Mechanical Strength of Multicrystalline Silicon Solar Cells and Influencing Factors
نویسندگان
چکیده
Silicon wafer thickness reduction without increasing the wafer strength leads to a high fracture rate during subsequent handling and processing steps. Cracking of solar cells has become one of the major sources of solar module failure and rejection. Hence, it is important to evaluate the mechanical strength of solar cells and factors influencing this. The purpose of this work is to understand the fracture behavior of silicon solar cells and to provide information regarding the bending strength of the cells. The effects on silicon wafer strength of saw damage and of triple junctions, grain size and grain boundaries are investigated. Also the effects of metallization paste type and firing conditions on the strength of solar cells are considered. Significant changes in fracture strength are found as a result of silicon wafer crystallinity and of metallization morphology. It is observed that the aluminum paste type influences the strength of the solar cells.
منابع مشابه
Electrical Properties of Different Types of Grain Boundaries in Multicrystalline Silicon by Photoluminescence Imaging
There are numerous types of Grain Boundaries (GBs) present in multicrystalline silicon wafers, such as ∑3, ∑9, ∑27 and Random Angle (RA) GBs. Small-Angle Grain Boundaries (SA GBs) are also common, and often occur in locally dense networks, creating regions of high recombination. These GBs can limit the efficiency of multicrystalline silicon solar cells, especially when they are decorated with i...
متن کاملOn the origin and formation of large defect clusters in multicrystalline silicon solar cells
Large defect clusters can represent a serious reduction of the material quality of multicrystalline silicon and the efficiency of the resulting solar cells. It is useful to find the origin of these defect rich regions in order to understand their formations. For this work, multicrystalline silicon wafers from different positions of a compensated p type silicon brick were processed to solar cell...
متن کاملA new energy efficient, environment friendly and high productive texturization process of industrial multicrystalline silicon solar cells
A new texturization process based on a uniform, isotropic and slow removal of silicon, using a composition of sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) solution at an elevated temperature is developed recently for multicrystalline silicon solar cells. This process is applied in optimized condition in regular industrial production line and it immediately replaces the old popular in...
متن کاملDirect comparison of the electrical properties of multicrystalline silicon materials for solar cells_ conventional p-type, n-type and high performance p-type
We compare the recombination properties of three important types of multicrystalline silicon wafers for solar cells, namely conventionally-solidified p-type and n-type multicrystalline wafers, and also the recently developed ‘high performance’ p-type multicrystalline wafers. Three distinct regions of the wafers are examined in detail. These are the intra-grain regions, the grain boundaries, and...
متن کامل