Harnessing molecular photon upconversion at sub-solar irradiance using dual sensitized self-assembled trilayers. Issue 23 (15th March 2017)

• Record Type: Journal Article
• Authors: Dilbeck, Tristan; Hill, Sean P.; Hanson, Kenneth
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 23(2017)
• Page Start: 11652
• Page End: 11660
• Publication Date: 2017-03-15
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta00317j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Self-assembled trilayers on metal oxide surfaces are used to increase absorption cross section and photocurrent generation efficiency via triplet–triplet annihilation. 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 %).