As the demand for thinner , lighter and more flexible electronic devices grows , the need for advanced manufacturing processes has become critical . Polyimide ( PI ) films are widely used in these applications due to their excellent thermal stability and mechanical flexibility . They are crucial for emerging technologies like rollable displays , wearable sensors and implantable photonic devices . However , when the thickness of these films is reduced below 0.005mm , traditional laser lift-off ( LLO ) techniques often fail . Mechanical deformation , wrinkling and leftover residues frequently compromise the quality and functionality of ultrathin devices , making the process inefficient and costly .

In this view , researchers turned to graphene , a nanomaterial known for its exceptional thermal and mechanical properties . A research team from Seoul National University of Science and Technology ( SEOULTECH ), led by Professor Sumin Kang , has designed a novel technique to overcome the challenges with the LLO process . Their innovative graphene-enabled enhanced laser lift-off ( GLLO ) method ensures ultrathin displays can be separated smoothly and without damage – making them perfect for wearable applications . Their study was published in the journal Nature Communications on September , 2024 . left the substrates wrinkled and the glass carriers unusable due to stubborn residues . This breakthrough has far-reaching implications for stretchable electronics and wearable devices .

The researchers further showcased the potential of the GLLO process by creating organic light-emitting diode ( OLED ) devices on ultrathin PI substrates . OLEDs processed with GLLO retained their electrical and mechanical performance , showing consistent current density-voltageluminance properties before and after lift-off . These devices also withstood extreme deformations , such as folding and twisting , without functional degradation . Additionally , carbonaceous residues on the glass carrier were reduced by 92.8 %, enabling its reuse . These findings highlight GLLO as a promising method for manufacturing ultrathin and flexible electronics with improved efficiency and reduced costs .

“ Our method brings us closer to a future where electronic devices are not just flexible , but seamlessly integrated into our clothing and even our skin , enhancing both comfort and functionality ,” said Prof Kang . Using this method flexible devices that provide real-time monitoring , smartphones that roll up or fitness trackers that flex and stretch with your movements can be designed easily .

Moving forward , the research team plans to optimise the process further , focusing on complete residue elimination and enhanced scalability . With its potential to revolutionise the electronics industry , the GLLO process marks a significant stride toward a future where ultrathin , flexible and high-performance devices become viable options for daily use . �

In this study , they have introduced a novel GLLO process that integrates a layer of chemical vapour deposition-grown graphene between the PI film and its glass carrier . “ Graphene ’ s unique properties , such as its ability to absorb ultra-violet ( UV ) light and distribute heat laterally , enable us to lift off thin substrates cleanly , without leaving wrinkles or residues ,” said Prof Kang . Using the GLLO method , the researchers successfully separated 0.0029mm thick ultrathin PI substrates without any mechanical damage or carbon residue left behind . In contrast , traditional methods

www . intelligenthealth . tech 55