ELECTRIC VEHICLES Tripartite collaboration delivers high-performance GaN power module

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Rogers Corporation

DOWA HD Europe GmbH

Heraeus Electronics GmbH & Co. KG

VisIC Technologies Ltd. has partnered with Heraeus Electronics and PINK to develop an advanced power module utilizing D3GaN technology. This power module is based on a silicon nitride ceramic substrate, an innovative silver sintering process and advanced top side interconnect, promising unprecedented reliability and performance for battery electric vehicles.

The collaboration brings together VisIC’s expertise in gallium nitride (GaN)-based devices, Heraeus Electronics’ cutting-edge packaging materials know-how, and PINK’s state-of-the-art sintering technology. The synergy of these three companies has culminated in the development of a power module that is setting new standards for GaN based power modules to revolutionize the electric vehicle (EV) industry.

D3GaN technology

VisIC’s D3GaN technology is at the heart of this power module, offering significant improvements in efficiency, thermal management, and power density. This technology leverages the superior electrical properties of gallium nitride to deliver faster switching speeds and higher power handling capabilities compared to traditional silicon-based devices.

Silicon nitride metal ceramic substrate

The use of a Silicon nitride (Si₃N₄) metal ceramic substrate is a key innovation in this power module. Si₃N₄ is known for its excellent thermal conductivity, mechanical strength, and reliability under high-temperature conditions. These properties are crucial for the demanding environment of electric vehicle applications, ensuring the power module can withstand the rigors of everyday use while maintaining optimal performance.

Silver sintering process

The adoption of the silver (Ag) sintering process by PINK enhances the thermal and electrical conductivity of the module. Silver sintering is a low-temperature bonding process that creates robust and reliable connections between components, improving the module’s overall durability and efficiency. This process is critical for the high reliability required in EV powertrains, where consistent performance is non-negotiable.

High-reliability module for battery electric vehicles

The resulting power module is designed to meet the stringent reliability and performance standards of the electric vehicle industry. Its advanced materials and innovative construction techniques ensure it can deliver the high-power density of over 500Arms/650V and efficiency needed for modern BEVs (battery electric vehicles), while also offering long-term reliability and durability at a cost point near silicon devices.

Industry impact

This collaboration marks a significant milestone in the advancement of power electronics for electric vehicles. The integration of VisIC’s D3GaN technology with Heraeus Electronics’ sintering paste and PINK’s Ag and Cu sintering process and flexible sintering equipment sets a new benchmark for power module performance in the EV market. This innovation is expected to drive the adoption of GaN technology in EV applications, paving the way for more efficient, reliable, and sustainable electric transportation solutions.

Dr. Michael Jörger, EVP Head of Business Line Power Electronic Materials from Heraeus Electronics stated: “With our materials, application know-how and engineering services we are glad to work with our partners on speeding up the innovative approach of highly efficient GaN modules for automotive applications.”

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