A simple organic diode structure with strong rectifying characteristics

He, Shou-Jie; White, Robin; Wang, D.K.; Zhang, J.; Jiang, Nan; Lü, Zheng

doi:10.1016/j.orgel.2014.09.018

Cited by 14 publications

(11 citation statements)

References 23 publications

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“…In our system, a 50 nm C 60 :PbPc hybrid film is utilized as NIR photosensitive layer, and 15 nm BCP functions as an electron transport layer in as‐fabricated organic photodetectors. Figure c shows the energy level diagram of the different materials used in experimental devices indicating that there is an energy offset at the PbPc donor to C 60 acceptor, which allows for efficient charge separation . Figure d shows the absorption spectra of C 60 , PbPc and C 60 :PbPc films.…”

Section: Resultsmentioning

confidence: 99%

Insight into trap state dynamics for exploiting current multiplication in organic photodetectors

Luo

et al. 2016

Physica Rapid Research Ltrs

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Trap‐induced current multiplication has received tremendous attention in organic photodetectors because it is not required for a pre‐amplifier circuit to read weak photocurrent signals. However, a plausible correlation between energy‐distin‐guishable trap states and device performance has not been established for guiding the device design, a task that remains a significant challenge. Here, we propose an ingenious strategy to demonstrate current multiplication by engineering an ultrathin fullerene (C60) film as hole trap or barrier layer, which illustrates trap‐state dynamics through systematical investigations on device current fluctuations in darkness and illumination conditions. The comparison of trap‐dependent performances between experimental and control devices clearly shows that the traps play a critical role in generating the multiplication effect. And shallow trap states are estimated to be more favorable for improving the device restorability. Thus, we anticipate that trap engineering, by selectively passivating deep traps whilst retaining shallow ones, will be a fruitful approach for further research, leading to high‐performance photodetectors with superior current multiplication and temporal response. (© 2013 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 99%

Insight into trap state dynamics for exploiting current multiplication in organic photodetectors

Luo

et al. 2016

Physica Rapid Research Ltrs

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“…Indeed, an extremely high nonradiative recombination of CT excitons has been demonstrated for NPB∕C 60 heterojunction recently. 40 As shown in Fig. 5(a), a unique energy level alignment and a large energy barrier lead to electrons and holes accumulation at NPB∕C 60 interface and form CT excitons, which recombine nonradiatively by phonon emission at a very fast rate.…”

Section: Phonon Emissionmentioning

confidence: 99%

“…[17][18][19][20][21] This process is referred to as Auger recombination. Auger recombination is a common electronic process in inorganic semiconductors 40 and quantum dots, in particular when the carrier concentration is high. 41,42 In organic semiconductors, Auger recombination may involve bimolecular recombination, which CT excitons recombine at the heterojunction interface by transferring their energy to excite adjacent electrons to higher energy levels.…”

Section: Auger Recombinationmentioning

confidence: 99%

Ultralow-voltage Auger-electron-stimulated organic light-emitting diodes

2016

J. Photon. Energy

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Abstract. Organic light-emitting diodes (OLEDs) have numerous applications ranging from flat-panel displays to eco-friendly solid-state lightings. OLEDs typically operate under high bias voltages at, or above, the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy gaps of the light-emitting molecules. We review recent development in Auger-electron-stimulated OLEDs, which have working voltages below the HOMO-LUMO energy gaps of emitters; i.e., the output photon energies are higher than the input electrical energies.

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“…20,21 For example, Liu and co-workers reported a photodetector by integrating AuNPs plasmonic structure with grapheme, thereby achieving greatly enhanced photocurrent and external quantum efficiency up to 1500%. 29 Besides, the most significant consideration is that both materials nearly have no photoabsorption from 600 to 900 nm wavelength range, which can be approximatively regarded as a configuration without any influences on Red-NIR resonant absorption of AuNPs. 22 As for photo detection, the most impressive advantage of AuNP could be its tunable absorption ability 13 for incident light over a broad wavelength range owing to its nanoscale island or layer size.…”

Section: Introductionmentioning

confidence: 99%

Remarkably enhanced red–NIR broad spectral absorption via gold nanoparticles: applications for organic photosensitive diodes

Luo

Wen

et al. 2015

Nanoscale

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For organic films, remarkably enhanced red-NIR broad spectral absorption was achieved via the incorporation of gold nanoparticles (AuNPs) using a simple and facile preparation. The relevant thermal evaporation method has produced size-controllable AuNPs in the range of 0-20 nm diameter. The potential use of localized surface plasmon resonance (LSPR) enhanced organic photosensitive diodes (OPDs) as sensitive broadband sensors was discussed in this context. Here we showed that, by combining organic heterojunctions with size-controllable plasmonic AuNPs, the efficiency of organic photodetectors could be increased by up to one order of magnitude, because of LSPR and scattering effects of the AuNPs. Fabricated OPD devices showed a large photoresponse under radiation from wavelengths between 650 and 830 nm, accompanied by a low power consumption profile. A schematic energy level model combined with theoretical simulation analysis was proposed to explain the experimental data. More importantly, to the best of our knowledge, this work demonstrated the broadest photosensitivity with high responsivity from AuNP-based photodetectors, proving the potential of AuNPs as a promising material for efficient optoelectronic devices.

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A simple organic diode structure with strong rectifying characteristics

Cited by 14 publications

References 23 publications

Insight into trap state dynamics for exploiting current multiplication in organic photodetectors

Insight into trap state dynamics for exploiting current multiplication in organic photodetectors

Ultralow-voltage Auger-electron-stimulated organic light-emitting diodes

Remarkably enhanced red–NIR broad spectral absorption via gold nanoparticles: applications for organic photosensitive diodes

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