Degradation and capacitance-voltage hysteresis in CdTe devices : preprint / D.S. Albin [and others].

Format:

Book

Contributor:

Albin, David S.

National Renewable Energy Laboratory (U.S.)

Language:

English

Subjects (All):

Photovoltaic cells--Research.

Photovoltaic cells.

Solar cells--Design and construction.

Solar cells.

Mercury cadmium tellurides.

Hysteresis.

Genre:

technical reports.

Technical reports

Technical reports.

Physical Description:

1 online resource (12 pages) : illustrations

Place of Publication:

Golden, CO : National Renewable Energy Laboratory, 2009.

Summary:

CdS/CdTe photovoltaic solar cells were made on two different transparent conducting oxide (TCO) structures to identify differences in fabrication, performance, and reliability. In one set of cells, chemical vapor deposition (CVD) was used to deposit a bi-layer TCO on Corning 7059 borosilicate glass consisting of an F-doped, conductive tin-oxide (cSnO2) layer capped by an insulating (undoped), buffer (iSnO2) layer. In the other set, a more advanced bi-layer structure of sputtered cadmium stannate (Cd2SnO4; CTO) as the conducting layer and zinc stannate (Zn2SnO4; ZTO) as the buffer layer was used. CTO/ZTO substrates yielded higher performance devices; however, performance uniformity was worse due to possible strain effects associated with TCO layer fabrication. Cells using the SnO2-based structure, only slightly lower in performance, exhibited considerably greater performance uniformity. When subjected to accelerated lifetime testing at 85 - 100° C under 1-sun illumination and open-circuit bias, more degradation was observed in CdTe cells deposited on the CTO/ZTO substrates. Considerable C-V hysteresis, defined as the depletion width difference between reverse and forward direction scans, was observed in all Cu-doped CdTe cells. Hysteresis increases with increasing stress and degradation; the mechanism is discussed for an ionic-drift model and one involving majority carrier emission in the space-charge region.

Notes:

Title from title screen (viewed August 5, 2009).

"July 2009."

"Presented at the 2009 SPIE Optics + Photonics Meeting, Reliability of Photovoltaic Cells, Modules, Components and Systems II, Proceedings of SPIE, Vol. 7412, San Diego, California, August 2-6, 2009."

Includes bibliographical references (page 12).

OCLC:

429241287