In situ growth monitoring of strain-balanced quantum-well solar cells by metal-organic vapor phase epitaxy

Masakazu Sugiyama, Yunpeng Wang, Momoko Deura, Ryusuke Onitsuka, Yoshiaki Nakano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In situ monitoring of surface reflectivity and reflectance anisotropy (RA) was examined as a monitor of strain during the metal-organic vapor phase epitaxy (MOVPE) of strain-balanced InGaAs/GaAsP quantum-well stacks, aiming at a middle cell that improves current matching in tandem solar cells. The RA, which is in principle sensitive only to the topmost surface of the crystal, changed linearly with time during the growth of InGaAs and GaAsP with opposite slopes according to the layers. This behavior seems to reflect the accumulation of strain with the growth of InGaAs layer and its release during the growth of GaAsP layer, allowing us to manage strain balance in the stacking of quantum wells based on in situ observation. Such strain balance enabled 100 stacks of InGaAs/GaAsP quantum wells without threading dislocations. The GaAs pin junction with the strain-balanced quantum wells in the i layer exhibited the absorption edge at 1.2 eV.

Original languageEnglish
Title of host publication2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009
Pages1879-1882
Number of pages4
DOIs
Publication statusPublished - 2009 Dec 1
Event2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009 - Philadelphia, PA
Duration: 2009 Jun 72009 Jun 12

Other

Other2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009
CityPhiladelphia, PA
Period09/6/709/6/12

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'In situ growth monitoring of strain-balanced quantum-well solar cells by metal-organic vapor phase epitaxy'. Together they form a unique fingerprint.

  • Cite this

    Sugiyama, M., Wang, Y., Deura, M., Onitsuka, R., & Nakano, Y. (2009). In situ growth monitoring of strain-balanced quantum-well solar cells by metal-organic vapor phase epitaxy. In 2009 34th IEEE Photovoltaic Specialists Conference, PVSC 2009 (pp. 1879-1882). [5411553] https://doi.org/10.1109/PVSC.2009.5411553