Absorption Enhancement in InGaAsP/InGaP Quantum Well Solar Cells

Myles Steiner, John Geisz, Salah Bedair

Research output: Contribution to conferencePaper


InGaAsP/InGaP quantum well (QW) structure is a potential candidate for subcells in next-generation multijunction solar cells because of its tunable bandgap (1.5-1.8 eV). However, the insufficient light absorption in the QWs has previously limited the sub-bandgap quantum efficiency (QE) to less than 25%. We report on the development of InGaAsP/InGaP superlattice solar cell with improved sub-bandgap QE exceeding 75% and bandgap-voltage offset of 0.40 V. The enhancements were accomplished by reducing the background doping in the QW region, monitoring the stress evolution during growth, modifying the QW design to grow thicker wells and processing the devices with optical reflector to enhance light absorption.
Original languageAmerican English
Number of pages6
StatePublished - 2018
Event2017 IEEE 44th Photovoltaic Specialist Conference (PVSC) - Washington, D.C.
Duration: 25 Jun 201730 Jun 2017


Conference2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)
CityWashington, D.C.

NREL Publication Number

  • NREL/CP-5900-68863


  • bandgap engineering
  • III-V
  • InGaAs
  • InGaP
  • quantum wells
  • solar cells


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