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World-leading, Innovative AI-powered Optical Measurement System for Advanced Package Critical Dimens

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World-leading, Innovative AI-powered Optical Measurement System for Advanced Package Critical Dimens
World-leading, Innovative AI-powered Optical Measurement System for Advanced Package Critical Dimens

The National Science and Technology Council (NSTC) is committed to promoting fundamental research and implementing key science and technology policies, with the goal of making Taiwan a world-leading center for advanced manufacturing and semiconductor processes. The NSTC has founded a cross-disciplinary research team, led by Professor Liang-Chia Chen of National Taiwan University's Department of Mechanical Engineering, to integrate cutting-edge technologies such as automated optical inspection (AOI), high-precision measurement, novel optical instrumentation, and AI algorithms. The result is the development of next-gen AOI systems that meet advanced manufacturing and semiconductor needs. The NSTC has also established the Advanced Optical Inspection Equipment Association (AOIEC), composed of academic labs, equipment makers, and users, with 43 member companies, to advance AOI technology in the region.

The AOIEC is a specialized R&D organization focused on developing inline AOI equipment for advanced automated optical inspection and precision engineering industries. It brings together research teams from universities, including NTU, NYCU, NTUST, and NTUT, and collaborates with top-tier semiconductor vendors and Taiwan AOI makers, such as Chroma ATE, Gallant Precision Machining, Tri Technology, and Young Optics, to form a dedicated R&D taskforce. The goal is to develop AI-powered cutting-edge AOI technologies to fill critical technological gaps in optical critical dimension (OCD) metrology for 3D advanced packaging. The system can measure opening sizes down to submicron and has a depth-to-width ratio of 15 times, setting a new technology breakthrough for advanced semiconductor packaging technology. It was awarded the 2022 NSTC Future Technology Award for its achievement.

Semiconductor industry requires breakthroughs to close technology gaps and maintain global competitiveness
Taiwan's semiconductor industry plays a crucial role in the nation's economy and global competitiveness, driving advancements in technology through Moore's Law. The miniaturization of ICs and advancements in 3-D packaging technology bring benefits such as shorter conductor lengths, improved thermal conduction, higher signal bandwidth, lower power consumption, and smaller package volumes, yet also present measurement challenges. The critical dimension measurement of through silicon vias (TSVs) in 3-D packaging and 3-D ICs is challenging due to their small size and high depth-to-width ratio. These CDs directly impact electrical conductivity and process quality, yet current measurement techniques lack simultaneous accuracy and efficiency. The increasing depth-to-width ratio of submicron holes is a key technical issue in the global semiconductor competition, and the development of autonomous measurement technology and equipment is crucial for Taiwan's advancement in this field. According to SEMI's forecast, the demand for advanced measurement technology will continue to increase over the next five years.

Innovative Optical Technology Development to Break Measurement Bottleneck
Silicon vias are a crucial technology in advanced 3D packaging for vertical chip integration. However, as the size of silicon vias decreases and the depth-to-width ratio increases, effective measurement methods become scarce. The industry primarily relies on scanning electron microscopes (SEM) for cross-sectional critical dimension measurement, but this method is destructive and time-consuming. Atomic force microscopy has the potential for profile scanning but is inefficient and limited in accessing the hole interior. To address these challenges, we propose an innovative AI-powered optical measurement technology. Our solution uses physical optical simulation and AI deep learning optimization to penetrate high-depth-ratio blind holes and quickly detect precise critical dimension information, meeting strict inline process time demands.

The developed AI-powered optical measurement technology is based on advanced reflectometry and scatterometry. It uses novel numerical-controlled laser broadband light illumination for optical detection and AI deep learning optimization of inverse reasoning through innovative algorithms. It has overcome the technical barriers of minimum measurable aperture and maximum measurable depth-to-width ratio. The technology has been developed into several innovative optical critical dimension (OCD) measurement systems and techniques, capable of measuring world-leading micron-level silicon via critical dimensions with industrial verified results. The system can measure multiple critical dimension information in real time, with a signal-to-noise ratio (SNR) 28 times higher than non-coherent light sources, a world record achievement. This technology is currently world-leading and can be applied to many challenging measuring scenarios. A Taiwan invention patent (No. 111106641) and a US patent (No. 06A-210153US) have been filed for this development. The technology is also being developed in collaboration with equipment manufacturers and has received technology transfer and further research cooperation from several domestic AOI equipment manufacturers.

Technological transfer and industry validation for complete product and technology implementation
The dedicated R&D team from the AOIEC has successfully developed breakthrough measurement technologies and systems. Currently, our technology has been continuously validated by First tier semiconductor companies in Taiwan and has received continuing industry-academia collaboration and technology transfer from our cooperative AOI makers. Critical dimensions are validated through industrial samples, achieving sub-micron openings and a depth-to-width ratio of 15 times, leading the world's advanced semiconductor packaging technology. The developed deep UV measurement module will be further integrated and tested with the ultra-precision wafer measurement platform for Alva Test validation. The breakthrough in key technology will bring strong competitiveness to Taiwan's semiconductor industry and strengthen Taiwan's unique position in the world's semiconductor industry.

References:
1.Wilson Chien, Komal Thakur, Guo-Wei Wu, Fu-Sheng Yang, Liang-Chia Chen,” New critical dimension optical metrology for submicron high-aspect-ratio structures using spectral reflectometry with supercontinuum laser illumination,” SPIE Europe 2022.
2.Wei-Hsin Chein, Komal Thakur, Fu-Sheng Yang, Zi-Ying Fu, and Liang-Chia Chen,” DUV optical microscopy for measuring high-aspect-ratio sub-micron structures,” ASPEN 2022.
3.Zih-Ying Fu, Wei-Hsien Chien, Fu-Sheng Yang, Liang-Chia Chen*, “Artificial-neural-network-assisted DUV scatterometry for OCD on HAR sub-micron structures,” SPIE Metrology, Inspection, and Process Control XXXVII, AL23 SPIE Advanced Lithography + Patterning, 2023.
4. Fu-Sheng Yang, Zih-Ying Fu, Liang-Chia Chen*, “AI-guided OCD metrology for single HAR sub-micron via measurement,” SPIE Metrology, Inspection, and Process Control XXXVII, AL23 SPIE Advanced Lithography + Patterning, 2023.
5.Wei-Yun Lee, Liang-Chia Chen*, “AI-guided optical-model-based superresolution for semiconductor CD metrology,” SPIE Metrology, Inspection, and Process Control XXXVII, AL23 SPIE Advanced Lithography + Patterning, 2023.

Media Contact:
Ching Chun Tu
Program Manager
Department of Engineering and Technologies
National Science and Technology Council
Phone:(02) 27377527
e-mail:[email protected]

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