Trap distribution for charge carriers in poly(paraphenylene vinylene) (PPV) and its substituted derivative DPOP-PPV

Meyer, Harald; Haarer, D.; Naarmann, H.; Hörhold, H.‐H.

doi:10.1103/physrevb.52.2587

Cited by 149 publications

(70 citation statements)

References 39 publications

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“…Especially for electron transport this proves to be problematic. Photocurrent transients of electrons in conjugated polymers reveal a featureless decay without a discernible transit time, 2,4 and electron mobilities derived from TOF…”

Section: ͑2͒mentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

Martens¹,

Huiberts²,

Blom³

2000

Applied Physics Letters

191

121

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The transport properties of electrons and holes in a poly(p-phenylene vinylene)-based polymer light-emitting diode (PLED) have been investigated. Using admittance spectroscopy, we are able to simultaneously obtain the electron and hole mobility, μ=μ0 exp(γE), in a single PLED. The dynamics of the electron and hole transport are separated in the frequency domain as a result of the different transit times. At room temperature, we find μ0=5.6×10−11 m2/V s and γ=5.0×10−4 (m/V)1/2 for holes. For electrons μ0=1.0×10−12 m2/V s and γ=8.0×10−4 (m/V)1/2 are obtained.

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Section: ͑2͒mentioning

confidence: 99%

“…Transient studies of hole transport in conjugated polymers [2][3][4][5] have established that the hole mobility is well described by…”

mentioning

confidence: 99%

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

Martens¹,

Huiberts²,

Blom³

2000

Applied Physics Letters

191

121

View full text Add to dashboard Cite

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“…This form for the mobility has been seen in time of flight measurements on conjugated organic materials, and has been derived theoretically. [13][14][15][16][17][18][19] It has been directly seen in time of flight measurements of MEH-PPV. 20 The device fabrication has been described previously.…”

Section: Introductionmentioning

confidence: 99%

Device physics of single layer organic light-emitting diodes

Crone

Campbell

Davids

et al. 1999

Journal of Applied Physics

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We present experimental and device model results for electron only, hole only, and bipolar organic light-emitting diodes fabricated using a soluble poly ͑p-phenylene vinylene͒ based polymer. Current-voltage (I -V) characteristics were measured for a series of electron only devices in which the polymer thickness was varied. The I -V curves were described using a device model from which the electron mobility parameters were extracted. Similarly, the hole mobility parameters were extracted using a device model description of I -V characteristics for a series of hole only devices where the barrier to hole injection was varied by appropriate choices of hole injecting electrode. The electron and hole mobilities extracted from the single carrier devices are then used, without additional adjustable parameters, to describe the measured current-voltage characteristics of a series of bipolar devices where both the device thickness and contacts were varied. The model successfully describes the I -V characteristics of single carrier and bipolar devices as a function of polymer thickness and for structures that are contact limited, space charge limited, and for cases in between. We find qualitative agreement between the device model and measured external luminance for a thickness series of devices. We investigate the sensitivity of the device model calculations to the magnitude of the bimolecular recombination rate prefactor.

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“…Electronic defects such as traps strongly influence, or even dominate, both the optical and charge transport properties of organic 4 and inorganic devices. 5 Charges trapped at these defects are missing as mobile carriers, 6 change the space charge of the defect-rich region, can quench the emissive singlet excitons ͑SEs͒, 7 and can reabsorb the emission. The latter two processes can introduce sufficient optical loss in a LD to prevent laser operation.…”

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confidence: 99%

“…This letter describes a combined charge transport and optical study of electronic defects in paraphenylenes, which due to their defined chemistry, have very low defect contents if compared to poly͑phenylenevinylene͒-based materials. 6 The TSC depends on charge transport and, therefore, on many device parameters such as bulk carrier concentration and mobility, interface properties, etc. In contrast, photoluminescence ͑PL͒ -detected magnetic resonance ͑PLDMR͒ is a purely optical tool.…”

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confidence: 99%

Charged defects in highly emissive organic wide-band-gap semiconductors

List

Kim

Shinar

et al. 2000

Applied Physics Letters

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A combined photoluminescence (PL) -detected magnetic-resonance (PLDMR) and thermally stimulated current (TSC) study of defects in wide-band-gap para-phenylene-type semiconductors is described. As TSC probes the density of mobile charge carriers after detrapping and PLDMR reveals the influence of trapped charges on the PL, their combination yields the concentration of traps, their energetic position, and their contribution to PL quenching. The reported trap densities, which are 2×1016 for the polymer and 1×1014 cm−3, for the oligomer, are the lowest reported for para-phenylene-type materials.

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Trap distribution for charge carriers in poly(paraphenylene vinylene) (PPV) and its substituted derivative DPOP-PPV

Cited by 149 publications

References 39 publications

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

Simultaneous measurement of electron and hole mobilities in polymer light-emitting diodes

Device physics of single layer organic light-emitting diodes

Charged defects in highly emissive organic wide-band-gap semiconductors

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