Control of molecular doping in conjugated polymers by thermal annealing

Fujimoto, Rintaro; Watanabe, Shun; Yamashita, Yu; Tsurumi, Junto; Matsui, Hiroyuki; Kushida, Tomokatsu; Mitsui, Chikahiko; Yi, Hyunjung; Podzorov, Vitaly

doi:10.1016/j.orgel.2017.05.019

Cited by 22 publications

(35 citation statements)

References 35 publications

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“…Moreover, the reduction of α upon decreased temperature suggests a different mechanism of decoherence in conjugated systems, more strongly affected by static disorder . It is of course easier to detect a Hall answer in highly conducting samples and measurements have been performed on several strongly doped conjugated polymers . The signal‐to‐noise ratio being one of the most important criteria in the detection of very small Hall voltages (i.e., µV range for doped conjugated polymers), Podzorov et al improved the measurement technique involving a low frequency magnetic field modulation (AC (alternative current) measurement vs conventional DC (direct current) one) that allowed them to significantly enhance the signal‐to‐noise ratio and eliminate the necessity of using high magnetic fields.…”

Section: Charge Transportmentioning

confidence: 99%

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

et al. 2020

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The field of organic electronics has been prolific in the last couple of years, leading to the design and synthesis of several molecular semiconductors presenting a mobility in excess of 10 cm2 V−1 s−1. However, it is also started to recently falter, as a result of doubtful mobility extractions and reduced industrial interest. This critical review addresses the community of chemists and materials scientists to share with it a critical analysis of the best performing molecular semiconductors and of the inherent charge transport physics that takes place in them. The goal is to inspire chemists and materials scientists and to give them hope that the field of molecular semiconductors for logic operations is not engaged into a dead end. To the contrary, it offers plenty of research opportunities in materials chemistry.

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Section: Charge Transportmentioning

confidence: 99%

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

et al. 2020

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“…The coupling strength between the quasi-1D chains might finally determine the dimensionality of the carriers by introducing interchain' charge delocalization. In previous works, 2D or 3D electron behaviors have been widely observed in semicrystalline doped polymers based on the Hall effect, weak localization effect [27][28][29] , etc., provided by crystalline grains. Interesting, the existence of 1D transport has also been suggested more than once 30,31 , especially with the decrease of interchain coherence, the quasi-1D transport is enhanced 32 .…”

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confidence: 99%

A tied Fermi liquid to Luttinger liquid model for nonlinear transport in conducting polymers

et al. 2021

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Organic conjugated polymers demonstrate great potential in transistors, solar cells and light-emitting diodes, whose performances are fundamentally governed by charge transport. However, the morphology–property relationships and the underpinning charge transport mechanisms remain unclear. Particularly, whether the nonlinear charge transport in conducting polymers is appropriately formulated within non-Fermi liquids is not clear. In this work, via varying crystalline degrees of samples, we carry out systematic investigations on the charge transport nonlinearity in conducting polymers. Possible charge carriers’ dimensionality is discussed when varying the molecular chain’s crystalline orders. A heterogeneous-resistive-network (HRN) model is proposed based on the tied-link between Fermi liquids (FL) and Luttinger liquids (LL), related to the high-ordered crystalline zones and weak-coupled amorphous regions, respectively. The HRN model is supported by precise electrical and microstructural characterizations, together with theoretic evaluations, which well describes the nonlinear transport behaviors and provides new insights into the microstructure-correlated charge transport in organic solids.

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“…To control the mobility of C 8 -DNBDT-NW, an imperfection of SAM was intentionally introduced by reducing the process temperature (~100°C) during vapor deposition process, where the surface contact angle was measured to be 90 degree, (normally 78-82 degree for an ideal single crystal growth). PBTTT was deposited on SAM treated SiO 2 via spin coating from 1.0 wt% of o-dichlorobenzene solution, and then annealed at 180°C for 30 min 45 . IZO was deposited a precleaned SiO 2 substrate via spin coating of a precursor solution, which consists of indium nitrate nonahydrate and zinc nitrate hexahydrate (In : Zn = 3 : 2) dissolved in 2-methoxyethernol.…”

Section: Methodsmentioning

confidence: 99%

Remarkably low flicker noise in solution-processed organic single crystal transistors

et al. 2018

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Low-frequency noise generated by a fluctuation of current is a key issue for integrating electronic elements into a high-density circuit. Investigation of the noise in organic field-effect transistors is now sharing the spotlight with development of printed integrated circuits. The recent improvement of field-effect mobility (up to 15 cm 2 V −1 s −1 ) has allowed for organic integrated circuits with a relatively high-speed operation (~50 kHz). Therefore, an in-depth understanding of the noise feature will be indispensable to further improve the circuit stability and durability. Here we performed noise measurements in solution-processed organic single crystal transistors, and discovered that a low trap density-of-states due to the absence of structural disorder in combination with coherent band-like transport gives rise to an unprecedentedly low flicker noise. The excellent noise property in organic single crystals will allow their potential to be fully exploited for high-speed communication and sensing applications.

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Control of molecular doping in conjugated polymers by thermal annealing

Cited by 22 publications

References 35 publications

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

A tied Fermi liquid to Luttinger liquid model for nonlinear transport in conducting polymers

Remarkably low flicker noise in solution-processed organic single crystal transistors

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