Numerical Analysis on Polarization-Induced Doping III-Nitride n-i-p Solar Cells

Ya Ju Lee, Yung Chi Yao, Zu Po Yang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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 × 1018 cm-3 are not generated by extrinsic impurity doping but by the so-called polarization-induced doping, which is induced by the graded InxGa1-xN layers of linearly increasing (from x = 0% to 30%) and decreasing (from x = 30% to 0%) 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 the potential profile of the device is, hence, expected, which mitigates the energy band discontinuities at heterointerfaces 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 freeze-out 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.

Original languageEnglish
Article number2300108
JournalIEEE Photonics Journal
Volume7
Issue number1
DOIs
Publication statusPublished - 2015 Feb 1

Fingerprint

Nitrides
numerical analysis
nitrides
Numerical analysis
Solar cells
solar cells
Doping (additives)
Polarization
polarization
Band structure
Indium
Conversion efficiency
Ionization
Carrier concentration
energy bands
indium
discontinuity
Chemical activation
Electric fields
activation

Keywords

  • III-nitride
  • Polarization-induced doping
  • n-i-p solar cells
  • wurtzite structure

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Numerical Analysis on Polarization-Induced Doping III-Nitride n-i-p Solar Cells. / Lee, Ya Ju; Yao, Yung Chi; Yang, Zu Po.

In: IEEE Photonics Journal, Vol. 7, No. 1, 2300108, 01.02.2015.

Research output: Contribution to journalArticle

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