Manipulate organic crystal morphology and charge transport

He, Zhengran; Asare‐Yeboah, Kyeiwaa; Zhang, Ziyang; Bi, Sheng

doi:10.1016/j.orgel.2022.106448

Cited by 28 publications

(20 citation statements)

References 183 publications

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“…[4][5][6][7] At the same time, many efforts have been made to enhance the charge transport properties of small molecules that play a crucial role in improving device performance. 8,9 Charge carrier mobility (m) is strongly related to the crystallinity of materials, and the microstructure and morphology of thin films. 10,11 Many amorphous organic semiconductors show low charge mobilities in the range of 10 À5 -10 À3 cm 2 V À1 s À1 , while m values of highly crystalline small molecules can exceed 10 cm 2 V À1 s À1 .…”

Section: Introductionmentioning

confidence: 99%

“…10,11 Many amorphous organic semiconductors show low charge mobilities in the range of 10 À5 -10 À3 cm 2 V À1 s À1 , while m values of highly crystalline small molecules can exceed 10 cm 2 V À1 s À1 . 8 Unfortunately, the synthesis and purification of highly crystalline p-conjugated molecules as well as growth of single-crystals are difficult. Moreover, the poor solubility of crystalline materials in common organic solvents hinders the fabrication of electronic devices by high-throughput printing technologies.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the charge transport characteristics in ordered small-molecule organic semiconductors by side-chain engineering and fluorine substitution

Kuznetsov

Anokhin

Piryazev

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tailoring the charge transport characteristics in ordered small-molecule organic semiconductors by side-chain engineering and fluorine substitution

Kuznetsov

Anokhin

Piryazev

et al. 2022

Phys. Chem. Chem. Phys.

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“…For example, TIPS pentacene, when deposited via the method of drop casting, can exhibit dendritic structures of morphology with each organic crystal pointing in different directions. [44][45][46][47][48][49] The organic semiconductor 5,6,11,12-tetrachlorotetracene was also reported to exhibit multiple layers of misoriented wires stacking upon one another. 50 The 2,5-di-(2-ethylhexyl)-3,6-bis(5 00 -n-hexyl-2,2 0 , 5 0 ,2 00 ]terthiophen-5-yl)-pyrrolo [3,4-c]pyrrole-1,4-dione (SMDPPEH) semiconductor from drop casting in a single solvent showed star-shaped organic crystals while a majority of semiconductors formed aggregations on the substrate without full crystallization.…”

Section: Background and Challengesmentioning

confidence: 99%

Binary solvent engineering for small-molecular organic semiconductor crystallization

Zhang

Asare‐Yeboah

et al. 2023

Mater. Adv.

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“…In the solution-based techniques, external forcebased, additive-based, and binary solvent-based techniques are often employed to drive a sequential self-assembly of the molecular solutes in each pattern unit. [27,28] This gradient crystallization exerted by external forces is also helpful to align the inter-pattern orientation to some extent; however, realizing homogeneous orientation among all the isolated pattern units is still a hard task. Likewise, vapor growth of patterns constituted of discrete anisotropic single crystals is essentially different with deposition of the isotropic amorphous or polycrystalline patterns; in the latter process one need not to concern about control of the crystallographic orientation but only to confine the deposition positions.…”

Section: Introductionmentioning

confidence: 99%

Homogeneously Oriented Organic Single‐Crystalline Patterns Grown by Microspacing In‐Air Sublimation

Lin

Guo

et al. 2023

Small Methods

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tial to develop a patterning technology to grow discrete organic crystals at desired positions. [6,7] However, due to the poor controllability of the crystallization process for the large-conjugated molecules, the prepared organic semiconductor crystals often suffer from random location, limited and ununiform crystal size, and disordered crystallographic orientation arrangement, which impede the subsequent device construction on them. [8][9][10][11][12][13] Compared with the preparation of continuous crystalline films of organic semiconductors, the essential points to grow discrete single-crystalline patterns are to align the crystallographic orientation among the patterns besides controlling their deposition locations. Because the intermolecular packing mode differs along different directions in the anisotropic single crystals, the carrier transporting channels have intrinsic dependence on the crystallographic orientation. [14] In the reported patterning strategies the solution-based techniques are most widely used, wherein photolithography is usually adopted to define the locations of the patterns assisted by self-assembled monolayers or surface microstructures. [2,[15][16][17][18][19][20] Such solution patterning is regarded to be facile to handle and low-cost; nevertheless, as an inherent drawback of solution-based techniques, the residual solvent molecules may act as vulnerabilities that affect the stability and ruin the electron conductance. [21,22] Another notable fact is that the solution method is not applicable to organic semiconductors with rigid structures because they are difficult to dissolve in most organic solvents. In contrast, the vaporbased techniques have been well-established in the commercialized organic light-emitting diodes manufacturing, wherein vacuum deposition assisted by fine metal masks has proved its feasibility in high resolution and high throughput. [23,24] Similarly, vapor deposition of organic single crystals also provides with high purity and high quality, without worries about solvent residue or the poor solubility of the rigid organic semiconductors in organic solvents. [25,26] Compared to the control over growth positions, to align the crystallographic orientation among the discrete anisotropic single crystal patterns is more intractable. Taking pentacene as an example, the mobility when the crystallographic long axis is parallel with the channel direction is about tenfold higher than Fabrication of single-crystalline organic semiconductor patterns is of key importance to enable practical applications. However due to the poor controllability on nucleation locations and the intrinsic anisotropic nature of singlecrystals, growth of single-crystal patterns with homogeneous orientation is a big challenge especially by the vapor method. Herein a vapor growth protocol to achieve patterned organic semiconductor single-crystals with high crystallinity and uniform crystallographic orientation is presented. The protocol relies on the recently invented microspacing in-air sublimation a...

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Manipulate organic crystal morphology and charge transport

Cited by 28 publications

References 183 publications

Tailoring the charge transport characteristics in ordered small-molecule organic semiconductors by side-chain engineering and fluorine substitution

Tailoring the charge transport characteristics in ordered small-molecule organic semiconductors by side-chain engineering and fluorine substitution

Binary solvent engineering for small-molecular organic semiconductor crystallization

Homogeneously Oriented Organic Single‐Crystalline Patterns Grown by Microspacing In‐Air Sublimation

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