Optical and Quantum Electronics

, Volume 41, Issue 8, pp 605–612

Optimum design of InGaP/GaAs dual-junction solar cells with different tunnel diodes

Article

DOI: 10.1007/s11082-010-9367-1

Cite this article as:
Leem, J.W., Lee, Y.T. & Yu, J.S. Opt Quant Electron (2009) 41: 605. doi:10.1007/s11082-010-9367-1

Abstract

We design the InGaP/GaAs dual-junction (DJ) solar cells by optimizing short-circuit current matching between top and bottom cells using the Silvaco ATLAS. The relatively thicker base layer of top cell exhibits a larger short-circuit current density (Jsc) while the thicker base layer of bottom cell allows for a smaller Jsc. The matched Jsc of 10.61±0.05 and 13.25±0.06 mA/cm2 under AM1.5G and AM0 illuminations, respectively, are obtained, leading to the increased conversion efficiency. The base thicknesses of top InGaP cells are optimized at 0.8 and 0.65 μm for AM1.5G and AM0 illuminations, respectively, and the base thicknesses of bottom GaAs cells are optimized at 2 μm. For the optimized solar cell structure, the maximum Jsc = 10.66 mA/cm2 (13.31 mA/cm2), Voc =  2.34 V (2.35 V), and fill factor =  87.84% (88.1%) are obtained under AM1.5G (AM0) illumination, exhibiting a maximum conversion efficiency of 25.78% (23.96%). The effect of tunnel diode structure, i.e, GaAs/GaAs, AlGaAs/AlGaAs, and InGaP/InGaP, on the characteristics of solar cells is investigated. The photogeneration rate in the DJ solar cell structure is also obtained by incident light of different wavelengths.

Keywords

InGaP/GaAsSolar cellsDual junctionTunnel diodeShort-circuit current matching

Copyright information

© Springer Science+Business Media, LLC. 2010

Authors and Affiliations

  1. 1.Department of Electronics and Radio EngineeringKyung Hee UniversityYongin-siRepublic of Korea
  2. 2.Department of Information and CommunicationsGwangju Institute of Science and TechnologyGwangjuRepublic of Korea