The Light and elevated Temperature Induced Degradation (LeTID) of PERC solar cells results in considerable power losses. A new process, developed by the Fraunhofer Center for Silicon Photovoltaics CSP, enables a prediction of possible yield losses, even under different climatic conditions. The method is presented by the Fraunhofer CSP at the Intersolar trade fair from 15-17 May 2019 in Munich.
As of now, the Light and elevated Temperature Induced Degradation (LeTID) of PERC solar cells is an unpredictable risk in the solar industry. This effect occurs relatively slowly under influence of light at temperatures above 50 ° C. It results in significant power loss of up to 6 percent. At the Fraunhofer CSP, a model for degradation trajectories has been developed that calculates associated yield losses and also takes into account various climatic influences.
“We use the possibilities of big data and digitization to provide our customers with tools required for risk control. By analyzing performance data, we can quantify the yield losses to be expected and differentiate between different products,” says Prof. Ralph Gottschalg, Head of Fraunhofer CSP. This technique allows mitigation of a major risk and supports techno-economic assessment of PV plants. The work will be presented at booth C1.371.
In addition, the Fraunhofer CSP will present innovative approaches for the reliable design of lightweight modules. At booth C1.371 visitors can also have a hands on experience of the PIDcheck mobile test device from 11 am to 2 pm on Thursday, May 16th. It enables a fast, inexpensive and mobile testing of solar modules for Potential-Induced Degradation (PID).
About the Fraunhofer Center for Silicon Photovoltaics CSP
The Fraunhofer CSP conducts applied research into silicon crystallization, wafer production, solar cell and module characterization, module technology, components and system reliability, developing in the process new technologies, product and test concepts along the entire photovoltaic value chain. The Center’s work is focused on the assessment of the reliability of solar cells and modules under laboratory and operating conditions as well as electrical, optical, mechanical and microstructural material and component characterization. Focusing its activities in this way enables the Center to develop measurement methods, devices and production processes for components and materials based on an understanding of failure mechanisms and offers increased levels of reliability. The portfolio of research activities in the field of photovoltaics is complemented by research into renewable hydrogen production and the storage and utilization of this gas, in particular the development, characterization and testing of new materials for fuel cells and electrolyzers, as well as the simulations and economic feasibility studies of decentralized photovoltaic electrolysis systems. The Fraunhofer CSP is a joint initiative of the Fraunhofer Institute for Microstructure of Materials and Systems IMWS and the Fraunhofer Institute for Solar Energy Systems ISE.
