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DOI	10.1039/c6ee03702j
	Enhanced sub-bandgap efficiency of a solid-state organic intermediate band solar cell using triplet-triplet annihilation
	Lin Y.L.; Koch M.; Brigeman A.N.; Freeman D.M.E.; Zhao L.; Bronstein H.; Giebink N.C.; Scholes G.D.; Rand B.P.
发表日期	2017
ISSN	17545692
起始页码	1465
结束页码	1475
卷号	10 期号:6
英文摘要	Conventional solar cells absorb photons with energy above the bandgap of the active layer while sub-bandgap photons are unharvested. One way to overcome this loss is to capture the low energy light in the triplet state of a molecule capable of undergoing triplet-triplet annihilation (TTA), which pools the energy of two triplet states into one high energy singlet state that can then be utilized. This mechanism underlies the function of an organic intermediate band solar cell (IBSC). Here, we report a solid-state organic IBSC that shows enhanced photocurrent derived from TTA that converts sub-bandgap light into charge carriers. Femtosecond resolution transient absorption spectroscopy and delayed fluorescence spectroscopy provide evidence for the triplet sensitization and upconversion mechanisms, while external quantum efficiency measurements in the presence of a broadband background light demonstrate that sub-bandgap performance enhancements are achievable in this device. The solid-state architecture introduced in this work serves as an alternative to previously demonstrated solution-based IBSCs, and is a compelling model for future research efforts in this area. © The Royal Society of Chemistry 2017.
英文关键词	Absorption spectroscopy; Energy gap; Fluorescence; Fluorescence spectroscopy; Light; Photons; External quantum efficiency; Femto-second resolution; Performance enhancements; Solid-state architectures; Transient absorption spectroscopies; Triplet sensitization; Triplet-triplet annihilation; Upconversion mechanisms; Solar cells; active layer; atomic absorption spectroscopy; fluorescence spectroscopy; fuel cell; quantum mechanics; solar power
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190469
作者单位	Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States; Department of Chemistry, Princeton University, Princeton, NJ 08544, United States; Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, United States; Department of Chemistry, University College London, London, WC1H 0AJ, United Kingdom; Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Lin Y.L.,Koch M.,Brigeman A.N.,et al. Enhanced sub-bandgap efficiency of a solid-state organic intermediate band solar cell using triplet-triplet annihilation[J],2017,10(6).
APA	Lin Y.L..,Koch M..,Brigeman A.N..,Freeman D.M.E..,Zhao L..,...&Rand B.P..(2017).Enhanced sub-bandgap efficiency of a solid-state organic intermediate band solar cell using triplet-triplet annihilation.Energy & Environmental Science,10(6).
MLA	Lin Y.L.,et al."Enhanced sub-bandgap efficiency of a solid-state organic intermediate band solar cell using triplet-triplet annihilation".Energy & Environmental Science 10.6(2017).