Doping characteristics of isoindoloindole-based conjugated polymer toward robust transformable organic conductor

Park, Jaehong; Yoon, Sang Eun; Kang, Yeongkwon; Lee, Inkyu; Kim, Jong H.; Kim, Bong‐Gi

doi:10.1016/j.orgel.2019.105435

Cited by 13 publications

(19 citation statements)

References 24 publications

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“…To demonstrate the general applicability of the developed hybrid doping method, we applied the method to a different CP, PIDF-BT (Figure 7a), having a relatively lower degree of crystallinity and in the film and higher degree of CT with F4-TCNQ compared to P3HT. [54,55] It has been reported that sequentially doped PIDF-BT film exhibited a high σ 4P of 240 S cm −1 owing to the efficient dopant (F4-TCNQ) diffusion through the free volume of the amorphous domains (c.f. σ of PIDF-BT film doped by the mixture blending process is 5.0 S cm −1 ).…”

Section: Application Of Hybrid Doping To the Isoindoloindole-based Comentioning

confidence: 99%

“…σ of PIDF-BT film doped by the mixture blending process is 5.0 S cm −1 ). [54] To verify if σ of PIDF-BT can be further improved than that of the sequentially soaked film, we applied hybrid doping to PIDF-BT. The current level of the PIDF-BT film doped by the hybrid doping method remarkably increased compared to that obtained from sequential soaking processes (Figure 7b).…”

Section: Application Of Hybrid Doping To the Isoindoloindole-based Comentioning

confidence: 99%

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Exploring Wholly Doped Conjugated Polymer Films Based on Hybrid Doping: Strategic Approach for Optimizing Electrical Conductivity and Related Thermoelectric Properties

Yoon

Kang

Jeon

et al. 2020

Adv Funct Materials

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Conventional chemical doping processes for conjugated polymers (CPs) often degrade the film morphology or cause unsatisfactory doping efficiency owing to the aggregation formation between charged species or insufficient dopant diffusion. In this work, a new strategic doping method, "hybrid doping," is suggested for maximizing the doping efficiency of CPs without hampering the surface morphology of the CP films. The advantage of hybrid doping is that it combines mixture blending and sequential soaking processes. Based on systemic characterizations including spectroscopic, structural, and electrical analyses, it is revealed that hybrid doping enables whole area doping for the crystalline and amorphous regions of CP films, and thus an unprecedentedly high electrical conductivity of up to 81.5 and 639.1 S cm −1 , for poly(3-hexylthiophene) P3HT and poly (2-([2,2′-bithiophen]-5-yl)-3,8-difluoro-5,10-bis(5octylpentadecyl)-5,10-dihydroindolo [3,2-b]indole) (PIDF-BT), respectively, is achieved. Furthermore, the exceptional electrical conductivity compensates a reduced Seebeck coefficient, resulting in excellent power factors up to 26.8 and 76.1 μW m −1 K −2 for thermoelectric devices based on doped-P3HT and PIDF-BT films, respectively, which is among the highest levels for semiconducting CPs. Hybrid doping is a strategic approach for the simultaneous optimization of electrical conductivity and thermoelectric properties of various CPs.

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Section: Application Of Hybrid Doping To the Isoindoloindole-based Comentioning

confidence: 99%

Section: Application Of Hybrid Doping To the Isoindoloindole-based Comentioning

confidence: 99%

Exploring Wholly Doped Conjugated Polymer Films Based on Hybrid Doping: Strategic Approach for Optimizing Electrical Conductivity and Related Thermoelectric Properties

Yoon

Kang

Jeon

et al. 2020

Adv Funct Materials

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“…In this study, we adopted PIDF-BT because modulation of electrical conductivity is available by controlling the degree of crystallinity (the chemical structure of PIDF-BT is shown in Figure a) . Furthermore, an electron-donating indoloindole (IDD) backbone of PIDF-BT promotes efficient CT interaction with the used dopant, tetrafluorotetracyanoquinodimethane (F4-TCNQ).…”

