期刊
NATURE MATERIALS
卷 13, 期 1, 页码 63-68出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3807
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资金
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- Department of Energy, Laboratory Directed Research and Development [DE-AC02-76SF00515]
- BMBF [03IP602]
- BMBF within PVcomB [FKZ 03IS2151D]
- DFG [SPP 1355]
- EPSRC [EP/L026066/1] Funding Source: UKRI
carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowest energy emissive interfacial charge-transfer state (CT1) in the charge generation process. We measure the quantum yield and the electric field dependence of charge generation on excitation of the charge-transfer (CT) state manifold viaweakly allowed, low-energy optical transitions. For a wide range of photovoltaic devices based on polymer: fullerene, small-molecule:C-60 and polymer: polymer blends, our study reveals that the internal quantum efficiency (IQE) is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited. The best materials systems show an IQE higher than 90% without the need for excess electronic or vibrational energy.
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