Multilevel Nonvolatile Flexible Organic Field‐Effect Transistor Memories Employing Polyimide Electrets with Different Charge‐Transfer Effects

Yu, An-Dih; Tung, Wei-Yao; Chiu, Yu‐Cheng; Chueh, Chu‐Chen; Liou, Guey‐Sheng; Chen, Wen‐Chang

doi:10.1002/marc.201400089

Cited by 37 publications

(34 citation statements)

References 28 publications

(30 reference statements)

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“…21,31,32 Until now, polyimide (PI)-type polymers have been widely developed as electret materials for use in memory devices owing to their thermostability, flexibility, and good insulating properties. The design of the polymer is crucial for the synthesis of photosensitive electret layers because the charge trapping and storage functions depend on the chemical properties of the layers.…”

Section: Introductionmentioning

confidence: 99%

“…The design of the polymer is crucial for the synthesis of photosensitive electret layers because the charge trapping and storage functions depend on the chemical properties of the layers. 32,33 Therefore, we synthesized a PI-type spiropyran compound, poly(3,5-benzoic acid hexafluoroisopropylidene diphthalimide) (6FDA-DBA-SP), whose structural formula is shown in Fig. 21,[31][32][33][34][35] In addition, donor-acceptor (D-A)-type PIs enabled obtaining excellent memory performances by modulating their components (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Light-responsive spiropyran based polymer thin films for use in organic field-effect transistor memories

et al. 2016

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Light-responsive spirotype compounds have been receiving attention as attractive smart materials because of their various potential applications in organic optoelectronic devices, based on organic field-effect transistors (OFETs). However, it still remains a challenge to apply the organic flash memory devices using spirotype compounds due to the relatively poor development of new photosensitive electret materials.Here, we report the synthesis of a novel photosensitive polymer electret material, spiropyran, containing poly(3,5-benzoic acid hexafluoroisopropylidene diphthalimide) (6FDA-DBA-SP), and the development of light-responsive flexible memory devices using the 6FDA-DBA-SP electret layer. The charge trapping properties of 6FDA-DBA-SP under light illumination were enhanced by the electron withdrawing properties and lowering energetic barrier of charge trapping between 6FDA-DBA-SP and pentacene analysed by measuring the electronic structures at the pentacene/6FDA-DBA-SP interfaces. The resulting OFETs showed enlarged hysteresis under white-light illumination and exhibited bi-stable current states after the light-assisted programing and erasing processes, and they were utilized in non-volatile flexible memory device applications. † Electronic supplementary information (ESI) available: Synthetic methods and analysis of 6FDA-DBA-SP; the 1 H-NMR spectrum, DSC curves, and TGA curves of 6FDA-DBA and 6FDA-DBA-SP; UV-Vis absorption spectra of SP-OH, 6FDA-DBA, and 6FDA-DBA-SP; electrical characteristics table of the SP-OFETs; transfer characteristics in the saturation regime of the SP-OFETs; transfer characteristics of the SP-OFETs during successive sweeps under different conditions (10 sweeps under dark conditions and 1 sweep under white-light); transfer characteristics of SP-OFETs as a function of applied bias time or voltage under dark conditions; transfer characteristics of SP-OFETs as a function of applied bias time under white-light illumination (sweeping from À40 V to 40 V); transfer characteristics of pentacene OFETs based on a polystyrene layer; comparative UPS spectra of pentacene and 6FDA-DBA-SP films in the dark or under white-light; (ahn) 2 versus hn plot of 6FDA-DBA-SP and pentacene films; current response to one-cycle switching behavior of SP-OFET memory devices; and transfer characteristics of the flexible SP-OFETs before and after bending in the dark. See

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light-responsive spiropyran based polymer thin films for use in organic field-effect transistor memories

et al. 2016

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“…For example, organic field‐effect‐transistor (OFET) memory with polymethacrylate electrets composed of pendant π‐conjugated moieties of fluorene, thiophene, or triphenylamine show a significantly hysteresis phenomenon in which the memory properties arise from the pendant conjugation length/strength and polymer architectures . Donor–acceptor polyimide electrets are also suitable candidates for bipolar charge‐storage layers because the field‐induced intramolecular charge transfer (ICT) behavior can trigger the charge‐trapping capability . However, the synthetic polymers used in memory devices are derived from petroleum, which limits their application due to increasing environmental awareness.…”

