The Materials Behind Long-Term PV Module Reliability

It is natural that cost metrics and conversion efficiency take the limelight when evaluating a PV module’s performance. There is a third attribute that is equally important to the industry's success: reliability.

Photovoltaics represent a remarkable anomaly in the global commodities market, routinely offering performance warranties spanning 25 to 30 years. To maintain physical and electrical integrity over nearly 3 decades of continuous outdoor exposure, a module requires an exceptionally robust bill of materials (BOM). While numerous components contribute to this long-term endurance, specialized polymers play a crucial role here. Historically, this protective envelope has relied on 2 key elements: encapsulation films that sandwich the solar cell matrix, and, depending on the module configuration, protective backsheets. Today, these polymeric materials are becoming increasingly critical to the structural and financial health of the PV industry.

Currently, the materials segment finds itself squeezed from opposite ends of the economic spectrum. On the one hand, module manufacturers continue to pursue aggressive cost reductions, while on the other, raw material costs are increasingly affected by geopolitical uncertainties and sudden supply chain disruptions. From a technological standpoint, the era of a ‘one size fits all’ polymer solution has drawn to a close. Modern packaging films are rapidly evolving to become highly specific to individual cell architectures. Encapsulation formulations and layering configurations must now precisely adapt to the electrical and chemical sensitivities of the cell technology used, while also factoring in whether they are placed on the front or rear side of the module.

The diversification of global PV installations is accelerating the need for material customization. Solar power is expanding beyond traditional ground-mounted and rooftop arrays into more demanding, application-specific environments. In settings such as hyper-arid deserts, floating PV plants, agrivoltaics systems, and building-integrated PV (BIPV) structures, polymers are the primary engineering enablers that enable these specialized applications.

Concurrently, the backsheet market is navigating a significant structural shift. With the accelerating commercial adoption of TOPCon technology, the manufacturing landscape has heavily favored glass-glass module configurations. As a result, the backsheet segment has been experiencing a decline in mainstream market share. Nevertheless, glass-backsheet designs remain relevant and preferred in specific regions and a few applications.

TaiyangNews has tracked the continuous evolution of these 2 vital components for many years, and reflecting the changing dynamics of the PV polymer landscape, we have also optimized the title of this 6^th edition of the survey. While the previous editions were titled Backsheets and Encapsulation Materials, the growing importance and innovation surrounding encapsulation materials – coupled with the declining relevance of backsheets in mainstream module manufacturing – have prompted us to slightly revise the title of the 6^th  edition to TaiyangNews Market Survey on Encapsulation Materials and Backsheets 2026. The change in order is subtle, but it mirrors the evolving priorities of the industry. Another notable development in this edition of the survey is the inclusion of India-specific market insights. These inputs were received not only from domestic film manufacturers but also from several global players operating in the Indian market.

In this 6^th edition of the TaiyangNews Market Survey on Encapsulation Materials & Backsheets 2026, we provide a thorough analysis of the latest techno-commercial advancements associated with these essential polymers used in module building. This report also includes an updated, detailed index of commercial products from the leading suppliers.

The text is an edited excerpt from TaiyangNews Market survey on Encapsulation Materials & Backsheets 2026, which can be downloaded for free here.