Competition between Charge-Transfer Exciton Dissociation and Direct Photocarrier Generation in Molecular Donor-Acceptor Compounds

Tsutsumi, Jun; Yamada, Toshikazu; Matsui, Hiroyuki; Haas, Simon; Hasegawa, Tatsuo

doi:10.1103/physrevlett.105.226601

Cited by 40 publications

(43 citation statements)

References 26 publications

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“…Here y 0 is the background which can be considered as a third extended living state, decaying at least on a millisecond time range. Such relaxation dynamics have also been observed in other photo-response experiments on organic conductors [48][49][50][51] taking place between the microsecond regime and far above the millisecond time scale. However, the most important phenomena are the interference patterns which are superimposed on top of the exponentially decaying current signal.…”

Section: Response To Laser Pulsessupporting

confidence: 52%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim¹,

Dressel²

2017

Preprint

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Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

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Section: Response To Laser Pulsessupporting

confidence: 52%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim¹,

Dressel²

2017

Preprint

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show abstract

“…Here y 0 is the background which can be considered as a third extended living state, decaying at least on a millisecond time range. Such relaxation dynamics have also been observed in other photo-response experiments on organic conductors [62][63][64][65] taking place between the microsecond regime and far above the millisecond time scale.…”

Section: Response To Laser Pulsessupporting

confidence: 72%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim

Dressel

2017

Crystals

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Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. We suggest that photo-induced fluctuations of the charge-ordered state alter the current flow of the single particles and hence, the photocurrent. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

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“…[4][5][6] Such unique characteristics are promising for providing functional organic electronics or optoelectronic devices, although studies on device applications have been limited, so far, to those for prototypical single-crystal devices. [6][7][8][9][10] Because semiconducting CT compounds have a high tendency to form needle crystals along the donor-acceptor molecular stacks, manufacturing high quality thin films on substrate surfaces is difficult. For example, polycrystals obtained using vacuum deposition or solution cast techniques usually have large boundary potentials or discontinuity between microcrystal grains.…”

mentioning

confidence: 99%

Uniaxially oriented polycrystalline thin films and air-stable n-type transistors based on donor-acceptor semiconductor (diC8BTBT)(FnTCNQ) [n = 0, 2, 4]

Shibata

Tsutsumi

Matsuoka

et al. 2015

Applied Physics Letters

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We report the fabrication of high quality thin films for semiconducting organic donor-acceptor charge-transfer (CT) compounds, (diC8BTBT)(FnTCNQ) (diC8BTBT = 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene and FnTCNQ [n = 0,2,4] = fluorinated derivatives of 7,7,8,8,-tetracyanoquinodimethane), which have a high degree of layered crystallinity. Single-phase and uniaxially oriented polycrystalline thin films of the compounds were obtained by co-evaporation of the component donor and acceptor molecules. Organic thin-film transistors (OTFTs) fabricated with the compound films exhibited n-type field-effect characteristics, showing a mobility of 6.9 × 10−2 cm2/V s, an on/off ratio of 106, a sub-threshold swing of 0.8 V/dec, and an excellent stability in air. We discuss the suitability of strong intermolecular donor–acceptor interaction and the narrow CT gap nature in compounds for stable n-type OTFT operation.

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Competition between Charge-Transfer Exciton Dissociation and Direct Photocarrier Generation in Molecular Donor-Acceptor Compounds

Cited by 40 publications

References 26 publications

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Uniaxially oriented polycrystalline thin films and air-stable n-type transistors based on donor-acceptor semiconductor (diC8BTBT)(FnTCNQ) [n = 0, 2, 4]

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