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Title: Direct Analysis of JV-Curves Applied to an Outdoor-Degrading CdTe Module (Presentation)

We present the application of a phenomenological four parameter equation to fit and analyze regularly measured current density-voltage JV curves of a CdTe module during 2.5 years of outdoor operation. The parameters are physically meaningful, i.e. the short circuit current density Jsc, open circuit voltage Voc and differential resistances Rsc, and Roc. For the chosen module, the fill factor FF degradation overweighs the degradation of Jsc and Voc. Interestingly, with outdoor exposure, not only the conductance at short circuit, Gsc, increases but also the Gsc(Jsc)-dependence. This is well explained with an increase in voltage dependent charge carrier collection in CdTe.
Authors:
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Publication Date:
OSTI Identifier:
1124005
Report Number(s):
NREL/PR-5200-61450
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the PV Module Reliability Workshop, 25-26 February 2014, Golden, Colorado; Related Information: NREL (National Renewable Energy Laboratory)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; DIRECT ANALYSIS; JV-CURVES; OUTDOOR; DEGRADING; CDTE MODULE; PHENOMENOLOGICAL; PARAMETER EQUATION