Impact of substituents on the performance of small-molecule semiconductors in organic photovoltaic devices <i>via</i> regulating morphology

Suzuki, Mitsuharu; Suzuki, Kaho; Won, Taehyun; Yamada, Hiroko

doi:10.1039/d1tc04237h

Cited by 9 publications

(8 citation statements)

References 174 publications

(214 reference statements)

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“…Various cases for improving solubility or maximizing the performance of semiconductor materials by introducing diverse substituents into the semiconductor molecules have been reported, but many of these semiconductor materials were produced by being processed using a chlorine-based solvent. [97][98][99][100][101] Therefore, in describing the strategy of introducing substituents into the backbone, only cases using non-chlorinated solvents are reviewed. Ye and co-workers deployed an oxetane group as a substituent of polythiophenes (PTs), a representative class of p-type OSCs (PTHOT), to improve the solubility of the PTs in environmentally friendly solvents.…”

Section: Designs Of Organic Semiconductors Amenable To Environmentall...mentioning

confidence: 99%

Current developments of eco-friendly organic field-effect transistors: from molecular engineering of organic semiconductors to greener device processing

Kim

Lee

et al. 2023

Chem. Commun.

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Section: Designs Of Organic Semiconductors Amenable To Environmentall...mentioning

confidence: 99%

Current developments of eco-friendly organic field-effect transistors: from molecular engineering of organic semiconductors to greener device processing

Kim

Lee

et al. 2023

Chem. Commun.

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“…[52] Therefore, for smallmolecular OSCs, morphology control and stacking mode are still the key factors determining their overall performance. [13,[53][54][55][56][57] It is well known that the selection of solvent has a significant impact on the morphology of the active layer. [58] For example, a solvent with a high boiling point can give more time for the effective self-assembly of materials due to its slow volatilization.…”

Section: Introductionmentioning

confidence: 99%

Molecular Orientation‐Dependent Exciton Separation in Optimized Single‐Component Y6 Organic Solar Cells

et al. 2023

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The excitons are generally decomposed into free charges by the heterojunction due to the low dielectric constant of organic materials. Recent research indicates that owing to the low exciton binding energy, the pure Y6 film can directly and spontaneously generate free charge carriers after photoexcitation, even without the assistance of the donor/acceptor interface driving force. However, the serious bimolecular recombination and trap‐assisted recombination also limit the photovoltaic efficiency of single‐component Y6 devices. Herein, efficient exciton separation and charge collection by changing the buffer layer and using mixed solvents to control the active layer morphology of single‐component devices based on Y6 are achieved. It is found that the short‐circuit current is significantly increased by properly adjusting the proportion of face‐on and edge‐on direction of molecules. Eventually, the power conversion efficiency (PCE) of single‐component devices based on Y6 is increased from 0.15% to 1.41%. The corresponding dynamic process is revealed by ultrafast transient absorption spectroscopy and entropy effect on the exciton dissociation. Effective charge separation and collection in single‐component devices is not only critical to improving the PCE, but provides an in‐depth understanding for the further design of high‐performance multicomponent devices.

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“…The first is characterized by the domains’ size, purity, connectivity, and crystallinity. The second is related to the intermolecular arrangement or molecular packing in the interfaces and the bulk of the domains [ 7 , 8 , 9 ]. However, the characteristics of active layer morphology for optimal performance are not known yet [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Morphology Determines an Efficient Coherent Electron Transport for Push–Pull Organic Semiconductors Based on Triphenylamine and Dicyanovinyl Groups

2023

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The morphology of the active layer in organic solar cells is fundamental for achieving high power conversion efficiency. However, the morphological characteristics for optimal performance are still being investigated. An atomistic computational approach is required to determine the relationship between active layer morphology and performance. Since the organic solar cell has multiple phases and interfaces, the computational modeling of charge generation and transport is challenging. We then used a set of push–pull semiconductors to illustrate how the electronic transmission spectrum, derived from the Landauer–Büttiker formalism, can be used to investigate the efficiency of coherent charge transport across anisotropic organic solids. The electronic transmission spectrum was calculated from the electronic band structure obtained using the density-functional-based tight-binding method. We found that coherent charge transport was more efficient along the direction parallel with the interface between the electron-acceptor and electron-donor moieties for a herringbone morphology.

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Impact of substituents on the performance of small-molecule semiconductors in organic photovoltaic devices via regulating morphology

Abstract: This review summarizes recent prominent examples of substituent engineering on small-molecule organic semiconductors for photovoltaic applications, focusing on flexible substituents that regulate the active-layer morphology.

Cited by 9 publications

References 174 publications

Current developments of eco-friendly organic field-effect transistors: from molecular engineering of organic semiconductors to greener device processing

Current developments of eco-friendly organic field-effect transistors: from molecular engineering of organic semiconductors to greener device processing

Molecular Orientation‐Dependent Exciton Separation in Optimized Single‐Component Y6 Organic Solar Cells

Morphology Determines an Efficient Coherent Electron Transport for Push–Pull Organic Semiconductors Based on Triphenylamine and Dicyanovinyl Groups

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