A comparison of space-charge distributions in electron-beam irradiated FEP obtained by using heat-wave and pressure-pulse techniques

Bloss, P.; Steffen, M.; Schäfer, Hartmut; Yang, G.M.; Sessler, G. M.

doi:10.1088/0022-3727/30/11/016

Cited by 27 publications

(16 citation statements)

References 28 publications

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“…Thermal and pressure wave methods have been used complementarily in studies of polymer electrets [58][59][60] and PWP was used [61] to measure charge distribution under irradiation and near-vacuum conditions [62].…”

Section: Charge Detection Methods For Insulatorsmentioning

confidence: 99%

Detection of charge distributions in insulator surfaces

Rezende¹,

Gouveia²,

Silva³

et al. 2009

J. Phys.: Condens. Matter

100

106

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Charge distribution in insulators has received considerable attention but still poses great scientific challenges, largely due to a current lack of firm knowledge about the nature and speciation of charges. Recent studies using analytical microscopies have shown that insulators contain domains with excess fixed ions forming various kinds of potential distribution patterns, which are also imaged by potential mapping using scanning electric probe microscopy. Results from the authors' laboratory show that solid insulators are seldom electroneutral, as opposed to a widespread current assumption. Excess charges can derive from a host of charging mechanisms: excess local ion concentration, radiochemical and tribochemical reactions added to the partition of hydroxonium and hydronium ions derived from atmospheric water. The last factor has been largely overlooked in the literature, but recent experimental evidence suggests that it plays a decisive role in insulator charging. Progress along this line is expected to help solve problems related to unwanted electrostatic discharges, while creating new possibilities for energy storage and handling as well as new electrostatic devices.

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Section: Charge Detection Methods For Insulatorsmentioning

confidence: 99%

Detection of charge distributions in insulator surfaces

Rezende¹,

Gouveia²,

Silva³

et al. 2009

J. Phys.: Condens. Matter

100

106

View full text Add to dashboard Cite

show abstract

“…Since its development by Lang and Das‐Gupta6, 7 LIMM has been used successfully to study the depth profile of the polarization distribution in thin ferroelectric layers8 as well as space charges in electret films 9. 10 Depending on the material under study, the method uses the pyroelectric property of polar materials—the change in spontaneous polarization with temperature—or the spatially inhomogeneous distribution of space charges.…”

Section: Detecting Space Charge With Limmmentioning

confidence: 99%

Distribution of space charges in luminescent conjugated polymers

Feller

Geschke

Monkman

2002

Polymer International

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We present investigations of the distribution of space charges in thin films of conjugated polymers. A thermal wave method (LIMM) has been used to resolve the depth profile of space charges and the distribution of the internal electric field in 3–4 µm films of poly(2,5‐pyridinediyl), the poly(p‐phenylenvinylene) derivative poly[2‐methoxy,5‐(2′‐ethyl‐hexyloxy)‐1,4‐phenylenvinylene] (MEH‐PPV) and polyfluorine (PFO). The results demonstrate that in conjugated polymers, space charges cannot only be created but can also be stored permanently. The electric field in the bulk of the film is significantly reduced because of the existence of two space charge layers: a narrow, positively charged layer at the front electrode, and a broader, negatively charged layer at about 500 nm. We assign the positive layer to the injection of positive charge carriers from the anode into near surface traps, and the second hetero‐charge layer to bulk charges that have been separated within the external electric field and accumulated in the trapping zone. The dynamics of the accumulation and poling of the space charge layers has been investigated by means of measurements of the temporal evolution and temperature dependence of the pyroelectric response. © 2002 Society of Chemical Industry

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“…Since the development of the LIMM by Lang and Das-Gupta [10] it has been used successfully to study the depth profile of the polarization distribution in thin ferroelectric layers [11] as well as space charges in electret films [12,13]. Depending on the material under study, the method uses the pyroelectric property of polar materials-the change in spontaneous polarization with temperature-or the spatially inhomogeneous distribution of space charges.…”

Section: Limm Equationsmentioning

confidence: 99%

Spatial distribution and dynamics of space charges in poly(2, 5-pyridinediyl)

Feller¹,

Geschke

Monkman

2002

J. Phys.: Condens. Matter

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We present investigations of the spatial distribution of space charges in thin films of conjugated polymers. A thermal wave method, the laser intensity modulation method, has been used to resolve the depth profile of space charges and the distribution of the internal electric field in 3-4 µm films of poly(2, 5-pyridinediyl). The dynamics of the space-charge accumulation has been investigated by means of measurements of the temporal evolution and the temperature dependence of the pyroelectric response. The results demonstrate that in conjugated polymers, space charges of either sign can be stored permanently by deep trapping. This charge significantly reduces the internal electric field in the bulk of the films.

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A comparison of space-charge distributions in electron-beam irradiated FEP obtained by using heat-wave and pressure-pulse techniques

Cited by 27 publications

References 28 publications

Detection of charge distributions in insulator surfaces

Detection of charge distributions in insulator surfaces

Distribution of space charges in luminescent conjugated polymers

Spatial distribution and dynamics of space charges in poly(2, 5-pyridinediyl)

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