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Languages : en
Pages :
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After a brief review of the work done during the first three quarters, the work done during the last quarter is discussed in detail. In brief, CdTe sputtered self-doped and indium-doped n-type layers on Ni-film on glass have been investigated for film resistivity, contact resistance, Hall mobility and Schottky barrier diode characteristics. Ni has been found to provide satisfactory ohmic contacts and self-doped samples have indicated Hall mobility of approximately 8cm2/Vsec when the effective doping concentration is approximately 1018cm−3. Use of indium doped sputtered films, when properly surface treated prior to metallization, appear to yield the best kind of Schottky barrier diode with approximate barrier height of 0.77 volt and Richardson constant A* approx. = 60 A/cm2°K2. In spite of these attractive parameter values, these devices showed low V/sub oc/ and the capacitance showed unexpected frequency dependence that require further investigation. Finally suggestions for future work is presented.
Author: K. Vedam
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Category :
Languages : en
Pages : 36
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Author:
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Languages : en
Pages :
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The main emphasis during the third quarter of the program was on the improvement of the quality of sputtered films, their characterization and use in the fabrication of Schottky barrier type diodes and solar cell structures. Films prepared under different conditions and on different substrates were examined by SEM showing nodular growths under certain conditions. I-V, C-V and photovoltaic characteristics were measured on numerous samples based on n- and p-type films on Ni substrates having top metallization of either evaporated Au and Al. The n-type samples showed up to 200mV V/sub oc/ and small short-circuit currents. The characteristics observed are indicative of the presence of interfacial layer and surface states. Surface state's capacitance were measured on p-type samples metallized with Au.
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Category : Power resources
Languages : en
Pages : 502
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Category : Solar energy
Languages : en
Pages : 600
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Author: K. Vedam
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Category :
Languages : en
Pages : 26
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Author:
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Category : Power resources
Languages : en
Pages : 474
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Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
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Languages : en
Pages : 0
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Category :
Languages : en
Pages : 900
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Category : Aeronautics
Languages : en
Pages : 744
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