Proving direct band gap property of a semiconductor

Click For Summary
SUMMARY

The discussion focuses on proving the direct band gap property of Transition Metal Dichalcogenides (TMDs) through experimental methods. The user suggests using Photoluminescence (PL) measurements for optical band gap verification and mentions the limitations of Angle-Resolved Photoemission Spectroscopy (ARPES) due to the small channel length of approximately 5 µm. Additionally, Band Edge Absorption Spectroscopy is proposed as an alternative method, highlighting its effectiveness in demonstrating sharper absorption curves characteristic of direct band gap semiconductors.

PREREQUISITES
  • Understanding of Photoluminescence (PL) measurements
  • Familiarity with Band Edge Absorption Spectroscopy techniques
  • Knowledge of Transition Metal Dichalcogenides (TMDs)
  • Experience with the scotch tape method for material exfoliation
NEXT STEPS
  • Research advanced techniques for measuring band gap properties in TMDs
  • Explore the principles and applications of Band Edge Absorption Spectroscopy
  • Investigate alternative methods to ARPES for small-scale samples
  • Learn about the implications of direct vs. indirect band gap semiconductors in applications
USEFUL FOR

Researchers, material scientists, and experimental physicists focused on semiconductor properties, particularly those working with Transition Metal Dichalcogenides and optical measurement techniques.

hasniali
Messages
9
Reaction score
0
Hi,
How can I prove direct band gap property of a Transition Metal Dichalcogenide electrically and optically through experimentation? I can use PL measurements to prove this for optical band gap. Is there any other equipment or technique to prove this? I can not use ARPES because channel length is around 5 um. I think ARPES requires larger films. I am using scotch tape method for exfoliation. Any help in this regard is highly appreciated. Thank you.
 
Another way is Band edge absorption spectroscopy. Absorption curve is much sharper for direct band semiconductors.
See this:

https://www.researchgate.net/post/How_can_you_know_the_material_is_of_direct_band_gap_or_indirect_bandgap
 
Last edited by a moderator:

Similar threads

Graduate Does direct/indirect band gap occur in solids other than semiconductors?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Anisotropy of the effective masses in semiconductors
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Relationship between the depletion region and the band gap of a diode?
  • · Replies 3 ·
Replies
3
Views
6K
Undergrad Band Gap of Semiconductor Materials
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Why is the band offset of an LED equal to the band gap?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Criticality, phase transitions and closing bandgap
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Explore Properties of Semiconductors for CdS: Band Gap, Effective Mass & More
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Why doesn't Graphene have a band gap?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate How Can dI/dV Help Determine Fermi Level and Band Gap in Semiconductors?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Band gap calculation,how to choose the Kpoints?
  • · Replies 4 ·
Replies
4
Views
4K