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Modeling of Λ-graded InxGa1−xN solar cells: comparison of strained and relaxed features

Modeling of Λ-graded InxGa1−xN solar cells: comparison of strained and relaxed features Abstract.The optical properties of Λ-graded indium gallium nitride (InGaN) solar cells are studied. Graded InGaN well structures with the indium composition increasing to xmax and then decreasing in a Λ-shaped pattern have been designed. Through polarization doping, this naturally creates alternating p- and n-type regions. Separate structures are designed by varying the indium alloy profile from GaN to maximum indium concentrations ranging from 20% to 90%, while maintaining a constant overall structure thickness of 100 nm. The solar cell parameters under fully strained and relaxed conditions are considered. The results show that a maximum efficiency of ≅5.5  %   under fully strained condition occurs for xmax  =  60  %  . Solar cell efficiency under relaxed conditions increases to a maximum of 8.3% for xmax  =  90  %  . Vegard’s law predicts the bandgap under relaxed conditions, whereas a Vegard-like law is empirically determined from the output of nextnano™ for varying indium compositions to calculate the solar cell parameters under strain. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Photonics for Energy SPIE

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Publisher
SPIE
Copyright
© 2022 Society of Photo-Optical Instrumentation Engineers (SPIE)
ISSN
1947-7988
eISSN
1947-7988
DOI
10.1117/1.jpe.12.022205
Publisher site
See Article on Publisher Site

Abstract

Abstract.The optical properties of Λ-graded indium gallium nitride (InGaN) solar cells are studied. Graded InGaN well structures with the indium composition increasing to xmax and then decreasing in a Λ-shaped pattern have been designed. Through polarization doping, this naturally creates alternating p- and n-type regions. Separate structures are designed by varying the indium alloy profile from GaN to maximum indium concentrations ranging from 20% to 90%, while maintaining a constant overall structure thickness of 100 nm. The solar cell parameters under fully strained and relaxed conditions are considered. The results show that a maximum efficiency of ≅5.5  %   under fully strained condition occurs for xmax  =  60  %  . Solar cell efficiency under relaxed conditions increases to a maximum of 8.3% for xmax  =  90  %  . Vegard’s law predicts the bandgap under relaxed conditions, whereas a Vegard-like law is empirically determined from the output of nextnano™ for varying indium compositions to calculate the solar cell parameters under strain.

Journal

Journal of Photonics for EnergySPIE

Published: Apr 1, 2022

Keywords: optical properties; polarization doping; graded structure; solar cell; InGaN

References