Photoconductivity thesis


photoconductivity thesis

conductivity of semiconductors ( semiconductor ) and insulators ( insulator ) when they are exposed to light of sufficient energy. Read more, university dissertation from Uppsala : Acta Universitatis Upsaliensis. Most semiconductor materials have this property. Vidicon type targets made from silver sulfide layers were also investigated and showed an image fade-out effect with a time constant in the order of seconds. Target resolution was found to exceed 10 1p/mm and the targets responded to incident photon flux levels of 30 W/cm2. The dark current of single element sensors was investigated as a function of temperature and photocurrent was measured as a function of photon flux and wavelength. Photoconductive materials form the basis of light-controlled electrical switches, certain television cameras, copying machines that use electrophotographic reproduction, infrared radiation detectors, and other devices. Photoconductivity is the tendency of a substance to conduct electricity to an extent that depends on the intensity of light-radiant energy (usually infrared transmission or visible light) striking the surface of a sample. Abstract : This thesis presents the discovery of defect induced room-temperature ferromagnetism in industrially important ZnO and MgO thin films, and establishes from a systematic study, in both ZnO and MgO films, the unique phenomenon of the sequences of transitions from ferromagnetism to para-, and eventually the well known. Abstract : This thesis presents a comprehensive study of the intrinsic room temperature ferromagnetism in 85 to 100nm thin films produced by in situ deposition of industrially important pristine MgO and ZnO by inkjet printing.

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foh'toh kon'duk tiv"i tee. Typical photoconductive substances consist of germanium, gallium, selenium, or silicon with impurities, also known as dopants, added. In most cases, the greater the radiant energy of a specific wavelength that strikes the surface, the higher the conductance of the sample becomes, up to a certain maximum. Certain crystalline semiconductors, such as silicon, germanium, lead sulfide, and cadmium sulfide, are strongly photoconductive. Highly oriented and high quality dense thin films of ZnO and MgO have been deposited by reactive (balanced) magnetron sputtering under different ambience conditions and deposition temperatures. If the light is removed, the freed electrons return to their bound state and the current flow decreases. Abstract : The perovskite solar cell (PSC) is a recent contender within the photovoltaic research field. The increase in the electrical conductivity of a substance, often nonmetallic, caused by the absorption of electromagnetic radiation.

Abstract : This thesis presents the discovery of defect induced room-temperature ferromagnetism in industrially important.
This thesis reports the results of photoconductivity experiments on films of the conjugated polymers poly(2-methoxy-5- vinylene) (MEH-PPV poly(2,5-pyridinediyl) (PPY).
Picosecond photoconductivity of semi-insulating gallium arsenide.
The second part of the thesis describes the development and applications of the opto-electronic semiconductor switch.

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