working principle of a semiconductor based solar...
TRANSCRIPT
Arno Smets
Working Principle of a Semiconductor Based Solar CellBand Gap I - Electrons in Atoms
Week 2.2.1
Hydrogen
Proton (+)
Electron (-)
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
- electron
proton
+
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
- electron
proton
+
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
- electron
proton
+
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
- electron
proton
+
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
- electron
proton
+
How strong are electrons bonded: the H atom
1s
2s
3s
2p
3p
Ground state
Ener
gy
2s
3s
1s
2p
3p
X Y Z
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Electron spin
How strong are electrons bonded:
1s
2s
3s
2p
3p
Ener
gy
Pauli principle: two identical electrons can not occupy the same quantum state simultaneously.
Pauli’s Exclusion Principle:
1s
2s
3s
2p
3p
Ener
gy
Pauli principle: two identical electrons can not occupy the same quantum state simultaneously.
How strong are electrons bonded:
1s
2s
3s
2p
3p
Ener
gy
Pauli principle: two identical electrons can not occupy the same quantum state simultaneously.
Helium
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
He 1s2
Lithium
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Li 1s22s1
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Be 1s22s2
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
B 1s22s22p1
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
C 1s22s22p2
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
N 1s22s22p3
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
B 1s22s22p4
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
B 1s22s22p5
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Ne 1s22s22p6
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Na 1s22s22p63s1
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Mg 1s22s22p63s2
How strong are electrons bonded
1s
2s
3s
2p
3p
Ener
gy
Al 1s22s22p63s23p1
How strong are electrons bonded: the Si atom
1s
2s
3s
2p
3p
Ener
gy
Si 1s22s22p63s23p2
Bonding of electrons in Si network
1s
2s
3s
2p
3p
Ener
gy
Si atom: 14 electrons
Bonding of electrons in Si network
3s
3p