Noise and modulated photocurrents in amorphous semiconductors

Reynolds, S.; Main, C.; Rose, M. J.

doi:10.1016/s0022-3093(98)00061-1

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…2b). An analysis of noise in amorphous semiconductors [12] also leads to a same dependence of noise on L and d when adapted to our geometry. On the other hand, I ph -I dark is independent of L (if the fiber is longer than the illumination spot), and consequently s ∝ 1/ L p , i.e., the sensitivity drops as the fiber length increases.…”

mentioning

confidence: 62%

Multimaterial Photodetecting Fibers: a Geometric and Structural Study

et al. 2007

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The recent development of codrawn metal-insulator-semiconductor photodetecting fiber devices with mesoscopic-scale cross-sectional features has heralded a novel path to optical radiation detection. [1][2][3][4][5][6][7][8] For the first time, optical detection function may be delivered at length scales and in a mechanically flexible form hitherto associated with optical fibers. At the heart of the fabrication process is the simultaneous reduction of the cross-section and extension of the axial dimensions of a macroscopic prefrom. Thermal drawing results in extended length scales of functional fiber while maintaining the material composition and transverse geometry throughout. Although beneficial for many applications, [1,2,5,6] the extended length scales of fiber-devices tend to degrade their performance by raising the noise floor. Our study aims to minimize the noise per unit length by identifying optimal fiber structures and geometries. A comparative study of the responsivity, noise and sensitivity [9,10] of photodetecting fibers as a function of structural and geometric scaling parameters is performed. A novel thin-film photodetecting fiber device architecture is introduced. Precise control over the submicron scale dimensions affords more than an order of magnitude increase in the fiber-device sensitivity. Potential applications of fiber devices include remote sensing, functional fabrics, and largearea, two-dimensional (2D) and three-dimensional (3D) arrays (or "fiber webs") capable of optical imaging. [1,5,6]

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confidence: 62%

Multimaterial Photodetecting Fibers: a Geometric and Structural Study

et al. 2007

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“…In addition an RC circuit mimicking the inner part of the semiconducting particle and some additional resistors mimicking resistances of the ITO electrode and the electrolyte are necessary for accurate modeling of the photoelectrode. The energy barrier of the Schottky junction can be characterized by its resistance and capacitance; the most convenient equivalent electric circuit of every junction contributing to the electrode is a simple RC loop circuit. − Also the semiconducting particle can be described as an RC loop. ,,− There are, however, more complex equivalent circuits, ,,− but a simple RC circuit reproduces the behavior of the photoelectrode sufficiently well. The simplified electric equivalent of the semiconducting photoelectrode in the studied system is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…[64][65][66][67][68][69][70][71][72][73][74] Also the semiconducting particle can be described as an RC loop. 51,52,[75][76][77] There are, however, more complex equivalent circuits, 67,74,[78][79][80][81][82][83][84][85][86][87][88] but a simple RC circuit reproduces the behavior of the photoelectrode sufficiently well. The simplified electric equivalent of the semiconducting photoelectrode in the studied system is shown in Figure 11.…”

Section: 1mentioning

confidence: 99%

Optoelectronic Switches Based on Wide Band Gap Semiconductors

et al. 2006

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Switching of photocurrent direction in semiconducting systems upon changes of the electrode potential or incident light wavelength was realized by a series of photoelectrodes covered with titania modified with pentacyanoferrate complexes, [Fe(CN)(5)L](n)(-) (L = NH(3), thiodiethanol, thiodipropanol). These materials were characterized by optical spectroscopy and electrochemistry. The structure of the surface complexes was modeled using simple quantum-chemical models. The electrodes described in this paper enable control of the photocurrent direction by two stimuli: Changing the wavelength or the photoelectrode potential easily switches the direction of photocurrent. The materials are different from those of similar characteristics studied by other authors: They are not composites comprising of two types of semiconductors but rather engineered uniform materials. The photocurrent switching phenomenon is an intrinsic feature resulting from a specific electronic structure of the surface-modified semiconductor.

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Photoconductivity: Fundamental Concepts

Kasap

2022

Photoconductivity and Photoconductive Materials

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Noise and modulated photocurrents in amorphous semiconductors

Cited by 8 publications

References 6 publications

Multimaterial Photodetecting Fibers: a Geometric and Structural Study

Multimaterial Photodetecting Fibers: a Geometric and Structural Study

Optoelectronic Switches Based on Wide Band Gap Semiconductors

Photoconductivity: Fundamental Concepts

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