Solution-processed self-assemble engineering PDI derivative polymorphisms with optoelectrical property tuning in organic field-effect transistors

Liu, Xitong; Xu, Haixiao; Zhou, Yecheng; Yang, Canglei; Liu, Guangfeng; Luo, Lixing; Wang, Wei; Jin, Jianqun; Huang, Wei

doi:10.1016/j.orgel.2020.105777

Cited by 6 publications

(5 citation statements)

References 44 publications

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“…It has also been shown that singlet fission can be enhanced near the edges of rubrene crystals due to the introduction of structural disorder that lowers the symmetry of the crystal . We note that EP-PDI exhibits polymorphism, which suggests that unique structures could be formed at EP-PDI crystal edges that may impact their dynamics. This scenario not only could be responsible for the differences in dynamics observed within the bulk and at the edge of the crystal but also may explain the change in the sign of the signal near the top portion of the crystal.…”

Section: Resultsmentioning

confidence: 99%

Transient Absorption Microscopy Using Widefield Lock-in Camera Imaging

Wilson,

Volek,

Gross

et al. 2024

J. Phys. Chem. C

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Over the past decade, the proliferation of pulsed laser sources with high repetition rates has facilitated a merger of ultrafast time-resolved spectroscopy with imaging microscopy. In transient absorption microscopy (TAM), the excited-state dynamics of a system are tracked by measuring changes in the transmission of a focused probe pulse following photoexcitation of a sample. Typically, these experiments are done using a photodiode detector and lock-in amplifier synchronized with the laser and images highlighting spatial heterogeneity in the TAM signal are constructed by scanning the probe across a sample. Performing TAM by instead imaging a spatially defocused widefield probe with a multipixel camera could dramatically accelerate the acquisition of spatially resolved dynamics, yet approaches for such widefield imaging generally suffer from reduced signalto-noise due to an incompatibility of multipixel cameras with high-frequency lock-in detection. Herein, we describe implementation of a camera capable of high-frequency lock-in detection, thereby enabling widefield TAM imaging at rates matching those of high repetition rate lasers. Transient images using a widefield probe and two separate pump pulse configurations are highlighted. In the first, a widefield probe was used to image changes in the spatial distribution of photoexcited molecules prepared by a tightly focused pump pulse, while in the second, a widefield probe detected spatial variations in photoexcited dynamics within a heterogeneous organic crystal excited by a defocused pump pulse. These results highlight the ability of high-sensitivity lock-in detection to enable widefield TAM imaging, which can be leveraged to further our understanding of excited-state dynamics and excitation transport within spatially heterogeneous systems.

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Section: Resultsmentioning

confidence: 99%

Transient Absorption Microscopy Using Widefield Lock-in Camera Imaging

Wilson,

Volek,

Gross

et al. 2024

J. Phys. Chem. C

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“…Among the solution processable OSCs, N , N ′-dipentyl-3,4,9,10-perylenedicarboximide (PTCDI-C 5 ) is a perylene tetracarboxylic-diimide (PTCDI) derivative that has been widely studied as an n -type OSC owing to its molecular design with a conjugated polyaromatic perylene backbone, which has high electron affinity and strong π–π stacking interaction. − It is also a potential material for the solution process because the additional side chains introduced to the perylene backbone increase the solubility for typical organic solvents. However, previously reported results of solution-processed PTCDI-C 5 crystals on Si/SiO 2 substrate indicated low charge carrier mobility (μ FET ∼ 6.9 × 10 –5 cm 2 /V·s) under ambient conditions (with rapid deterioration after a few hours without a passivation layer) or vacuum or N 2 conditions, , similar to the transistors with a thermally deposited thin film layer. , Recently, OFETs with a combination of PTCDI-C 5 crystals and other OSC materials were reported to form via solution pinning and were successfully fabricated and characterized as ambipolar transistors or phototransistors under ambient conditions. − However, the electronic characteristics of PTCDI-C 5 crystal-based devices have not been thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Gated Transistors with Only One Solution-Processed, Single Crystalline Organic Microwire for Light and Oxygen Detection

Lee

Tarsoly

Shin

et al. 2023

ACS Appl. Mater. Interfaces

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Organic semiconductors employed in single crystalline form have several advantages over polycrystalline films, such as higher charge carrier mobility and better environmental stability. Herein, we report the fabrication and characterization of a solution-processed microsized single-crystalline organic wire of n-type N,N′-dipentyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C 5 ). The crystal was applied as an active layer in polymer-gated organic field-effect transistors (OFETs) and organic complementary inverter circuits. The single crystaiiline nature of PTCDI-C 5 wires were characterized using two-dimensional grazing incidence wide-angle X-ray diffraction (2D-GIXD) and polarized optical microscopy. OFETs with the PTCDI-C 5 crystals exhibited high n-type performance and air stability under ambient conditions. To investigate the electrical properties of the singlecrystalline PTCDI-C 5 wire more precisely, OFETs with only one PTCDI-C 5 microwire in the channel were fabricated, and clear n-type characteristics with satisfactory saturation behavior were observed. The device with only one crystal wire exhibited characteristics with significantly lower variation compared to the multicrystal devices, which shows that the density of crystal wires is a critical factor in precisely investigating device performance. The devices exhibited a reversible threshold voltage shift under vacuum and oxygen conditions, without changing the charge carrier mobility. Light-sensitive characteristics were also observed. Additionally, this solution-processed, highly crystalline organic semiconductor can be used in high-performance organic electronic circuits as well as in gas or light sensors.

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Section: Introductionmentioning

confidence: 99%

“…36,37 Therefore, the selective growth of BTR nanocrystals with controlled morphology for generating 1D and 2D structures is crucial since the fundamental chemical and physical properties may be very different, which may lead to different applications. 33,[38][39][40] In this work, we grow BTR single crystals with two types of morphologies by liquid-phase methods: BTR micro-ribbons and 2D crystal films. We fabricated the BTR micro-ribbons using the self-assembly process of reprecipitation in liquid and obtained the BTR 2D crystal film using the two-dimensional spatial confinement method.…”

Section: Introductionmentioning

confidence: 99%