The Sensitivity and Response Time of Lead Sulphide Photoconductive Cells
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Abstract:
Measurements of the response time and photosensitivity of lead sulphide photoconductive cells have been made with a view to establishing a theoretical working model for photoconductors of this type The measurements include the variation in response time and photosensitivity with temperature, background illumination, applied electric field and other parameters. The results support, at least qualitatively, a theory of photoconductivity which postulates the existence of space-charge barriers at intercrystalline contacts The height of such barriers is reduced on illumination and conduction facilitated.Keywords:
Photoconductivity
Photosensitivity
Response time
Lead (geology)
The design of photosensitivity measuring instrument was analyzed in the paper.The photosensitivity of solar cells prepared from blend systems of polythiophene(P3HT(poly(3-hexyl thiophene)) and C60 derivative PCBM(-phenyl C61-butyric acid methyl ester) was measured with self-made photosensitivity measuring instrument,and the reasons for the changes in the photosensitivity of solar cells were analyzed.
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Photoconductivity
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Abstract The photosensitivity in cis ‐polyphenylacetylene ( cis ‐PPA, polymerized with rare‐earth catalysts) can be significantly enhanced by doping the PPA with I 2 or FeCl 3 and sensitizing with 4‐isothiocyanatofluorescein (F‐II) or 2,4,7‐trinitro‐9‐fluorenone (TNF), which are powerful sensitizers. The electrophotographic photoreceptor (P/R) device with cis ‐PPA + F‐II (on Al substrate) appeared preferable in photosensitivity enhancement and showed good photosensitivity: dark decay 1,8 V/s; maximum rate of discharge 321 V/s; residual surface potential 22 V; discharge 89, 1%; photosensitivity 2,96 s −1 . This is a new “family” of photosensitive materials which can be used in a duplicator.
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Abstract Several polyvinylesters of substituted cinnamylideneacetic acids were synthesized and their photosensitivities were investigated. It was found that polyvinylesters of planar acids reacted photochemically effectively and were spectrally sensitized by usual triplet sensitizer. On the other hand, polyvinylesters of twisted acids exhibited poor photosensitive properties. Poly(vinyl α‐cyanocinnamylideneacetate) (PV‐V) was found to be an excellent photosensitive polymer with respect to both photosensitivity and thermal stability (or storage stability).
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Space charge in the ethylene-vinyl acetate (EVA) copolymer was directly probed by a thermal-pulse-current (TPC) technique. The mechanism of electrical conduction is discussed by using the results of TPC and conduction measurements. The conduction is explained as follows. In the low-field region, positive-carrier injection dominates the conduction. Positive homo space charge due to the injected carriers is formed and controls the conduction as in the case of space-charge-limited current. The conduction is explained quantitatively by the space-charge-perturbed current theory in which the anode field is not reduced to zero. In the high-field region, the carrier injection rate cannot cope with the sweepout of injected carriers and the conduction is injection-limited.
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Measurements of the response time and photosensitivity of lead sulphide photoconductive cells have been made with a view to establishing a theoretical working model for photoconductors of this type The measurements include the variation in response time and photosensitivity with temperature, background illumination, applied electric field and other parameters. The results support, at least qualitatively, a theory of photoconductivity which postulates the existence of space-charge barriers at intercrystalline contacts The height of such barriers is reduced on illumination and conduction facilitated.
Photoconductivity
Photosensitivity
Response time
Lead (geology)
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The UV photosensitivity of GeO2-doped fibers and waveguides can be increased by loading with H2 at high pressure,1,2 but to date, H2-loaded P2O5-doped glass has not shown photosensitivity at 248 nm.1,3 Heating a glass causes a shift of the UV edge to longer wavelengths,4 increasing the photon-glass interactions. In this work we show that heating (200-450°C) increases the UV photosensitivity of H2-loaded GeO2-doped fibers and brings on 248-nm photosensitivity in H2-loaded P2O5-doped fibers.
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Ultraviolet
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Photoconductivity
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Phenomenological model
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A relative photosensitivity factor S equal to 1430 is observed due to incorporation of Y in CdS. Dye-treatment enhances this value to 4516. A charge-transfer mechanism may be considered to be responsible for this process. Superliner photoconductivity and thermal quenching observed in the temperature range 133-366 K are explained in terms of a two-centre model.
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Photosensitivity
Atmospheric temperature range
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