Journal
JOURNAL OF APPLIED PHYSICS
Volume 109, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3592297
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Funding
- U.S. Department of Energy, Basic Energy Sciences Energy Frontier Research Center (DoE-LMI-EFRC) [DOE DE-AC02-05CH11231]
- National Science Foundation Nano-Scale Science and Engineering Center (NSF-NSEC) [CMMI- 0751621]
- National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0751621] Funding Source: National Science Foundation
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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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592297]
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