Optoelectronic devices based on evaporated pentacene films

Voz, C.; Puigdollers, J.; Martı́n, I.; Muñoz, D.; Orpella, A.; Vetter, Michael; Alcubilla, R.

doi:10.1016/j.solmat.2004.07.039

Cited by 33 publications

(23 citation statements)

References 11 publications

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“…This indicates the formation of a Schottky barrier at the pentacene/ Al interface (Voz et al, 2005), thus confirming the successful fabrication of the device. The inset in Figure 2A shows a log-log plot of the J-V characteristic over the forward-bias range, with the horizontal dashed line corresponding to the current density of 1.6 µA cm −2 that was employed for the EDMR measurements.…”

Section: Methodssupporting

confidence: 65%

Angular-Dependent EDMR Linewidth for Spin-Dependent Space-Charge-Limited Conduction in a Polycrystalline Pentacene

Fukuda

Asakawa

2017

Front. Mater.

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Spin-dependent space-charge-limited carrier conduction in a Schottky barrier diode using polycrystalline p-type π-conjugated molecular pentacene is explored using multiple-frequency electrically detected magnetic resonance (EDMR) spectroscopy with a variable-angle configuration. The measured EDMR spectra are decomposed into two components derived, respectively, from mobile and trapped positive polarons. The linewidth of the EDMR signal for the trapped polarons increases with increasing resonance magnetic field for an in-plane configuration where the normal vector of the device substrate is perpendicular to the resonance magnetic field, while it is independent of the field for an out-of-plane configuration. This difference is consistent with the pentacene arrangement on the device substrate, where pentacene molecules exhibit a uniaxial orientation on the out-of-substrate plane. By contrast, the mobile polarons do not show anisotropic behavior with respect to the resonance magnetic field, indicating that the anisotropic effect is averaged out owing to carrier motion. These results suggest that the orientational arrangements of polycrystalline pentacene molecules in a nano thin film play a crucial role in spin-dependent electrical conduction.

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Section: Methodssupporting

confidence: 65%

Angular-Dependent EDMR Linewidth for Spin-Dependent Space-Charge-Limited Conduction in a Polycrystalline Pentacene

Fukuda

Asakawa

2017

Front. Mater.

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“…These excitons should be dissociated into charge carriers (polarons) in order to contribute to the photocurrent. Several studies indicate that excitons are dissociated only within narrow photoactive regions close to the electrodes [20][21][22]. Therefore, mainly excitons dissociated at the electrode which offers the shortest distance for the less mobile carrier (holes in C 60 ) contribute to the photocurrent.…”

Section: Resultsmentioning

confidence: 99%

Photodiodes based on fullerene semiconductor

et al. 2007

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“…Equation (6) indicates that the main contribution to the Y signal essentially comes from the so-called probed trap density, DðE x Þ, at E x which is essentially near the maximum of the m(E).…”

Section: Background Of the Mpc Spectroscopymentioning

confidence: 99%

“…[1][2][3] Organic thin films have been incorporated as the semiconductor transport layer in different electronic and photonic devices providing a high performance appropriate for many potential applications. [4][5][6] Considerable efforts have been devoted to understand the factors that limit the transport of the charge carriers which is fundamental for the device mechanism of operation. Among the most important factors that govern the charge transport is the presence of electronic trap states or localized states in the energy gap.…”

Section: Introductionmentioning

confidence: 99%

Density and mobility effects of the majority carriers in organic semiconductors under light excitation

Vagenas

Giannopoulou

Kounavis

2015

Journal of Applied Physics

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This study demonstrates that the effect of light excitation on the density and the mobility of the majority carriers can be explored in organic semiconductors by modulated photocurrent spectroscopy. The spectra of phase and amplitude of the modulated photocurrent of pentacene films indicate a significant increase in the density of the photogenerated mobile holes (majority carriers). This increase is accompanied by a comparatively much smaller increase of the steady state photocurrent response which can be reconciled with a decrease in the mobility (μ) of holes. The decrease of μ is supported from an unusual increase of the Y/μ ratio of the out-of-phase modulated photocurrent (Y) signal to the mobility under light excitation. It is proposed that the mobile holes, which are generated from the dissociation of the light-created excitons more likely near the pentacene-substrate interface by electron trapping, populate grain boundaries charging them and producing a downward band bending. As a result, potential energy barriers are build up which limit the transport of holes interacting through trapping-detrapping with deep partially occupied traps in the charged grain boundaries. On the other hand, the transport of holes interacting through trapping-detrapping with empty traps is found unaffected.

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Optoelectronic devices based on evaporated pentacene films

Cited by 33 publications

References 11 publications

Angular-Dependent EDMR Linewidth for Spin-Dependent Space-Charge-Limited Conduction in a Polycrystalline Pentacene

Angular-Dependent EDMR Linewidth for Spin-Dependent Space-Charge-Limited Conduction in a Polycrystalline Pentacene

Photodiodes based on fullerene semiconductor

Density and mobility effects of the majority carriers in organic semiconductors under light excitation

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