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confidence: 99%

Oligosaccharide Carbohydrate Dielectrics toward High‐Performance Non‐volatile Transistor Memory Devices

et al. 2015

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Oligosaccharides are one of the most promising biomaterials because they are abundant, renewable, diversified, and biosourced. The use of oligo- or polysaccharides for high-performance non-volatile organic field-effect-transistor memory is demonstrated herein. The charge-storage mechanism is attributed to charged hydroxyl groups that induce stronger hydrogen bonding, thus leading to the stabilization of trapped charges. This study reveals a promising future for green memory devices.

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“…For the OFET memory device, the time during which the stored charge is retained in the polymer electrets is defined as the retention time. The retention times achieved by the fabricated OFET memories with PI(6FOH-ODPA) blended with AM1-AM4 (15,25,35 and 100 %) as the electrets are exhibited in Figure 7a nd Figure S19-S21 in the Supporting Information. The retention capability of nonvolatile OFET memory devices was measured after the application of + +40 V( ON state) and À40 V( OFF state) gate pulses for 1s to investigatet he carrier stabilityi nt he studied electrets.…”

Section: Ofet Performance and Memory Characteristicsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] In particular, organic field effect transistor (OFET) typem emory exhibits the advantages of easy integration and nondestructive read-out. In such devices, atypical configurationi saconventional transistor with an additional charge storage layer (namely electret) between as emiconductor and ad ielectric layer.T he widely studied organic electrets for transistor memory devices include organic ferroelectric materials, [11][12][13][14][15] polymer composites and hybrids, [16][17][18][19][20][21][22][23][24][25][26] and polymer electrets (conjugated/nonconjugated and donor-acceptor system) [27][28][29][30][31][32][33][34][35][36] due to their effectiveness in creating hysteresis behavior and modulating high and low-conducting state using differentapplied gate-source bias.…”

Section: Introductionmentioning

confidence: 99%

High Performance Nonvolatile Transistor Memories Utilizing Functional Polyimide‐Based Supramolecular Electrets

Tung

et al. 2016

Chemistry An Asian Journal

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We report pentacene-based organic field-effect transistor memory devices utilizing supramolecular electrets, consisting of a polyimide, PI(6FOH-ODPA), containing hydroxyl groups for hydrogen bonding with amine functionalized aromatic rings (AM) of 1-aniline (AM1), 2-naphthylamine (AM2), 2-aminoanthracene (AM3), and 1-aminopyrene (AM4). The effect of the phenyl ring size and composition of AM1-AM4 on the hole-trapping capability of the fabricated devices was investigated systematically. Under an operating voltage under ±40 V, the prepared devices using the electrets of 100 % AM1-AM4/PI ratios exhibited a memory window of 0, 8.59, 25.97, and 29.95 V, respectively, suggesting that the hole-trapping capability increased with enhancing phenyl ring size. The memory window was enhanced as the amount of AM in PI increased. Furthermore, the devices showed a long charge-retention time of 10(4) s with an ON/OFF current ratio of around 10(3) -10(4) and multiple switching stability over 100 cycles. This study demonstrated that the electrical characteristics of the OFET memory devices could be manipulated through the chemical compositions of the supramolecular electrets.

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Multilevel Nonvolatile Flexible Organic Field‐Effect Transistor Memories Employing Polyimide Electrets with Different Charge‐Transfer Effects

Cited by 37 publications

References 28 publications

Light-responsive spiropyran based polymer thin films for use in organic field-effect transistor memories

Light-responsive spiropyran based polymer thin films for use in organic field-effect transistor memories

Oligosaccharide Carbohydrate Dielectrics toward High‐Performance Non‐volatile Transistor Memory Devices

High Performance Nonvolatile Transistor Memories Utilizing Functional Polyimide‐Based Supramolecular Electrets

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