Abstract
Thin-film photovoltaic modules are known to exhibit light-induced transient behavior which interferes with accurate and repeatable measurements of power. Typically power measurements are made after a light exposure in order to target a light state of the module that is representative of outdoor performance. Here we show that the concept of a unique light state is poorly defined for both CIGS and CdTe modules. Instead we find that their metastable state after a light exposure can depend on the temperature of the module during the exposure. We observe changes in power as large as 5.8% for a 20°C difference in light exposure temperature. These results lead us to conclude that for applications in which reproducibility and repeatability are critical, module temperature should be tightly controlled during light exposure.
Original language | American English |
---|---|
Number of pages | 3 |
DOIs | |
State | Published - 14 Dec 2015 |
Event | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States Duration: 14 Jun 2015 → 19 Jun 2015 |
Conference
Conference | 42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 |
---|---|
Country/Territory | United States |
City | New Orleans |
Period | 14/06/15 → 19/06/15 |
Bibliographical note
See NREL/CP-5J00-64417 for preprintNREL Publication Number
- NREL/CP-5J00-66356
Keywords
- characterization
- light soak
- measurement
- Metastability
- photovoltaic
- solar
- thin film
- transient