Creating Magnetic Plasmons at Visible Frequencies: Towards Isotropic Negative Index Metamaterials
Abstract
Multi-excitonic process that up- or downconvert photons can be used to surpass the Shockley-Queisser limit. It would be ideal to use molecules and semiconductor nanocrystals (NCs) for this purpose. As a practical matter, both these two classes of materials are generally earth-abundant, have high absorption coefficients and can potentially be deposited via a roll to roll printing process to fabricate inexpensive flexible optoelectronic devices. In order to promote exciton splitting and charge collection, it is strategic to focus on spin triplet excitons. The microsecond lifetime in spin-triplet excitons may allow diffusion to compete with recombination, e.g. in bulk heterojunctions. Indeed, in the past four years, since the pioneering reports of Baldo and Bawendi, Rao and Friend, a number of reports have focused on spin triplet exciton transport from molecules to NCs and in the reverse direction. The goal has been to design semiconductor NCs as triplet photosensitizers for photon upconversion.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 08, 2018
- Accession Number
- AD1068172
Entities
People
- Ming L. Tang
Organizations
- University of California, Riverside