In this first of two-article series, we will explain the role of backsheet and materials used in manufacturing. A conventional photovoltaic module (PV module) consists of five general layers. These layers include glass, front encapsulant, solar cells, rear encapsulant, and backsheet. It is the outermost layer of a PV module.
The general role of a backsheet is to act as a protective layer, similar to the function of glass for PV modules. In other words, it is one of those components which ensures long-term reliability (durability) of PV modules when exposed to field conditions of installation. Thus, backsheet has a significant impact on the 25-30 years PV module performance.
Backsheet is usually made from polymeric materials. The market shares of different polymeric backsheets is directly proportional to module production. Although glass is the dominant basksheet material for bifacial PV modules, due to its lower market share, polymeric backsheets account for more than 80% of the solar market.
As a matter of fact, polyvinyl fluoride (PVF) is one of the dominant materials for backsheet, have over a 70% market share in 2019
This article is continued in the next part.
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