Lecture contents. Stress and strain Deformation potential. NNSE 618 Lecture #23

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1 1 Lecture contents Stress and strain Deformation potential

2 Few concepts from linear elasticity theory : Stress and Strain 6 independent components 2 Stress = force/area ( 3x3 symmetric tensor! ) ij ji Stresses applied to a infinitely small volume: Strain = Ddisplacement/ Dcoordinate ( 3x3 symmetric tensor! ) ij 1 u 2 x i j u x i j Diagonal (axial) strain components: ii u x i i 6 independent components Explanation of shear strain components:

3 Few concepts from linear elasticity theory : Hooke s law 3 Stress-Strain relation: extension of Hooke s law (linear regime): Due to symmetry of stress-strain tensors the matrix of elastic moduli (elastic stiffness constants) can be reduced to 6x6: 2 Note: components ij ij for non-diagonal strain For cubic crystals, only 3 constants are independent:

4 Effects of crystal symmetry on elastic constants 4

5 Definitions for other elastic constants For cubic crystal (3 constants are independent) : 5 Anisotropy ratio A c 2c c 12 For isotropic material, A=1, only two elastic constants are independent 2c c c Lamé coefficient l and shear modulus m : Fractional change of crystal volume under uniform deformation From Singh, 2003

6 Definitions of other elastic constants 6 Young's modulus Poisson ratio Shear modulus Lamé coefficient Bulk modulus 3l 2m B 2 Another useful set of equations for isotropic material (only 2 constants are independent) :

7 Strain in heterostructures 7 Lattice mismatch: Strain relaxed: Strain: NNSE 618 Ref: Lecture Singh #23

8 Stress in pseudomorphic epitaxial films On arbitrary growth planes 8 Biaxial strain. No stress along the growth direction! For strained growth on (001) substrate & fcc lattice For strained growth on (111) substrate & fcc lattice (xyz s are along the cube axes) Ref: Singh

9 Strained tensor for self-organized quantum dots 9 Ref: Singh

10 Energy levels of Si as a function of interatomic spacing 10 Energy band shift vs. strain: Deformation potential Interatomic spacing

11 Deformation potential 11 Once the strain ij is known, the effects of strain on various band states (a) can be calculated using Deformation potential theory: H a ij a D ij a Number of independent non-zero D ij depends on symmetry of the state a Tensile strain in sp 3 bonded semiconductors reduces bandgap; compressive increases bandgap. Axial strain splits the valence band: strain effect on heavy holes is less ij Effect of strain on direct band-edges 0 0 Light holes Heavy holes Axial strain lifts degeneracy of indirect conduction band valleys and reduce the electron effective masses Strain induces piezoelectric field in polar semiconductor structures From Singh, 2003 Values of D s are usually of the order of few ev

12 Deformation potential 12 From Yu and Cordona, 2003 Volume DP for the bandgap

13 Strained Si 1-x Ge x / Si 13 Effect of strain on indirect band-edges H a ij a D ij ij a D ij From Singh, 2003 Biaxial compressive strain causes: Strong lowering of 4-fold in-plane valleys Weak lowering of 2-fold out-of plane valleys Reduction of masses and density of states

14 Strained heterostructures are usually grown in a form of quantum-confined structures to prevent plastic relaxation Strained quantum wells 100 Å QW valence band dispersion in AlGaAs/GaAs AlGaAs/In 0.1 Ga 0.9 As 14 Both quantum confinement and stress should be considered The strain bandgap energy shift for QWs can be over 100 mev larger than quantum confinement energies Strain reduces hole effective masses due to the splitting of LH and HH Tensile strain can compensate quantum confinement energy and restore degeneracy of the valence band Effect of biaxial strain on hole masses Effect of biaxial tensile strain and quantum confinement on band edges From Singh, 2003

15 Self-assembled quantum dots 15 Band diagram for InAs QD in GaAs The highest elastic stain can be obtained in all-epitaxial self-assembled QDs Example: InAs bandgap = 0.35 ev The bandgap of strained InAs with a GaAs lattice parameter =1.09 ev The strain bandgap energy shift for InAs QD can be over 740 mev! much larger than quantum confinement energies From Singh, 2003

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