Full Content is available to subscribers

Subscribe/Learn More  >
Proceedings Article

43.5% efficient lattice matched solar cells

[+] Author Affiliations
Michael Wiemer, Vijit Sabnis, Homan Yuen

Solar Junction (USA)

Proc. SPIE 8108, High and Low Concentrator Systems for Solar Electric Applications VI, 810804 (September 19, 2011); doi:10.1117/12.897769
Text Size: A A A
From Conference Volume 8108

  • High and Low Concentrator Systems for Solar Electric Applications VI
  • Kaitlyn VanSant; Raed A. Sherif
  • San Diego, California | August 21, 2011

abstract

The most common triple-junction solar cell design which has been commercially available to date utilizes a germanium bottom cell with an (In)GaAs and InGaP middle and top cell respectively. This type of device has a well-known efficiency limitation somewhere around 40% at 500 suns. Higher efficiencies can be obtained by changing the effective bandgaps of the three junctions, but the choice of materials and approaches to do so is very limited. We at Solar Junction have adopted the dilute nitride material system to obtain these new bandgaps, and break through the 40% efficiency barrier. The unique advantage of the dilute nitrides is that the bandgap and lattice constant can be tuned independently, allowing bulk material lattice matched to Germanium or GaAs over a wide range of bandgaps. The dilute nitride technology in our first commercial product has enabled us to maximize the efficiency of a triple junction solar cell by using the optimal set of bandgaps (including one around 1eV). Commercial Solar Junction concentrator cells with efficiencies of 43.5% have been independently verified by NREL and Fraunhofer. These higher efficiencies are generally the result of higher output voltage, not higher current, which keeps system-level resistive wiring losses in check.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Michael Wiemer ; Vijit Sabnis and Homan Yuen
"43.5% efficient lattice matched solar cells", Proc. SPIE 8108, High and Low Concentrator Systems for Solar Electric Applications VI, 810804 (September 19, 2011); doi:10.1117/12.897769; http://dx.doi.org/10.1117/12.897769


Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).

Figures

Tables

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Proceeding
Sign in or Create a personal account to Buy this proceeding ($15 for members, $18 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.