Detailed Study of the Correlation between Cross-Linking of Thick SU-8 and UV–NIR Optical Transmission/Photoluminescence Spectroscopy

Abdullah Alharbi, Dhaifallah Almutairi, Hadba Hussain, Salman Alfihed

Research output: Contribution to journalArticlepeer-review

Abstract

SU-8 polymers are promising materials for various applications due to their low cost, excellent thermal stability, and outstanding mechanical properties. Cross-linking of SU-8 is a crucial process that determines the properties of the materials. This study investigates the effect of cross-linking of free-standing SU-8 films on optical transmission and PL emission under various curing conditions. Our findings show that an increase in the cross-linking density reduces optical transmission and causes a red shift of the PL emission band peaks. By directly measuring the optical response of the isolated SU-8, we remove any uncertainty due to the substrate’s presence. Moreover, we show that optical transmission and PL spectroscopy are two non-distractive techniques that can be employed to monitor the curing of the SU-8. This finding enhances our understanding of the cross-linking process in SU-8 and paves the way to further enhance the properties of the SU-8 polymer for various electronics and optoelectronics applications.
Original languageEnglish (US)
Pages (from-to)3866
JournalPolymers
Volume15
Issue number19
DOIs
StatePublished - Sep 23 2023
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2023-09-29
Acknowledgements: This project was funded by King Abdulaziz City for Science and Technology (KACST). This project was supported by King Abdulaziz City for Science and Technology (KACST). The authors gratefully acknowledge the KAUST Nanofabrication Core Lab (NCL) facility and staff for their support and assistance in this work. Additionally, the authors would like to acknowledge Ali Z. Alanizi for his support during the PL measurements, Mohammed S. Alhadman for his support during cross-linking measurements, and Ali A. Algarni for his support during the transmission measurements.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • General Chemistry
  • Polymers and Plastics

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