There is rapid adoption of the passivated emitter and rear contact (PERC) technology in bifacial cell production – Dr. Kaushik Roy, Senior Scientist and Global Technology Leader, DuPont Photovoltaic Solutions

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Dr. Kaushik Roy Choudhury, Senior Scientist and Global Technology Leader, DuPont Photovoltaic Solutions

Please elaborate about your products and services.

DuPont Photovoltaic Solutions is a leading supplier of specialty materials to the solar energy industry and represents a portfolio of product solutions with over 40 years of service that delivers proven power and lasting value for the fast-growing photovoltaics sector, including DuPont Solamet® metallization pastes, DuPont™ Tedlar® films as well as now DuPont™ Fortasun™ photovoltaic silicones. 

We also work with industry stakeholders to advise on PV quality standards and educate on the importance and correlation of materials to power generation, system lifetimes and safety, and overall levelized cost of energy (LCOE).

What are the technical advancements happening in this industry, can you please brief our readers?

The global PV industry is working on technological advancements across the solar value chain, from solar cell developments to module components to BOS components to O&M innovations. 

There is rapid adoption of the passivated emitter and rear contact (PERC) technology in bifacial cell production. Bifacial modules are implementing innovations in module components through the adoption of polyolefin based encapsulants which help to prevent Potential Induced Degradation (PID), thinner and semi-tempered glass as front- and back-planes for modules, transparent polymeric backsheets with 30+ years of warranty, and thinner and lighter frames. This is being supported by innovations in tracker systems to ensure the promise of increased energy yields.

How do you maintain the quality of your products and what are the standard tests that your products undergo?

Solar plant operators around the globe expect to run their plants as efficiently as possible for longer periods to ensure that power output meets financial expectations. This period is also witnessing an increase in the frequency and extent of module and system failures in the field, precipitated by poor choice of materials and processes. To ensure that DuPont™ Tedlar®-based backsheets (white and transparent) meet the highest standards of performance and maintain it in the field for the expected lifetime, we employ strict testing of the Tedlar® PVF film and the backsheets that go well beyond extended IEC testing. We work very closely with backsheet laminators and employ extensive testing at all stages of the development. DuPont PV backsheet products are qualified through rigorous accelerated sequential tests that combine the stresses of UV, humidity, cycles of temperature and mechanical stresses that simulate real life field situations. Internally the products undergo the module accelerated sequential test (MAST), in addition to extended single stress tests. They are also tested through PV Evolution Lab’s Backsheet Durability Sequence (BDS) which is part of the module Product Qualification Protocol (PQP). 

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