Tuning the nanostructure and molecular orientation of high molecular weight diketopyrrolopyrrole-based polymers for high-performance field-effect transistors

Deng, Junyang; Guo, Yifu; Li, Weiwei; Xie, Zhenhua; Ke, Yubin; Janssen, Raj René; Li, Meng Meng

doi:10.1039/d2nr05382a

Cited by 7 publications

(7 citation statements)

References 51 publications

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“…[35,36] Li et al observed that the orientation of diketopyrrolopyrrole (DPP) polymers changes the electrical properties including transfer behavior and carrier mobility. [37] To control this orientation, DPP-based polymers typically modulate the packing texture through functional substituents such as side chains or conjugated segments. [38][39][40][41] Despite these attempts, DPP is not easily electrochemically doped by anion dopants, resulting in short-term plasticity (STP) or short retention time, which limits its use in artificial synapse implementation.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Role of Side Chain for Improving Nonvolatile Characteristics of Conjugated Polymers‐Based Artificial Synapse

Sung,

Chung,

Jang

et al. 2024

Advanced Science

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Interest has grown in services that consume a significant amount of energy, such as large language models (LLMs), and research is being conducted worldwide on synaptic devices for neuromorphic hardware. However, various complex processes are problematic for the implementation of synaptic properties. Here, synaptic characteristics are implemented through a novel method, namely side chain control of conjugated polymers. The developed devices exhibit the characteristics of the biological brain, especially spike‐timing‐dependent plasticity (STDP), high‐pass filtering, and long‐term potentiation/depression (LTP/D). Moreover, the fabricated synaptic devices show enhanced nonvolatile characteristics, such as long retention time (≈102 s), high ratio of Gmax/Gmin, high linearity, and reliable cyclic endurance (≈103 pulses). This study presents a new pathway for next‐generation neuromorphic computing by modulating conjugated polymers with side chain control, thereby achieving high‐performance synaptic properties.

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Section: Introductionmentioning

confidence: 99%

Unveiling the Role of Side Chain for Improving Nonvolatile Characteristics of Conjugated Polymers‐Based Artificial Synapse

Sung,

Chung,

Jang

et al. 2024

Advanced Science

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“…1,13−15 However, the strong aggregation property of DPP-based polymers can lower the solubility of the polymer in organic solvents and limit the types of available solvents or solution processes in fabricating devices. 11,16,17 In this study, we designed a new DPP-based polymer with long and branched alkyl side chains to improve the solubility of DPP polymers. The new DPP-based polymer, poly[2,5-bis(7decylnonadecyl)pyrrolo [3,4-c]pyrrole-1,4-(2H,5H)-dione-2,2′-dyl-alt-thieno[3,2,-b]thiophen-2,5-dyl] (P29DPP-TT), have DPP moieties as electron-deficient cores, electron-rich thienothiophene units, and thiophenes as bridges (Figure 1a).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Diketopyrrolopyrrole (DPP)-based polymers have emerged as one of the most useful candidates to make applications in electronic devices such as organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). − The DPP-conjugated moiety has a planar and rigid structure and is able to form hydrogen bonds, which facilitate molecular assembly and promote crystallization. ,− However, the strong aggregation property of DPP-based polymers can lower the solubility of the polymer in organic solvents and limit the types of available solvents or solution processes in fabricating devices. ,, …”

Section: Introductionmentioning

confidence: 99%

Facile Direct Printing of DPP-Based Polymers for Organic Field-Effect Transistors and Logic Gates

Hong

Kim

et al. 2023

ACS Appl. Electron. Mater.

