期刊
JACS AU
卷 1, 期 4, 页码 409-426出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacsau.1c00045
关键词
transparent photovoltaic (TPV); dye-sensitized solar cells (DSSC); near-infrared sensitizers; cyanine dyes; time-resolved spectroscopies; high color rendering index TPV
资金
- Agence National de la Recherche (ANR) [ANR-17-CE05-0037]
- European Union's Horizon2020 research and innovation program [826013]
- ANR Labex NIE [ANR-11-LABX-0058_NIE]
- French Ministry of Recherche
This study focuses on developing a transparent solar cell with high efficiency and colorlessness by optimizing visible light absorption. By optimizing the structure of the near-infrared sensitizer, efficient energy conversion of the solar cell is achieved while maintaining transparency and colorlessness.
Most photovoltaic (PV) technologies are opaque to maximize visible light absorption. However, see-through solar cells open additional perspectives for PV integration. Looking beyond maximizing visible light harvesting, this work considers the human eye photopic response to optimize a selective near-infrared sensitizer based on a polymethine cyanine structure (VG20-C-x) to render dye-sensitized solar cells (DSSCs) fully transparent and colorless. This peculiarity was achieved by conferring to the dye the ability to strongly and sharply absorb beyond 800 nm (S-0-S-1 transition) while rejecting the upper S-0-S-n contributions far in the blue where the human retina is poorly sensitive. When associated with an aggregation-free anatase TiO2 photoanode, the selective NIR-DSSC can display 3.1% power conversion efficiency, up to 76% average visible transmittance (AVT), a value approaching the 78% AVT value of a standard double glazing window while reaching a color rendering index (CRI) of 92.1%. The ultrafast and fast charge transfer processes are herein discussed, clarifying the different relaxation channels from the dye monomer excited states and highlighting the limiting steps to provide future directions to enhance the performances of this nonintrusive NIR-DSSC technology.
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