Phthalocyanine-Based Organic Thin-Film Transistors: A Review of Recent Advances

Melville, Owen A.; Lessard, Benoît H.; Bender, Timothy P.

doi:10.1021/acsami.5b01718

Cited by 321 publications

(241 citation statements)

References 100 publications

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“…Phthalocyanines (Pcs) and their metal complexes (MPcs) offer many opportunities for creating novel applications including organic solar cells, organic semiconductors, catalysis, and drugs for photodynamic therapy due to their intense absorption band in the far‐red/near‐IR wavelength regions (the commonly named Q‐band) . The systematically control of their Q‐band wavelengths and energies of the lowest exited states levels has been a critically important issue for enhancing performance in these applications.…”

Section: Introductionmentioning

confidence: 99%

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

Yamamoto

Kuribayashi

Murakami

et al. 2017

Chemistry A European J

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Three regioregular phthalocyanines (1-3) were synthesized selectively by the cyclic tetramerization of phthalonitriles bearing a bulky diarylamine substituent at the next position of nitrile. The steric repulsion at the tetramerization of bulky phthalonitriles allowed for the selective formation of regioregular phthalocyanines as confirmed by NMR and single crystal X-ray structural analyses. The absorption spectrum of 1 substituted with di(4-tert-butylphenyl)amine groups at the non-peripheral positions showed a non-split Q-band at 764 nm, which was redshifted by 83 nm compared with that of metal free phthalocyanine (H Pc). The TD-DFT calculation and electrochemical studies prove that the substitution of diarylamine groups at the α-positions effectively destabilizes the HOMO energy level, which causes a large redshift of the Q-band. Moreover, 1 can generate a one-electron oxidation species through chemical oxidation. The Q-band position of 2 bearing 4,4'-dimetoxyphenylamine units was further shifted by 10 nm compared with that of 1. In addition, 3 having carbazole units showed a small redshift of the Q-band relative to H Pc. The hole-mobility of 2 in thin film was determined to be 1.1×10 cm V s by using a space charge limited current method. A perovskite solar cell employing 2 as a hole-transporting layer gave an efficiency of 5.1 % under standard global 100 Wcm AM 1.5 G illumination.

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Section: Introductionmentioning

confidence: 99%

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

Yamamoto

Kuribayashi

Murakami

et al. 2017

Chemistry A European J

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“…60 nm thick Au contacts were thermally evaporated through shadow masks. The last step consisted in the evaporation of TTC, a long alkane chain molecule generally used as gate dielectric27 and employed in this work as a thin encapsulation layer for air stability measurements.…”

Section: Architecture Of the Sensormentioning

confidence: 99%

Piezoelectric polymer gated OFET: Cutting-edge electro-mechanical transducer for organic MEMS-based sensors

Thuau

Abbas

Wantz

et al. 2016

Sci Rep

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The growth of micro electro-mechanical system (MEMS) based sensors on the electronic market is forecast to be invigorated soon by the development of a new branch of MEMS-based sensors made of organic materials. Organic MEMS have the potential to revolutionize sensor products due to their light weight, low-cost and mechanical flexibility. However, their sensitivity and stability in comparison to inorganic MEMS-based sensors have been the major concerns. In the present work, an organic MEMS sensor with a cutting-edge electro-mechanical transducer based on an active organic field effect transistor (OFET) has been demonstrated. Using poly(vinylidenefluoride/trifluoroethylene) (P(VDF-TrFE)) piezoelectric polymer as active gate dielectric in the transistor mounted on a polymeric micro-cantilever, unique electro-mechanical properties were observed. Such an advanced scheme enables highly efficient integrated electro-mechanical transduction for physical and chemical sensing applications. Record relative sensitivity over 600 in the low strain regime (<0.3%) was demonstrated, which represents a key-step for the development of highly sensitive all organic MEMS-based sensors.

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“…The analysis of Raman peak shape and positioning reiealed impact of samples' morphological order/disorder. Up to now, Raman spectroscopy as fast, non-destructiie and cost-effectiie diagnostic method 22 ]. At present, the detailed analysis of Raman peaks suggested ability of this technique to fingerprint phthalocyanine surface homogeneity and its inclination for degradation processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of order and disorder on degradation processes of copper phthalocyanine nanolayers

et al. 2017

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The impact was examined of surface ordering of 50 nm-thick copper phthalocyanine (CuPc) layers on the layer's susceptibility to ambience-induced degradation processes. The surface morphology of CuPc layers obtained by physical iapor deposition with different deposition rates, 0.01 nm/s (r 1 ) and 0.02 nm/s (r 2 ), was diagnosed applying atomic force and scanning electron microscopes. The images exhibited compact, ordered surface topography with crystallites of homogeneous geometry for a layer with r 1 while randomly distributed bigger crystallites on a rougher and more expanded surface for a layer with r 2 . X-ray diffraction reiealed the α-form of phthalocyanine, mostly with an orientation of the a axis perpendicular to the substrate plane. Mean grain size in bulk was slightly larger for CuPc with r 2 . . Energy dispersiie X-ray spectroscopy demonstrated an increase of C/Cu and N/Cu elemental ratios compared to the expected composition for both layers but significantly more pronounced for layer with r 2 . Morphological features and traces of CuPc-air interaction were mirrored also in the Raman spectra. Samples with r 2 exhibited an increased peak width, and their peaks were shifted compared to samples with r 1 , which was attributed to surface disorder. The Raman spectra exhibited the appearance of additional peaks of oxidation products indicating C-O-C, C=O and N-O bonds, with intensities coinciding to an increased carbon and nitrogen content. More intensiie peaks were recorded for layers obtained with higher deposition rate, proiing their stronger susceptibility to eniironment-induced degradation processes.

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Phthalocyanine-Based Organic Thin-Film Transistors: A Review of Recent Advances

Cited by 321 publications

References 100 publications

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

Regioregular Phthalocyanines Substituted with Bulky Donors at Non‐Peripheral Positions

Piezoelectric polymer gated OFET: Cutting-edge electro-mechanical transducer for organic MEMS-based sensors

Effect of order and disorder on degradation processes of copper phthalocyanine nanolayers

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