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23 May 2011
Parameters for GaAs
I just wondering the parameters or the refernce for calculation of GaAs in Schred.
Including the orientation, degenerate number, effective quantum mass, effective density of state mass, etc.
23 May 2011
I assume you are asking for the simulation using Schred V2.0
The following are the parameters for the QM simulation of GaAs for that tool:
Transport orientation =
width orientation =
confinement orientation =
Gamma valley eff. mass (mx=my=mz) = 0.06574
L valley eff. mass: mx= 1.72750 ; my= 0.09671; mz=0.09671
X valley eff.mass: mx=1.88076; my=0.17525; mz=0.17525
Heavy hole eff. mass (same for all 3 valleys) = 0.51
Light hole eff. mass (same for all 3 valleys)= 0.082
valley offset : Gamma = 0 ; L-valley = 0.29; X-valley=0.48
valley degeneracy: Gamma = 1.0; L-valley = 4.0; X-valley = 3.0
Do not worry about the eff. DOS mass etc, they are calculated in the program using the principal effective masses of the three valleys.
Hope this helps,
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15 Jun 2011
1.Is mz for L/X valley the mass along 111/100 direction?- the directions mentioned in the simulator are the device directions (transport/width/confinement orientation etc), the orientation that you have mentioned are the ellipsoidal(/crystallographic) directions for each of the valleys.
2.Why is not the degenerate number for L valley 8 instead of 4? Why is not the degenerate number for X valley 6 instead of 3?- we consider valley pairs, hence the degeneracy by 2
3.In your reply “Heavy hole eff. mass (same for all 3 valleys) = 0.51”, should it be “same for 3 subbands”. If it’s not, may I beg for the reason.- yes Schred takes the same hole effective mass, to calculate the valence band DOS- used to calculate the final carrier concentration.
4.Is 0.51/0.082 the quantized mass for heavy/light hole? What is the mass of density of mass for them?- It is the effective mass for the bulk GaAs – HH & LH valence bands.
5.Does Schred consider bandgap narrowing when temperature or doping concentration change?-No, it does not consider BGN.
6.By the way, can you recommand some good reference for GaAs.I find very less information about subband calculation of GsAs, so I bother you for many questions. Thank you!- Yang, T., et al. “Inversion Capacitance-Voltage Studies on GaAs Metal-Oxide-Semiconductor Structure using Transparent Conducting Oxide as Metal Gate.” Applied Physics Letters 92 (2008): 252105, I used this to compare my results with, you can check their parameters for their simulation.
hope this helps!
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