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Laser-Welded Edge Seals for Glass/Glass PV Modules

DuraMAT will explore the viability of glass-to-glass laser welding for hermetically sealed photovoltaic (PV) modules.

Glass samples will be laser welded by industrial laser partners and then mechanically tested at the National Renewable Energy Laboratory (NREL) to determine the characteristic strength of the weld. A finite element model of a full-area module will use these input parameters to test the weld under simulated typical mechanical forces and loads experienced by fielded modules.

Core Objective

Module Materials Solutions




This project will explore the use of industrial lasers to edge seal glass/glass modules. The seal should be as strong as the glass, hermetically tight, resulting in faster processing than traditional lamination and providing a step towards a polymer-free, recyclable-friendly PV module.


The final report on this project will be publicly available.


Cvecek et al., Optics Express, Vol 23 No. 5 5682, 2015,

Cvecek et al, Int. J. Extrem. Manuf. 1 (2019) 042001,

Chen et al., Optics Letters, Vol. 44, No. 10, 2019,


To learn more about this project, contact David L. Young.

Rectangle showing solar cell embedded between to glass layers with a shape next to it labeled an Industrial Fiber Laser that indicates the "weld." Below is photo of a PV module with the Fiber laser labeled.

(top right) An industrial fiber laser welds glass-to-glass with high energy, ultra-short pulses of light. (Top left) Embossed glass provides relief for solar cell within the solar module and glass-to-glass edge contact for laser-welded seal. (bottom) Solar modules are edge-sealed with rastered lasers.