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Title: Performance Stabilization of CdTe PV Modules using Bias and Light

Reversible performance changes due to light exposure frustrate repeatable performance measurements on CdTe PV modules. It is common to use extended light-exposure to ensure that measurements are representative of outdoor performance. We quantify the extent to which such a light-exposed state depends on module temperature and consider bias in the dark to aid in stabilization. We evaluate the use of dark forward bias to bring about a performance state equivalent to that obtained with light exposure, and to maintain a light-exposed state prior to STC performance measurement. Our results indicate that the most promising method for measuring a light-exposed state is to use light exposure at controlled temperature followed by prompt STC measurement with a repeatable time interval between exposure and the STC measurement.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1136577
Report Number(s):
NREL/CP-5J00-61240
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 40th IEEE Photovoltaic Specialists Conference, 8-13 June 2014, Denver, Colorado
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; PERFORMANCE; STABILIZATION; TRANSIENTS; CDTE; THIN-FILM; MODULE; LIGHT SOAK; METASTABILITY; TRANSIENT; Solar Energy - Photovoltaics