Toray Industries, Inc. has announced that it is ready to begin mass production of its STF-1000 photosensitive polyimide solution. This advanced material represents a major milestone in the company’s ongoing efforts to expand the capabilities of its proprietary negative-type photosensitive technology.
Notably, STF-1000 enables high-aspect-ratio patterning with a ratio of 36 in films up to 500 micrometers thick. High-aspect-ratio patterning technology allows manufacturers to create microstructures that are both extremely narrow and tall, which is critical for next-generation electronic and microfabrication applications.
Early Industry Evaluations and Application Areas
To assess its industrial potential, Toray began supplying STF-1000 samples to customers last year. Companies have since evaluated the material across a range of applications, including electronic components, micro-electromechanical systems (MEMS), and other advanced devices.
MEMS technology integrates micro-mechanical components, sensors, actuators, and related elements using microfabrication techniques originally developed for semiconductor manufacturing. Consequently, the demand for advanced materials capable of supporting such technologies has grown rapidly.
Recognition for Breakthrough Innovation
In recognition of this technological achievement, Toray received the Chemical Society of Japan Award for Young Chemists in Technical Development for 2025. The award acknowledges the company’s success in developing high-aspect-ratio patterning technology while preserving the core advantages of polyimide materials.
Polyimide structures are valued for their excellent heat and chemical resistance, strong mechanical properties, superior insulation, and durability against ultraviolet radiation. By maintaining these characteristics, Toray has ensured that the new material performs reliably in demanding manufacturing environments.
Role of Photolithography in Advanced Manufacturing
Photolithography plays a crucial role in producing high-resolution circuit patterns across large surfaces. In this process, manufacturers coat substrates with photosensitive materials and expose them to light to create precise patterns.
Because of its accuracy and scalability, photolithography is widely used in the production of semiconductors, liquid crystal displays, and advanced sensors. As device architectures become increasingly complex, the need for materials compatible with high-precision microfabrication continues to rise.
Growing Demand Driven by MEMS Miniaturization
In recent years, the push to miniaturize electronic components and increase integration density has accelerated the development of MEMS devices. As a result, manufacturers now require photosensitive materials that can withstand complex processing steps and enable high-aspect-ratio patterning in thick films.
However, conventional materials have faced significant limitations. When film thickness exceeds 200 micrometers, many products tend to delaminate from substrates or develop cracks during processing. These reliability challenges have restricted their use in advanced microfabrication.
Toray’s Polymer Design Breakthrough
To overcome these limitations, Toray strengthened its polymer design technology for negative-tone photosensitive materials. Through this effort, the company developed a photosensitive polyimide capable of suppressing pattern distortion and cracking even in thick films.
As a result, the new material achieves an aspect ratio of 36 in films thicker than 200 micrometers. This breakthrough enables the fabrication of a wide range of complex microstructures, including semiconductor vias and MEMS components.
Expanding Applications Across Industries
Beyond semiconductor and MEMS manufacturing, the material also serves in scintillator panels used in X-ray non-destructive testing equipment. A scintillator panel converts incoming X-rays into visible light, enabling imaging systems to detect internal structures.
Looking ahead, Toray expects STF-1000 to support diverse applications in advanced semiconductor technologies, microfluidic devices, and other precision engineering fields.
Development of PFAS-Free Alternative
In addition to STF-1000, Toray developed STF-2000 in 2025. This new photosensitive polyimide eliminates per- and polyfluoroalkyl substances (PFAS), aligning with growing global demand for environmentally responsible materials.
The company is currently exploring STF-2000 applications primarily in electronic components and microfluidic devices, where sustainable material solutions are increasingly important.
Commitment to Advanced Materials Innovation
Going forward, Toray will continue to leverage its expertise in synthetic organic chemistry, polymer chemistry, biotechnology, and nanotechnology to develop next-generation materials.
Through sustained research and innovation, the company aims to create groundbreaking technologies that drive industrial transformation while reinforcing its long-standing commitment to delivering new value and contributing to societal progress.
