German scientists research causes of LeTID

• Scientists at Germany's Fraunhofer Institute for Integrated Solutions and Device Modern technology IISB are attempting to recognize the sources of light and elevated temperature induced degradation (LeTID) in PERC solar cells. First examinations must offer a comprehensive understanding of the process and also product dependence of LeTID and also associated degradation effects in monocrystalline and multicrystalline PERC solar cells.

The development of passivated emitter and also rear contact (PERC) solar cell modern technology has actually allowed producers to boost the performance of crystalline silicon cells to over 22% for monocrystalline products and regarding 20% for multicrystalline tools. Scientists at Germany's Fraunhofer Institute for Integrated Solutions and also Tool Innovation IISB are currently collaborating No Degradation, a joint job researching mono- and multicrystalline PERC solar cells, to bring performance losses in PERC solar cells to zero.

The performance of PERC solar cells can drop by several percentage points throughout procedure. The researchers want to concentrate on one of the major reasons for performance loss-- light as well as elevated temperature induced degradation (LeTID). According to the Fraunhofer IISB scientists, the devices as well as source of LeTID are still not completely comprehended.

Under the framework of the job, basic examinations must at first give a detailed understanding of the procedure and also product dependence of LeTID as well as associated degradation effects in monocrystalline as well as multicrystalline PERC solar cells. The scientists intend to discover the cause in produced monocrystalline and multicrystalline wafer materials, and also in the specific steps of solar cell production. The partial results will then be combined in order to accomplish an absolutely no degradation principle for the commercial production modern technology of multi- and also monocrystalline PERC solar modules.

The researchers are likewise concentrating on the communication of impurity aspects in the wafer base material with the hydrogen. These pollutants are presented during the production of the solar cell in the surface area passivation action.

Along with Fraunhofer IISB, the Zorro project consortium consists of the International Solar power Proving ground Konstanz e.V. (ISC), the University of Konstanz (UKN), as well as the Institute for Applied Physics (IAP) of the Technical College Bergakademie Freiberg (Saxony). The associated industry partners are Wacker Chemie and also Centrotherm International.