Modulation and evaluation of the charge carrier mobility in a polymer alloy of polythiophene and an insulating matrix with an electron accepting molecule

Fukumatsu, Takahiro; Saeki, Akinori; Seki, Shu

doi:10.1039/c5py00796h

Cited by 7 publications

(1 citation statement)

References 85 publications

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“…The electromagnetic waves, often referred to as microwaves, are herein employed for the measurement which has been applied for the measurement of mobility in conjugated polymers (intra-chain mobility) [21][22][23][24][25][26][27][28][29], conjugated organic supramolecular architectures [30][31][32][33][34][35][36][37][38][39][40], molecular crystals [41][42][43][44][45], conjugated organic frameworks [49][50][51], etc.…”

Section: Introductionmentioning

confidence: 99%

Transient Optical-Microwave Spectroscopy for Electron Mobility Assessment in Solids and Gels: A Comprehensive Approach

Matsuda

Sakurai

Ghosh

et al. 2018

J. Photopol. Sci. Technol.

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Organic small molecular semiconductors have been promising candidate for the future electronic materials and devices, and their charge transport potentials have been expected to catch-up and surpass the benchmark one in Si -the giant in the semiconductor materials.As represented in the mobility values observed in graphene with  > 10 4 cm 2 V -1 s -1 , the extended -conjugated electron systems provide highly conductive platforms for electrons and holes, however the charge transport in aggregates of conjugated small molecules is disturbed by inter-molecular thermal fluctuations, resulting in the lower mobility of charge carriers in the molecular systems. We have developed a novel assessment technique of charge carrier mobility on the nanoscale molecular aggregates, referred to as time-resolved microwave conductivity (TRMC) measurement, where the non-contact approach minimizes the inter-aggregates issues in the conventional assessment techniques. Particularly, the combination of TRMC with transient absorption spectroscopy (TAS) realizes herein fully experimental non-contact measurement of mobility in supramolecular architectures without structural modulation of the archtectures in the device fabrication protocols. Electron mobility observed in one-dimensional naphthalenediimide (NDI) stacking structures was determined as  -,1D = 10 -3 -10 -4 cm 2 V -1 s -1 based on the values of photoconductivity  and photo-carrier generation yield  determined by TRMC and TAS, respectively. The NDI stacked structures with a variety of inter-molecular interactions were systematically examined by the combined spectroscopy systems, revealing the remarkable impact of interactions stabilizing the stacking structures on the mobility values.

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Section: Introductionmentioning

confidence: 99%

Transient Optical-Microwave Spectroscopy for Electron Mobility Assessment in Solids and Gels: A Comprehensive Approach

Matsuda

Sakurai

Ghosh

et al. 2018

J. Photopol. Sci. Technol.

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Microwave and Terahertz Spectroscopy

Saeki

2021

Organic Semiconductors for Optoelectronics

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A Dibenzo[g,p]chrysene‐Based Organic Semiconductor with Small Exciton Binding Energy via Molecular Aggregation

Mori,

Jinnai,

Hosoda

et al. 2024

Angewandte Chemie

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Exciton binding energy (Eb) is understood as the energy required to dissociate an exciton in free‐charge carriers, and is known to be an important parameter in determining the performance of organic opto‐electronic devices. However, the development of a molecular design to achieve a small level of Eb in the solid state continues to lag behind. Here, to investigate the relationship between aggregation and Eb, star‐shaped π‐conjugated compounds DBC‐RD and TPE‐RD were developed using dibenzo[g,p]chrysene (DBC) and tetraphenylethylene (TPE). Theoretical calculations and physical measurements in solution showed no apparent differences between DBC‐RD and TPE‐RD, indicating that these molecules possess similar properties on a single‐molecule level. By contrast, pristine films incorporating these molecules showed significantly different levels of electron affinity, ionization potential, and optical gap. Also, DBC‐RD had a smaller Eb value of 0.24 eV compared with that of TPE‐RD (0.42 eV). However, these molecules showed similar Eb values under dispersed conditions, which suggested that the decreased Eb of DBC‐RD in pristine film is induced by molecular aggregation. By comparison with TPE‐RD, DBC‐RD showed superior performances in single‐component organic solar cells and organic photocatalysts. These results indicate that a molecular design suitable for aggregation is important to decrease the Eb in films.

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Modulation and evaluation of the charge carrier mobility in a polymer alloy of polythiophene and an insulating matrix with an electron accepting molecule

Abstract: Non-contact measurements with time-resolved microwave conductivity and absorption spectroscopy offer direct access to the charge carrier mobility in conjugated backbones.

Cited by 7 publications

References 85 publications

Transient Optical-Microwave Spectroscopy for Electron Mobility Assessment in Solids and Gels: A Comprehensive Approach

Transient Optical-Microwave Spectroscopy for Electron Mobility Assessment in Solids and Gels: A Comprehensive Approach

Microwave and Terahertz Spectroscopy

A Dibenzo[g,p]chrysene‐Based Organic Semiconductor with Small Exciton Binding Energy via Molecular Aggregation

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