Timon S. Vaas
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View article: A Gaussian Process Regression <i>IV</i> Model for PV Outdoor Data
A Gaussian Process Regression <i>IV</i> Model for PV Outdoor Data Open
Outdoor data are essential to study the reliability of PV modules and systems. Each electrical performance measure is dependent on the conditions the measurement is conducted at and, therefore, needs to be considered in the context of dyna…
View article: An electro-thermal finite element method (FEM) model for local hotspot kinetics in Cu(In, Ga)Se2 thin-film solar modules
An electro-thermal finite element method (FEM) model for local hotspot kinetics in Cu(In, Ga)Se2 thin-film solar modules Open
Partial shading can significantly impair the efficiency of thin-film solar cells. When exposed to partial shading, cells within the array tend to become reverse biased, leading to thermal runaway events and the emergence of hotspots. In Cu…
View article: Light induced degradation of CIGS solar cells
Light induced degradation of CIGS solar cells Open
Considering warranted lifetimes of PV modules of typically 20-30 years, the performance stability of PV modules is one of the most crucial factors regarding power generation and yield. Long term outdoor performance studies depict realistic…
View article: Extrapolating CIGS Module Performance From Laboratory Cell Performance Using IEC61853 Standard Reference Climatic Profiles
Extrapolating CIGS Module Performance From Laboratory Cell Performance Using IEC61853 Standard Reference Climatic Profiles Open
In general, cell development and optimization is performed w.r.t. the cell performance parameters under standard test conditions (STC). However, as the performance of solar cells varies with temperature and irradiation, a single measuremen…
View article: Reverse-Bias Defect Creation in Cu(In,Ga)Se2 Solar Cells and Impact of Encapsulation
Reverse-Bias Defect Creation in Cu(In,Ga)Se2 Solar Cells and Impact of Encapsulation Open
Reverse breakdown in Cu(In,Ga)Se2 (CIGS) solar cells can lead to defect creation and performance degradation. We present pulsed reverse-bias experiments, where we stress CIGS solar cells with a short reverse voltage pulse of ten millisecon…
View article: Thermal Stimulation of Reverse Breakdown in CIGS Solar Cells
Thermal Stimulation of Reverse Breakdown in CIGS Solar Cells Open
The underlying mechanisms of the initial stages of hot-spot and therefore defect creation due to reverse breakdown in Cu(In,Ga)S solar cells are not well understood. We test the thesis, that permanent damage is created due to a positive f…