effective, stable, and high-performance photovoltaic modules fabricated on large-area flexible plastic substrates via high-volume/throughput roll-to-roll printing processing and thus achieve the practical implementation of OSCs. Recently, intensive research efforts into the development of organic materials, processing techniques, interface engineering, and device architectures have led to a remarkable improvement in power conversion efficiencies, exceeding 11%, which has finally brought OSCs close to commercialization. Current research interests are expanding from academic to industrial viewpoints to improve device stability and compatibility with large-scale printing processes, which must be addressed to realize viable applications. Here, both academic and industrial issues are reviewed by highlighting historically monumental research results and recent state-of-the-art progress in OSCs. Moreover, perspectives on five core technologies that affect the realization of the practical use of OSCs are presented, including device efficiency, device stability, flexible and transparent electrodes, module designs, and printing techniques.

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Highly thermally stable non-fullerene organic solar cells: p-DTS(FBTTh2)2:P(NDI2OD-T2) bulk heterojunction

Cited by 44 publications

References 40 publications

In Situ Analysis of Solvent and Additive Effects on Film Morphology Evolution in Spin‐Cast Small‐Molecule and Polymer Photovoltaic Materials

In Situ Analysis of Solvent and Additive Effects on Film Morphology Evolution in Spin‐Cast Small‐Molecule and Polymer Photovoltaic Materials

Recent Advances in Nonfullerene Acceptors for Organic Solar Cells

Bulk‐Heterojunction Organic Solar Cells: Five Core Technologies for Their Commercialization

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