Evaluation of spectrum-splitting dichroic mirrors for PV mirror tandem solar cells

Zhengshan Yu, Kathryn C. Fisher, Zachary Holman

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

12 Scopus citations


Single-junction solar cells are approaching their theoretical efficiency limit, and tandem or multi-junction architectures provide a route for further increasing efficiency. However, due to high material cost, these technologies have traditionally been restricted to high concentrations with the penalty of the loss of diffuse light in outdoor applications. We propose a new tandem concept called a PVMirror that makes use of the global spectrum. It utilizes PV cells as a three-in-one technology-they act as a concentrating mirror, spectrum splitter, and high-efficiency light-to-electricity converter. A key element of this technology is an effective spectrum-splitting dichroic mirror, and this paper evaluates three dichroic mirror designs. Prototype PVMirrors with these mirrors and silicon heterojunction solar cells were made, and their reflection and transmission spectra confirm the spectrum-splitting capability of the dichroic mirrors. Outdoor testing shows that reflected light is successfully concentrated to a focus at which the second sub-cell in the tandem is to be located.

Original languageEnglish (US)
Title of host publication2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479979448
StatePublished - Dec 14 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: Jun 14 2015Jun 19 2015


Other42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans


  • dichroic mirror
  • multi-junction
  • photovoltaic cell
  • silicon
  • Solar cell
  • spectrum-splitting
  • tandem

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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