Real-time predictive control of photoresist film thickness uniformity

LL Lee, CD Schaper, WK Ho - IEEE Transactions on …, 2002 - ieeexplore.ieee.org
With the trends toward larger wafer size and the linewidth going below 100 nm, one of the
challenges is to control the resist thickness and uniformity to a tight tolerance in order to …

Estimation of wafer warpage profile during thermal processing in microlithography

A Tay, WK Ho, N Hu, X Chen - Review of scientific instruments, 2005 - pubs.aip.org
Wafer warpage is common in microelectronics processing. Warped wafers can affect device
performance, reliability, and linewidth control in various processing steps. Early detection …

Minimum time control of conductive heating systems for microelectronics processing

A Tay, WK Ho, YP Poh - IEEE transactions on semiconductor …, 2001 - ieeexplore.ieee.org
A minimum time control scheme is designed to improve repeatability by minimizing the
loading effects induced by the common processing condition of placement of a …

Resist film uniformity in the microlithography process

WK Ho, LL Lee, A Tay… - IEEE transactions on …, 2002 - ieeexplore.ieee.org
With the trends toward smaller feature size, one of the challenge is to control the resist
thickness and uniformity to a tight tolerance in order to minimize thin film interference effects …

Development of high-power VCSEL emitter of size 30mm x 30mm, scalable in two dimensions and applicable to Si wafer annealing

Y Noh, S Park, BK Kim, WJ Park, T Kim… - International Journal of …, 2022 - Elsevier
Two-dimensionally scalable vertical cavity surface emitting laser (VCSEL) emitter of size 30
mm× 30 mm was designed and fabricated for practical applications in the rapid heating …

In situ fault detection of wafer warpage in microlithography

WK Ho, A Tay, Y Zhou, K Yang - IEEE transactions on …, 2004 - ieeexplore.ieee.org
Wafer warpage is common in microelectronics processing. Warped wafers can affect device
performance, reliability and linewidth control in various processing steps. We proposed in …

On control of resist film uniformity in the microlithography process

WK Ho, A Tay, LL Lee, CD Schaper - Control engineering practice, 2004 - Elsevier
A novel approach to improve photoresist thickness uniformity after the conventional spin-
coating and softbake process is proposed in this paper. Using an array of thickness sensors …

Constraint feedforward control for thermal processing of quartz photomasks in microelectronics manufacturing

A Tay, WK Ho, CD Schaper, LL Lee - Journal of Process Control, 2004 - Elsevier
A feedforward control scheme is designed to improve performance of conductive heating
systems used for lithography in microelectronics processing. It minimizes the loading effects …

A quality prognostics scheme for semiconductor and TFT-LCD manufacturing processes

YC Su, FT Cheng, GW Huang… - … Annual Conference of …, 2004 - ieeexplore.ieee.org
A quality prognostics scheme for predicting the product quality during the semiconductor or
TFT-LCD manufacturing processes is proposed in this work. This scheme considers the …

Thermal modelling and design of dynamically-controlled heater plates for high temperature processing of 300 mm wafers

DS Woo, C Han, BD Youn, KJ Kim - Journal of Mechanical Science and …, 2019 - Springer
The temperature uniformity of heater plates (HPs) should be sustained due to critical
dimension uniformity and robust operation in high temperature processing of 300 mm …