Scientists in the Netherlands have claimed that a heterojunction metal wrap-through solar module they are designing could offer a 4% performance improvement over conventional heterojunction panels.

The Netherlands Organisation for Applied Scientific Research (TNO) is teaming up with equipment provider Eurotron, solar project developer GroenLeven, and Dutch research institute SIEC to develop a new metal-wrap-through (MWT) solar module based on heterojunction solar cell technology.

The new “Whooper” panel has already demonstrated record efficiencies, according to its developers.

“Over 23% solar cell efficiency on six-inch silicon wafers has already been demonstrated during the proof-of-principle phase with our industrial partner CIC,” Gianluca Coletti, TNO’s program manager for tandem PV technology and applications, told pv magazine. “The concept has been further proven using other partners’ heterojunction pilot lines.”

The research team explained that the Whooper module integrates silicon heterojunction solar cells with back-contact foil technology into a module that is “ready for mass production.” They have also claimed that the back-contact foil technology is the most efficient and elegant solution for the interconnection of heterojunction solar cells.

“Because most of the contacts are placed on the rear, the front of the module is aesthetically much more appealing,” they explained. Compared to conventional heterojunction panels, the new modules are said to provide 4% more power yield at a 3% lower levelized cost of energy (LCOE).

TNO is in charge of the design and optimization of the Whooper cell technology, and already identified cell producers to demonstrate the feasibility of manufacturing on an industrial pilot line. The cell technology is based on six-inch monocrystalline silicon wafers and have been previously used as bottom devices for the development of four terminal tandem silicon/perovskite cells and modules.