Section: Resultsmentioning

confidence: 99%

“…We first performed UV–vis absorption measurements for as-cast and thermally annealed PIDF-BT films at different temperatures (100, 150, and 200 °C), as shown in Figure b. The annealed PIDF-BT films showed a resolvable absorption band at 560 nm, an indicative of developed intermolecular packing by chain planarization . For the characterization of the charge transport property of the PIDF-BT film, field-effect mobility (μ FET ) was measured using field-effect transistors (FETs) fabricated using a PIDF-BT film.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we examined how the morphology, crystallinity, and doping level of SP affect its thermoelectric parameters. For this purpose, we employed PIDF-BT featuring scalable σ over a wide range, depending on the degree of film crystallinity . By introducing a sequential doping − with a preannealing process on PIDF-BT films for the control of dopant diffusion, we effectively overcame the limitation of the conventional doping method discussed above.…”

Section: Introductionmentioning

confidence: 99%

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High Efficiency Doping of Conjugated Polymer for Investigation of Intercorrelation of Thermoelectric Effects with Electrical and Morphological Properties

Yoon¹,

Kang

Noh

et al. 2019

ACS Appl. Mater. Interfaces

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Intercorrelation of thermoelectric properties of a doped conjugated semiconducting polymer (PIDF-BT) with charge carrier density, conductive morphology, and crystallinity are systematically investigated. Upon being doped with F4-TCNQ by the sequential doping method, PIDF-BT exhibited a high electrical conductivity over 210 S cm–1. The significant enhancement of electrical conductivity resulted from a high charge carrier density, which is attributed to the effective charge–transfer-based integer doping between PIDF-BT and dopant molecules. Based on the systemic characterization on the optical, electrical, and structural properties of doped PIDF-BT annealed at different temperatures, we investigated the characteristic correlations between thermoelectric properties of PIDF-BT films and their four-probe electrical conductivity, charge carrier density, and charge carrier mobility obtained from AC Hall effect measurements. This study revealed that exercising fine control over the crystallinity and conductive migration of the conjugated polymer films can be a strategic approach to suppressing the degradation of the Seebeck coefficient at high charge carrier density and ultimately to maximizing the power factors of organic thermoelectric devices.

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Impact of Molecular Weight on Molecular Doping Efficiency of Conjugated Polymers and Resulting Thermoelectric Performances

Yoon

Kim

Chun

et al. 2022

Adv Funct Materials

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The effect of molecular weight of a series of conjugated polymers (CPs) on the doping efficiency, electrical conductivity, and related thermoelectric properties of doped CPs is studied. Low (L), medium (M), and high (H) molecular weight batches of PDFD-T polymers, based on difluorobenzothiadiazole and dithienosilole moieties, are synthesized and denoted as PDFD-T(L), PDFD-T(M), and PDFD-T(H), respectively. Furthermore, to compare the effects of different donor moieties, donor units of PDFD-T(L) are structurally modified from thiophene to thienothiophene (TT) and dithienothiophene (DTT), denoted as PDFD-TT(L) and PDFD-DTT(L), respectively. After doping the CPs with FeCl 3 , d-PDFD-T(H) exhibits an electrical conductivity of 402.9 S cm −1 , which is significantly higher than those of d-PDFD-T(L), d-PDFD-T(M), d-PDFD-TT(L), and d-PDFD-DTT(L). The highest power factor of 101.1 µW m −1 K −2 is achieved through organic thermoelectric devices fabricated using PDFD-T(H). Through various characterizations, it is demonstrated that CPs with a high molecular weight tend to have a high carrier mobility while maintaining their original crystallinity and good charge transport pathways even after doping. Therefore, it is suggested that optimizing the molecular weight of CPs is an essential strategy for maximal power generation from their doped CP films.

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Doping characteristics of isoindoloindole-based conjugated polymer toward robust transformable organic conductor

Cited by 13 publications

References 24 publications

Exploring Wholly Doped Conjugated Polymer Films Based on Hybrid Doping: Strategic Approach for Optimizing Electrical Conductivity and Related Thermoelectric Properties

Exploring Wholly Doped Conjugated Polymer Films Based on Hybrid Doping: Strategic Approach for Optimizing Electrical Conductivity and Related Thermoelectric Properties

High Efficiency Doping of Conjugated Polymer for Investigation of Intercorrelation of Thermoelectric Effects with Electrical and Morphological Properties

Impact of Molecular Weight on Molecular Doping Efficiency of Conjugated Polymers and Resulting Thermoelectric Performances

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