• Complex
  • Title
  • Keyword
  • Abstract
  • Scholars
  • Journal
  • ISSN
  • Conference
搜索

Author:

Wang, Mingyuan (Wang, Mingyuan.) | Zhang, Tong (Zhang, Tong.) | Yang, Heng (Yang, Heng.) | Chen, Lin (Chen, Lin.) | Liu, Yanlei (Liu, Yanlei.)

Indexed by:

EI Scopus

Abstract:

Most of nowadays light-emitting diodes (LEDs) based on gallium nitride (GaN) production use sapphire wafers as the growth substrate. However, sapphire exhibits limitations in terms of electrical and thermal conductivities, therefore, GaN must be transferred to more appropriate substrates to fulfill diverse requirements. At present, the transfer of GaN is mainly achieved by means of laser lift-off (LLO), which uses pulses of UV laser light in the nanosecond range. In this study, femtosecond LLO (fs-LLO) technique has been used for GaN delamination. Femtosecond pulsed laser with a wavelength of 800 nm (1.55 eV), and a pulse width of 50 fs was utilized for conducting the laser lift-off experiments, employing photon energy below the GaN band gap (3.4 eV). The reliance on multiphoton absorption and ultrashort pulses in fs-LLO minimizes structural damage compared to conventional LLO approaches. The effect of different laser power and different laser scanning speeds on the fs-LLO processing of GaN has been studied in detail. Various characterization methods, including optical microscopy, scanning electron microscopy, X-ray diffraction, and photoluminescence spectroscopy were used to observe the structural quality of the materials after fs-LLO. The results show that there is less thermal damage on the GaN surface when scanned with a smaller laser power. The scanning speed of the displacement stage affects the surface smoothness of the GaN. The outcome on the flexible tape yielded GaN with high surface quality with no noticeable degradation. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Keyword:

III-V semiconductors Gallium nitride Scanning electron microscopy Femtosecond lasers Energy gap Pulsed lasers Substrates Sapphire Thermal conductivity Photoluminescence spectroscopy

Author Community:

  • [ 1 ] [Wang, Mingyuan]Faculty of Science, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Wang, Mingyuan]School of Physics, Henan Normal University, Xinxiang; 453000, China
  • [ 3 ] [Zhang, Tong]Faculty of Science, Beijing University of Technology, Beijing; 100124, China
  • [ 4 ] [Yang, Heng]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing; 100124, China
  • [ 5 ] [Chen, Lin]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing; 100124, China
  • [ 6 ] [Liu, Yanlei]School of Physics, Henan Normal University, Xinxiang; 453000, China

Reprint Author's Address:

Email:

Show more details

Related Keywords:

Related Article:

Source :

ISSN: 0277-786X

Year: 2024

Volume: 13104

Language: English

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

Affiliated Colleges:

Online/Total:1751/10906767
Address:BJUT Library(100 Pingleyuan,Chaoyang District,Beijing 100124, China Post Code:100124) Contact Us:010-67392185
Copyright:BJUT Library Technical Support:Beijing Aegean Software Co., Ltd.