Multijunction solar cells with subcell materials highly lattice-mismatched to germanium

D. C. Law, C. M. Fetzer, Richard King, P. C. Colter, H. Yoon, T. D. Isshiki, K. M. Edmondson, M. Haddad, N. H. Karam

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

9 Citations (Scopus)

Abstract

The performance of a series of metamorphic GalnP and GalnAs solar cells grown on Ge with lattice-mismatch ranging from 0% to 2.4% is reported, with emphasis on device structures with 0.5% and 1.6% mismatch. Dualjunction cells with moderately lattice-mismatched (0.2% and 0.5%) structures have already reached electrical performance comparable to lattice-matched devices, at about 26% efficiency under AM0, 1-sun condition. Development efforts to date on highly lattice-mismatched (16% mismatch) structures have resulted in 22.6% efficiency dual-junction cells, with many improvements still possible. Spectral response measurements reveal excellent quantum efficiency (QE) for metamorphic GalnP and GalnAs materials, with a measured internal QE of over 90%. The offsets between the bandgap voltage (Eg/q) and the open-circuit voltage (Voc) of GalnP and GalnAs metamorphic cells were kept below 550 mV and 450 mV, respectively. Experimental results indicate that lattice-mismatched GalnP/GalnAs dual-junction cells can achieve higher energy conversion efficiency than latticematched GalnP/GalnAs dual-junction solar cells.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
Pages575-578
Number of pages4
StatePublished - 2005
Externally publishedYes
Event31st IEEE Photovoltaic Specialists Conference - 2005 - Lake Buena Vista, FL, United States
Duration: Jan 3 2005Jan 7 2005

Other

Other31st IEEE Photovoltaic Specialists Conference - 2005
CountryUnited States
CityLake Buena Vista, FL
Period1/3/051/7/05

Fingerprint

Quantum efficiency
Germanium
germanium
Solar cells
solar cells
Lattice mismatch
Open circuit voltage
Energy conversion
Sun
Conversion efficiency
Energy gap
cells
quantum efficiency
Electric potential
energy conversion efficiency
open circuit voltage
spectral sensitivity
sun
Multi-junction solar cells
electric potential

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Control and Systems Engineering

Cite this

Law, D. C., Fetzer, C. M., King, R., Colter, P. C., Yoon, H., Isshiki, T. D., ... Karam, N. H. (2005). Multijunction solar cells with subcell materials highly lattice-mismatched to germanium. In Conference Record of the IEEE Photovoltaic Specialists Conference (pp. 575-578)

Multijunction solar cells with subcell materials highly lattice-mismatched to germanium. / Law, D. C.; Fetzer, C. M.; King, Richard; Colter, P. C.; Yoon, H.; Isshiki, T. D.; Edmondson, K. M.; Haddad, M.; Karam, N. H.

Conference Record of the IEEE Photovoltaic Specialists Conference. 2005. p. 575-578.

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

Law, DC, Fetzer, CM, King, R, Colter, PC, Yoon, H, Isshiki, TD, Edmondson, KM, Haddad, M & Karam, NH 2005, Multijunction solar cells with subcell materials highly lattice-mismatched to germanium. in Conference Record of the IEEE Photovoltaic Specialists Conference. pp. 575-578, 31st IEEE Photovoltaic Specialists Conference - 2005, Lake Buena Vista, FL, United States, 1/3/05.
Law DC, Fetzer CM, King R, Colter PC, Yoon H, Isshiki TD et al. Multijunction solar cells with subcell materials highly lattice-mismatched to germanium. In Conference Record of the IEEE Photovoltaic Specialists Conference. 2005. p. 575-578
Law, D. C. ; Fetzer, C. M. ; King, Richard ; Colter, P. C. ; Yoon, H. ; Isshiki, T. D. ; Edmondson, K. M. ; Haddad, M. ; Karam, N. H. / Multijunction solar cells with subcell materials highly lattice-mismatched to germanium. Conference Record of the IEEE Photovoltaic Specialists Conference. 2005. pp. 575-578
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AU - King, Richard

AU - Colter, P. C.

AU - Yoon, H.

AU - Isshiki, T. D.

AU - Edmondson, K. M.

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AU - Karam, N. H.

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