Accession Number:

ADA624608

Title:

Solar Energy Enhancement Using Down-converting Particles: A Rigorous Approach

Descriptive Note:

Journal article

Corporate Author:

CALIFORNIA UNIV BERKELEY

Personal Author(s):

Report Date:

2011-06-06

Pagination or Media Count:

10.0

Abstract:

The efficiency of a single band-gap solar cell is specified by the Shockley-Queisser limit, which defines the maximal output power as a function of the solar cell s band-gap. One way to overcome this limit is by using a down-conversion process whereupon a high energy photon is split into two lower energy photons, thereby increasing the current of the cell. Here, we provide a full analysis of the possible efficiency increase when placing a down-converting material on top of a pre-existing solar cell. We show that a total 7 efficiency improvement is possible for a perfectly efficient down-converting material. Our analysis covers both lossless and lossy theoretical limits, as well as a thermodynamic evaluation. Finally, we describe the advantages of nanoparticles as a possible choice for a down-converting material.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electric Power Production and Distribution
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE