Title :
Monitoring outdoor performance and photodegradation of a-Si:H modules by evaluation of continuously measured I-V curves
Author :
Kleiss, G. ; Bücher, K. ; Ragot, P. ; Chantant, M.
Author_Institution :
Fraunhofer-Inst. fur Solare Energiesysteme, Freiburg, Germany
Abstract :
The performance of a-Si:H modules is frequently and continuously monitored during outdoor operation. The simple constant field approximation (three parameters) is applied to fit the I-V curves. Indoor measurements demonstrate the sensitivity of the proposed method to monitor photodegradation. The evaluation of outdoor measurements proves that, with the proposed method, the effect of degradation can be isolated from the effects of temperature and irradiance dependent outdoor behavior of the a-Si:H module. The proposed method relates the overall defect density in the module with its outdoor performance and degradation state
Keywords :
amorphous semiconductors; defect states; elemental semiconductors; hydrogen; semiconductor device testing; silicon; solar cell arrays; solar cells; PV modules; Si:H; a-Si:H solar cells; amorphous semiconductor; continuously measured I-V curves; degradation state; indoor measurements; irradiance dependent outdoor behavior; monitoring; outdoor measurements; outdoor performance; overall defect density; photodegradation; simple constant field approximation; Degradation; Energy measurement; Laboratories; Lighting; Monitoring; Poisson equations; Solar energy; Stability criteria; Temperature dependence; Temperature sensors;
Conference_Titel :
Photovoltaic Energy Conversion, 1994., Conference Record of the Twenty Fourth. IEEE Photovoltaic Specialists Conference - 1994, 1994 IEEE First World Conference on
Conference_Location :
Waikoloa, HI
Print_ISBN :
0-7803-1460-3
DOI :
10.1109/WCPEC.1994.520015
