Numerical Analysis on Polarization-Induced Doping III-Nitride n-i-p Solar Cells
| Autor: | Yung Chi Yao, Ya Ju Lee, Zu Po Yang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
lcsh:Applied optics. Photonics
Materials science business.industry Energy conversion efficiency Doping chemistry.chemical_element Polarization-induced doping lcsh:TA1501-1820 n-i-p solar cells Nitride wurtzite structure Molecular physics III-nitride Atomic and Molecular Physics and Optics chemistry Electric field Ionization Optoelectronics lcsh:QC350-467 Electrical and Electronic Engineering Electronic band structure business Indium lcsh:Optics. Light Wurtzite crystal structure |
| Zdroj: | IEEE Photonics Journal, Vol 7, Iss 1, Pp 1-9 (2015) |
| ISSN: | 1943-0655 |
| Popis: | We design and numerically evaluate a new type of III-nitride n-i-p solar cells whose p- and n-type regions with equal carrier concentration of 3×10 18 cm -3 are not generated by extrinsic impurity doping but by the so-called polarization-induced doping, which is induced by the graded In x Ga 1-x N layers of linearly increasing (from x=0% to 30%) and decreasing (from x=30% to 0%) the indium composition to construct the conductive p- and n-type regions, respectively. Because of the identical and uniform polarization charges within each unit cell, a smooth spatial variation of potential profile of the device is hence expected, which mitigates the energy band discontinuities at hetero-interfaces, and facilitates transportation and collection of photogenerated carriers with high efficiency. Most importantly, as the conductive n- and p-type regions are formed by electrostatic field ionization but not by the thermal activation, the concentration of field-induced carriers is independent of thermal freezeout effects. Thus the polarization-induced doping III-nitride n-i-p solar cells can provide stable power conversion efficiency, even when operated at low temperatures. Index Terms: Polarization-induced doping, III-nitride, n-i-p solar cells, wurtzite structure. |
| Databáze: | OpenAIRE |
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