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Polymer semiconductors having solubility in organic solvents can enable facile, low-cost, and large-area solution processes to fabricate electronic devices with various applications. However, it has been a challenge to build complicated circuits by using them due to device-to-device variation. In this study, we designed a diketopyrrolopyrrole (DPP)-based polymer with long and branched alkyl side chains to improve the solubility of DPP polymers. While the long and branched side chains are introduced to the DPP moieties for improved solubility, the far branching point in the side chains was expected to prevent severe steric hindrance of the long side chains and to allow DPP moieties to have π–π interactions and form crystalline structures. To examine the feasibility of using P29DPP-TT as a semiconductor in integrated electronic systems, the electrohydrodynamic (EHD) jet printing technique was used in for local area patterning. The organic field-effect transistors (OFETs) incorporating EHD-printed P29DPP-TT yield promising field-effect mobility (μFET) of 0.55 cm2 V–1 s–1. Complementary inverters and NAND/NOR logic gates were also realized by fabricating OFETs with line-printed P29DPP-TT and polymer gate dielectrics. It indicates that P29DPP-TT with excellent solubility can be applied to solution-processed integrated electronic devices.

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“…Previous reports suggested that the molecular effects can influence polymer aggregation in materials, and the photoactive layer morphology has profound effects on the photovoltaic properties and stability of PSCs. − Specifically, the crystallinity of conjugated polymer films determines charge transport in the vertical direction. Moreover, solution processing methodologies can effectively control the polymer chain packing structure and subsequent film morphology.…”

Section: Introductionmentioning

confidence: 99%

“…8 In general, PSC photovoltaic performance is strongly dependent on the chemical and condensed-state structures of conjugated polymers, photovoltaic active layer morphology, and device structure, upon which major efforts have been focused to date. 9−12 Previous reports suggested that the molecular effects can influence polymer aggregation in materials, 13 and the photoactive layer morphology has profound effects on the photovoltaic properties and stability of PSCs. 14−18 Specifically, the crystallinity of conjugated polymer films determines charge transport in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Solid Transfer Process of Ordered Structures in Efficient Polymer Photovoltaic Materials

Ren,

Wang,

et al. 2023

ACS Appl. Polym. Mater.

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The single-chain conformations and aggregated structures of conjugated polymers in precursor solutions affect the morphology of films and their photoelectric properties. Dynamic/static light scattering, small-angle neutron scattering, highresolution transmission electron microscopy, and selected area electron diffraction were employed to elucidate the single-chain conformations and aggregated structures of efficient donor polymers (PBDT-TTz and D18-Cl) in chloroform (CF, nonaromatic solvent) and chlorobenzene (CB, aromatic solvent) for a range of concentrations (0.03−5.0 mg/mL). D18-Cl presented a more rigid and extended chain conformation in dilute CF solution. However, the relatively flexible PBDT-TTz easily formed π−π interaction with the aromatic CB molecules, thereby extending the main chain's conjugation length. Regulation of the extended single-chain conformation in dilute solution resulted in the formation of a compact, ordered aggregated structure at increased concentrations. In the liquid−solid cross-phase transfer process, the ordered structures in the precursor solution were effectively inherited by the subsequent films. From dilute to concentrated solutions, the multistage self-assembled structures of conjugated polymers directly affected their solid-state packing and photoelectric properties of the resulting films. Through the regulation of the ordered aggregation in their precursor solution, the hole mobilities of PBDT-TTz and D18-Cl were increased by nearly an order of magnitude, and the power conversion efficiency of the solar cells was enhanced by 28.8%.

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Tuning the nanostructure and molecular orientation of high molecular weight diketopyrrolopyrrole-based polymers for high-performance field-effect transistors

Abstract: As a versatile class of semiconductors, diketopyrrolopyrrole (DPP)-based conjugated polymers are well-suited for application of next-generation plastic electronics because of their excellent and tunable optoelectronic properties via rational design of...

Cited by 7 publications

References 51 publications

Unveiling the Role of Side Chain for Improving Nonvolatile Characteristics of Conjugated Polymers‐Based Artificial Synapse

Unveiling the Role of Side Chain for Improving Nonvolatile Characteristics of Conjugated Polymers‐Based Artificial Synapse

Facile Direct Printing of DPP-Based Polymers for Organic Field-Effect Transistors and Logic Gates

Liquid–Solid Transfer Process of Ordered Structures in Efficient Polymer Photovoltaic Materials

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