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Numerical Simulation of Single-Junction In _{0.5} Ga _{0.5} P Solar Cell With Compositional Grading Configuration

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4 Author(s)
Yen-Kuang Kuo ; Dept. of Phys., Nat. Changhua Univ. of Educ., Changhua, Taiwan ; Bing-Cheng Lin ; Jih-Yuan Chang ; Yi-An Chang

A compositional grading layer between the p-In0.5Ga0.5P emitter layer and p-In0.5Al0.5P window layer in the p+-n In0.5Ga0.5P solar cell is investigated numerically. With the insertion of the grading layer, the short-circuit current density and conversion efficiency are improved due to the enhancement of carrier-collection efficiency, which can be ascribed to the reduction of potential barrier height in the valance band and the existence of internal quasi-electric field in the conduction band. An optimized value of conversion efficiency can be obtained by appropriately adjusting the thickness of the grading layer.

Published in:

Photonics Technology Letters, IEEE  (Volume:23 ,  Issue: 12 )