Sangchul Lee

- Dielectric Etch (DRAM) : High aspect ratio (HAR) etch with innovative advanced RF pulsing : Developed multiple etch-back process for the critical mold etch performance evaluation : Published multiple patents regarding HAR process development with advanced RF pulsing

- Developed, optimized, and improved the new processes and exiting processes by engineering semiconductor equipment (NLD-570(ICP tool) and NE-550(TCP tool)) and implementing them into the existing manufacturing line for a reliable and improved wafer process for higher throughput. Responsible for leading the etch process team and managing multiple projects. - Transferred developed and optimized processes to support various customers to drive facility processes and resolve process drifts troubleshoots including tool matching issues. Address customer requests or issues which may involve the definition of a custom device with defining device specifications and documenting the process of the record. - Examined statistical analysis with the design of experiments to improve wafer throughput and minimize tool downtime. Analyzed processed data, tool system data logs, and conducted failure analysis and feedback to determine root causes of process and tool issues. - Engaged in New Product Development projects for the semiconductor film deposition for the process development, scale-up, and technology transfer and worked directly with a team of the leading company in the USA. - Performed and supervised installations and process qualifications of multiple ULVAC plasma etching systems (NLD-570 and NE-550) in CA, NY in the USA, Erlangen in Germany, and other locations, ensuring timely production ramp-up.

- Successfully completed the installation and setup of a brand new research laboratory for developing electronic devices with semiconductors and novel materials, including operations and maintenance. - Developed electrical characterization programs for field-effect transistors and solar cells by using LabView software with subsequent maintenance of several pieces of lab equipment. - Provide administrative and research support for the Institute’s executive staff focusing on streamlining research operations, and improving the outcomes of research products. : Supervised 4 graduate and 6 undergraduate students to advance their projects. - Directed R&D efforts to investigate the effect of nanoconfinement on the crystallization of perovskite material for the optimization of inorganic-organic hybrid solar cells (SCs). : First reported an oriented PbI2/solvent phase in nanostructure measured by 1D and 2D XRD, and achieved a significantly improved crystal stability which is one key issue in the perovskite SCs.

- Conducted synthesis and characterization of the two-dimensional material, and executed fabrication, characterization, optimization, and development of electronic devices such as field-effect transistors and solar cells. - Technology transferred to a company, iPEN Corporation (www.2ipen.com) with the developed a new vacuum transfer method for graphene film to solve a quality and reliability issue - Admitted with a full-scholarship for a full-time position to complete a doctoral degree.

- Developed a flexible graphene device fabrication process by using a rigid substrate combined with a flexible substrate during an international exchange program with a full scholarship.