Research Project »PV Extreme«
In the solar belt of the earth solar modules must withstand extreme conditions. Fraunhofer IMWS is working on solutions that also enable building-integrated photovoltaics..
Using microstructural investigations of dusty glasses from outdoor experiments in Qatar, the cause of the strong adhesion of dust could be clarified. The reason for this fenomenon are cementation processes which take place, in particular, in the presence of moisture / condensation. On the basis of these findings a test set-up was developed, which can depict soiling processes of solar modules in a realistic manner.
The Fraunhofer CSP combines climate analysis with simulations of virtual prototypes to describe the progress of the fatigue of ductile materials such as the copper core of solar cell connectors. Furthermore, a test set-up has been developed, which allows to carry out life cycle analyzes of solar cell interconnectors in the modulaminate quickly and with little effort.
In order to assess the effects of cleaning processes on anti-reflection coatings, after accelerated cleaning and abrasion tests surfaces were examined at the microstructural level (cooperation with PI Berlin). For this purpose, the methods of optical microscopy and scanning electron microscopy (SEM) were used at Fraunhofer CSP. The results show the interrelationship between microstructural changes of the glass surfaces and macroscopic reflection measurements. Furthermore, it was shown that the abrasion tests can represent the damage patterns of the cleaning experiments with a significantly lower number of test cycles.
Under illumination, the efficiency of solar cells and modules can be reduced by up to 20% rel. This is particularly noticeable in desert regions because there the process is accelerated by high temperatures and irradiation. At Fraunhofer CSP, we investigate the causes of LID mechanisms and develop models that quantify the degradation and regeneration. In addition to the investigations we develop devices that enable rapid degradation tests under controlled conditions and an assessment of the regeneration potential.
On the basis of the cause research we developed an innovative procedure suitable for mass production, that helps to prevent the light-induced degradation. By means of specific kinetic models for individual LID types, predictions can be made about the necessary parameters of the stabilization process. Together with industrial partners, a prototype is to be developed, which can be used in the current solar cell production. This intends to ensure long-term stability of the modules even under extreme climatic conditions.
Within this project Fraunhofer CSP focuses on the analysis of defects and degradation phenomena of PV modules. In particular, the soiling of PV modules in desert regions is a major focus. Another focus is the degradation of plastic components and the impact on components such as solar cells and solar cell connectors. On this basis, we aim to define boundary conditions to specifically adapt PV modules with regard to the requirements in desert regions.
The project is funded by the BMWi promotion code 0325735C.
The aim of the project is the development of special encapsulation materials for application in buildings. The focus of the Fraunhofer CSP within this project is the definition of extended test sequences for the requirements in extreme climatic zones.
The project is sponsored by the state of Saxony-Anhalt - project number 1604/00009.
Within this project Fraunhofer CSP deals with the lifetime analysis of solar cell connectors. The aim is to develop a simulation-based model, which allows fatigue analyses for different climate zones. In addition, we develop a test method to carry out such analyses also experimentally and, e.g. as a quality assurance test.
The project is funded by the Federal Ministry of Economics and Energy (BMWi) within the »R & D PV« project »LAURA« (project number: 0325716B).