optical processes in semiconductors: review a. aydınlı
Post on 21-Dec-2015
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![Page 1: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/1.jpg)
Optical Processes in Semiconductors: Review
A. Aydınlı
![Page 2: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/2.jpg)
PL Emission of optical radiation
resulting from excitation to a nonequilibrium state by irradiation with light. Create electron-hole pairs by
absorption of exciting light Radiative recombination of electron-
hole pairs Escape of recombination radiation from
the sample.
![Page 3: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/3.jpg)
PL
Sensitive (compared to absorption) Nondestructive Simple to perform Considerable analysis may be
required to reach the physical mechanism
![Page 4: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/4.jpg)
Electron-Photon Interaction
Solve:
To obtain:
)()(2
1 2
0
rVeApm
H
0
22
00
2
2)(
2)(
2 m
AepAAp
m
erV
m
pH
)()(2 2'
ababs EEarHbW
pAm
eH
0
')(
2 0
2
rVm
pH
![Page 5: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/5.jpg)
Fermi’s Golden Rule Interaction energy between the radiation field
and atomic system can be written either
222 )2/()/( jj
j AmcepAmceH
jj reEHor
![Page 6: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/6.jpg)
Absorption/Emission
![Page 7: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/7.jpg)
DOS
![Page 8: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/8.jpg)
Transitions in Bulk
![Page 9: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/9.jpg)
Emission vs Gain
![Page 10: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/10.jpg)
Direct Gap Absorption
![Page 11: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/11.jpg)
Direct Gap Absorption
![Page 12: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/12.jpg)
Absorption in QW
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Population Inversion in a QW
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Intersubband Absorption
![Page 15: Optical Processes in Semiconductors: Review A. Aydınlı](https://reader036.vdocuments.us/reader036/viewer/2022062421/56649d595503460f94a388ac/html5/thumbnails/15.jpg)
Intersubband Absorption
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Inter- and intraimpurity Transitions
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Free-bound:
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Band-band:
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Degeneracy: