Laser terahertz-emission microscope for inspecting electrical faults in integrated circuits

Area of Science:

• Optoelectronics
• Semiconductor device physics
• Microscopy

Background:

• Integrated circuits (ICs) are crucial components in modern electronics.
• Detecting electrical faults in ICs is essential for quality control and reliability.
• Existing inspection methods may have limitations in resolution or non-destructive capabilities.

Purpose of the Study:

• To propose and develop a novel laser terahertz-emission microscope (LTEM) system.
• To evaluate the LTEM system's capability for inspecting electrical faults in ICs.
• To demonstrate the potential of LTEM as a diagnostic tool for integrated circuits.

Main Methods:

• Development of a custom laser terahertz-emission microscope (LTEM) system.
• Utilizing a femtosecond laser for scanning the IC chip.
• Acquiring two-dimensional terahertz-emission images of the integrated circuit.
• Testing the system on a commercial operational amplifier with induced faults.

Main Results:

• The LTEM system successfully generated clear two-dimensional terahertz-emission images of an operational amplifier IC.
• Distinct differences in LTEM images were observed between a normal IC and a damaged IC with a cut interconnection line.
• The system demonstrated sensitivity to physical defects within the integrated circuit.

Conclusions:

• The developed LTEM system shows significant potential as a non-destructive tool for inspecting electrical faults in integrated circuits.
• LTEM imaging provides a viable method for identifying defects and ensuring the quality of ICs.
• Further development could enhance LTEM's application in semiconductor manufacturing and failure analysis.