Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Russell M. Geisthardt"'
Publikováno v:
IEEE Journal of Photovoltaics. 5:1217-1221
The status of the highest efficiency CdTe solar cells is presented in the context of comparative loss analysis among the leading technologies for single- and polycrystalline photovoltaic materials. The Shockley–Queisser limit of a single-junction c
Publikováno v:
Progress in Photovoltaics: Research and Applications. 23:1484-1492
A major source of loss in cadmium sulfide/cadmium telluride (CdS/CdTe) solar cells results from light absorbed in the CdS window layer, which is not converted to electrical current. This film can be made more transparent by oxygen incorporation durin
Autor:
Ali Abbas, Amit Munshi, Russell M. Geisthardt, James R. Sites, Jennifer Drayton, Drew E. Swanson, Walajabad S. Sampath, John Raguse
Publikováno v:
MRS Proceedings. 1771:133-138
The addition of a CdMgTe (CMT) layer at the back of a CdTe solar cell should improve its performance by reflecting both photoelectrons and forward-current electrons away from the rear surface. Higher collection of photoelectrons will increase the cel
Publikováno v:
IEEE Journal of Photovoltaics. 5:360-365
Limitations in performance and the status of single-junction solar cells are reviewed. Conversion efficiency in single-junction solar cells is systematically analyzed in terms of energy conversion efficiency, the Shockley-Queisser (SQ) efficiency lim
Publikováno v:
Applied Physics A. 118:1259-1265
The effects of Zn(O,S) buffer layer parameters on CuInGaSe (CIGS) cell performance are investigated using a physically based solar cell model. The key issue for CIGS solar cells is to remove destructive effects like pinholes due to thinning buffer la
Autor:
Russell M. Geisthardt, James R. Sites
Publikováno v:
IEEE Journal of Photovoltaics. 4:1114-1118
Light-beam-induced current measurements have been used for characterization of nonuniformities in cadmium telluride (CdTe) solar cells. Spectral dependence, voltage-bias dependence, and resolution dependence are used for detailed characterization of
Publikováno v:
IEEE Journal of Photovoltaics. 3:838-842
A hollow-cathode plasma-cleaning source, designed for uniformity, was added to the load-lock region of an existing single-vacuum CdTe-cell fabrication system. This plasma source cleans the transparent-conductive-oxide layer of the cell prior to the d
Publikováno v:
MRS Proceedings. 1538:269-274
The traditional CdCl2 passivation of CdTe is expanded by adding other chlorides such as MgCl2, NaCl, and MnCl2 into the process through a two-step passivation procedure that combines closed space sublimation step with a vapor process. This allows the
Publikováno v:
2014 IEEE 40th Photovoltaic Specialist Conference (PVSC).
An accelerated-life-testing (ALT) system has been built at the Colorado State University Photovoltaics Laboratory with an emphasis on versatility and periodically performing a suite of electronic measurements on stressed devices. The setup utilizes a
Autor:
Russell M. Geisthardt, James R. Sites
Publikováno v:
2014 IEEE 40th Photovoltaic Specialist Conference (PVSC).
In this work, light-beam-induced-current (LBIC) measurements are discussed as a characterization tool for nonuniformities in solar cells. A modification of the measurement procedure has reduced the measurement time by at least a factor of 5, which re