Applied research on 2-6 compound materials for heterojunction solar cells

Several II-VI heterojunctions show promise for photovoltaic conversion of solar energy. The three of greatest interest are p-CdTe/n-CdS, p-CdTe/n-ZnSe, and p-ZnTe/n-CdSe. Several p-CdTe/n-CdS heterojunction cells have been prepared by close spaced transport deposition of p-CdTe on single crystal n-CdS, and by two source vacuum evaporation of n-CdS on single crystal p-CdTe. Both types of cells, in an experimental stage, are quite comparable, exhibiting values of quantum efficiency between 0.5 and 0.9, open circuit voltages between 0.50 and 0.66 V, fill factors between 0.4 and 0.6, and solar efficiencies up to 4 percent. Cells of p-ZnTe/n-CdSe have also been made by close spaced vapor transport deposition of n-CdSe on single crystal p-ZnTe

Mechanism of the photovoltaic effect in 2-4 compounds Progress report, 1 Apr. - 30 Jun. 1969

Photovoltaic effect in group 2-6 compound

Mechanism of the photovoltaic effect in 2-6 compounds Progress report, 1 Oct. 1968 - 31 Mar. 1969

Heat treatment, illumination and darkness effects, and photovoltaic properties of Cu2S-CdS heterojunction

Mechanism of the photovoltaic effect in 2-6 compounds Progress report, 1 Oct. - 31 Dec. 1969

Electronic transitions involved in photocapacitance at Cd2S-CdS heterojunctio

Mechanism of the photovoltaic effect in 2-6 compounds Progress report, 1 Apr. - 30 Sep. 1967

Mechanism for photovoltaic effects in heterojunctions in group 2 to 6 compounds with metallic or quasimetallic barrier layer

Mechanism of the photovoltaic effect in 2-6 compounds Progress report, 1 Oct. 1967 - 31 Mar. 1968

Mechanisms of photovoltaic effects in heterojunctions in group 2 to 6 compounds with metallic or quasimetallic barrier layer

Mechanism of the photovoltaic effect in II-VI compounds Progress report, 1 Jan. - 31 Mar. 1970

Trapped charging and photovoltaic performance of Cu2S-CdS cell including heat treatment effect

Mechanism of the photovoltaic effects in 2-4 compounds Progress report, 1 Apr. - 30 Sep. 1968

Current gain mechanism in copper sulfide-cadmium sulfide diode upon photoexcitation in presence of reverse bia

Regularity estimates up to the boundary for elliptic systems of difference equations

Regularity estimates up to the boundary for solutions of elliptic systems of finite difference equations were proved. The regularity estimates, obtained for boundary fitted coordinate systems on domains with smooth boundary, involve discrete Sobolev norms and are proved using pseudo-difference operators to treat systems with variable coefficients. The elliptic systems of difference equations and the boundary conditions which are considered are very general in form. The regularity of a regular elliptic system of difference equations was proved equivalent to the nonexistence of eigensolutions. The regularity estimates obtained are analogous to those in the theory of elliptic systems of partial differential equations, and to the results of Gustafsson, Kreiss, and Sundstrom (1972) and others for hyperbolic difference equations

Academic stress and coping strategies for information seeking among undergraduate students in faculty libraries of Ahmadu Bello University, Zaria

This paper discussed academic stress and coping strategies for information seeking among undergraduate students in Ahmadu Bello University, Zaria. The research questions used sought to find out the causes of academic stress of the students that come to the libraries, information seeking styles the students exhibit during stressful situation in the libraries and the coping strategies the undergraduate students use during information seeking in the libraries. Cross-sectional survey method was used. Questionnaire was used as instrument for data collection. The data collected for the study were presented and analyzed using descriptive statistics such as frequency and percentage. The study found out that excessive workload is the cause of academic stress, the information seeking style used by the undergraduate students during stressful situation was by reading the textbook in the faculty’s libraries and relaxation was the coping strategy used by the undergraduate students during stressful condition in the faculties libraries. It was concluded that academic stress has influence on information seeking among undergraduate students of Ahmadu Bello University, Zaria that come to the faculties libraries. The study recommended that the work load for undergraduate students of Ahmadu Bello University Zaria, should be reduced in order to enable them perform well in their study, Apart from reading textbooks by undergraduate students in Ahmadu Bello University, Zaria that come to the faculties libraries with academic stress, other information resources such as websites, databases among others should be used because, through these resources information that can help the students in understanding their field of studies are sought and the undergraduate students in Ahmadu Bello University Zaria should use other stress coping strategies such as seeking professional support, among others in order to reduce the stress face during the use of the library