期刊
ACS ENERGY LETTERS
卷 1, 期 1, 页码 3-8出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00001
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- Florida State University's Energy and Materials Initiative
Molecular photon upconversion, by way of triplet-triplet annihilation (TTA-UC), is an intriguing strategy to increase solar cell efficiencies beyond the Shockley-Queisser limit. Here we introduce self-assembled bilayers of acceptor and sensitizer molecules on high surface area electrodes as a means of generating an integrated TTA-UC dye-sensitized solar cell. Intensity dependence and IPCE measurements indicate that bilayer films effectively generate photo current by two different mechanisms: (1) direct excitation and electron injection from the acceptor molecule and (2) low-energy light absorption by the sensitizer molecule followed by TTA-UC and electron injection from the upconverted state. The power conversion efficiency from the upconverted photons is the highest yet reported for an integrated TTA-UC solar cell. Energy transfer and photocurrent generation efficiency of the bilayer device is also directly compared to the previously reported heterogeneous UC scheme.
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