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Harnessing molecular photon upconversion at sub-solar irradiance using dual sensitized self-assembled trilayers

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Abstract

Photon upconversion via triplet–triplet annihilation (TTA-UC) is an intriguing strategy to potentially increase maximum solar cell efficiencies from 33% to greater than 43%. TTA-UC has been incorporated into a dye-sensitized solar cell (DSSC) but the low solar energy conversion efficiency can be attributed, at least in part, to the relatively narrow absorption features of the sensitizer molecule. Here we incorporate multiple sensitizers into a TTA-UC DSSC using bilayer and trilayer self-assembly via metal ion linkages. The sensitizers' complementary absorption features increase broad-band light absorption and work cooperatively to achieve peak TTA-UC efficiency at sub-solar irradiance (<1 sun or <100 mW cm−2). The trilayer DSSC, with high sensitizer density and directional energy transfer cascade towards the charge seperation interface, exhibited the highest efficiency yet reported for harvesting low energy light in an integrated TTA-UC solar cell (1.2 × 10−3%).

Graphical abstract: Harnessing molecular photon upconversion at sub-solar irradiance using dual sensitized self-assembled trilayers

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Publication details

The article was received on 10 Jan 2017, accepted on 08 Mar 2017, published on 09 Mar 2017 and first published online on 09 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00317J
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Harnessing molecular photon upconversion at sub-solar irradiance using dual sensitized self-assembled trilayers

    T. Dilbeck, S. P. Hill and K. Hanson, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00317J

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