Impact of Stokes Shift on the Performance of Near-Infrared Harvesting Transparent Luminescent Solar Concentrators
| Autor: | Richard R. Lunt, Wei Sheng, Dianyi Liu, Margaret Young, Jun Zhang, Wei-Tao Peng, Babak Borhan, Matthew R. Donahue, Benjamin G. Levine, Chenchen Yang, Padmanaban S. Kuttipillai |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Work (thermodynamics)
Materials science lcsh:Medicine 02 engineering and technology Orbital overlap 010402 general chemistry 01 natural sciences Article symbols.namesake Stokes shift Emission spectrum Absorption (electromagnetic radiation) lcsh:Science Multidisciplinary business.industry Near-infrared spectroscopy Energy conversion efficiency lcsh:R 021001 nanoscience & nanotechnology 0104 chemical sciences Scalability symbols Optoelectronics lcsh:Q 0210 nano-technology business |
| Zdroj: | Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-10 (2018) |
| ISSN: | 2045-2322 |
| Popis: | Visibly transparent luminescent solar concentrators (TLSC) have the potential to turn existing infrastructures into net-zero-energy buildings. However, the reabsorption loss currently limits the device performance and scalability. This loss is typically defined by the Stokes shift between the absorption and emission spectra of luminophores. In this work, the Stokes shifts (SS) of near-infrared selective-harvesting cyanines are altered by substitution of the central methine carbon with dialkylamines. We demonstrate varying SS with values over 80 nm and ideal infrared-visible absorption cutoffs. The corresponding TLSC with such modification shows a power conversion efficiency (PCE) of 0.4% for a >25 cm2 device area with excellent visible transparency >80% and up to 0.6% PCE over smaller areas. However, experiments and simulations show that it is not the Stokes shift that is critical, but the total degree of overlap that depends on the shape of the absorption tails. We show with a series of SS-modulated cyanine dyes that the SS is not necessarily correlated to improvements in performance or scalability. Accordingly, we define a new parameter, the overlap integral, to sensitively correlate reabsorption losses in any LSC. In deriving this parameter, new approaches to improve the scalability and performance are discussed to fully optimize TLSC designs to enhance commercialization efforts. |
| Databáze: | OpenAIRE |
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