Home 연구동향 김문호 교수 연구성과

김문호 교수 연구성과

by kseasingapore

Black Germanium Photodetector Exceeds External Quantum Efficiency of 160%

  • The development of reliable methods to fabricate nanostructured semiconductor materials is important in the creation of advanced optoelectronic devices including photodetectors.
  • Prof. Kim Munho and his team built the germanium pyramids, which are 150 nm wide and 570 nm high, using a room-temperature chlorine-gas-based reactive ion etching process that takes only 2 min.
  • The nanostructuring reduces the average light reflectance from 37% for a pristine planar germanium wafer to 2%. The enhanced light trapping created by this geometry leads to improved absorption and a responsiveness of 2.01 A W–1, which is two and a half times higher than the responsiveness of non-structured germanium.

Our work was exclusively featured by Research Highlight of Nature Electronics (IF: 33.686)

High performance flexible visible-blind UV optical sensors with 2DEG based on unconventional release strategy

  • Flexible UV sensors based on the two-dimensional electron gas (2DEG) at the interface of AlGaN/GaN heterostructure membranes have been firstly fabricated using AlGaN/GaN on insulator substrates via an unconventional release strategy.
  • Under a range of external strains (compressive, flat, and tensile), the sensors recorded a responsivity level of 100 times higher than existing UV sensors. This responsivity remained stable after 100 cycles of repetitive bending, demonstrating its potential to be integrated into wearables.

Related Articles

Leave a Comment