scholarly journals Singlet fission in pentacene dimers

2015 ◽  
Vol 112 (17) ◽  
pp. 5325-5330 ◽  
Author(s):  
Johannes Zirzlmeier ◽  
Dan Lehnherr ◽  
Pedro B. Coto ◽  
Erin T. Chernick ◽  
Rubén Casillas ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Ground State ◽  
Room Temperature ◽  
Quantum Yields ◽  
Compelling Evidence ◽  
Singlet Fission ◽  
Conversion Efficiencies ◽  
Triplet Quantum Yields ◽  
Conversion Scheme

Singlet fission (SF) has the potential to supersede the traditional solar energy conversion scheme by means of boosting the photon-to-current conversion efficiencies beyond the 30% Shockley–Queisser limit. Here, we show unambiguous and compelling evidence for unprecedented intramolecular SF within regioisomeric pentacene dimers in room-temperature solutions, with observed triplet quantum yields reaching as high as 156 ± 5%. Whereas previous studies have shown that the collision of a photoexcited chromophore with a ground-state chromophore can give rise to SF, here we demonstrate that the proximity and sufficient coupling through bond or space in pentacene dimers is enough to induce intramolecular SF where two triplets are generated on one molecule.

Modulating the dynamics of Förster resonance energy transfer and singlet fission by variable molecular spacers

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23061-23068
Author(s):  
Johannes Zirzlmeier ◽  
Giulia Lavarda ◽  
Henrik Gotfredsen ◽  
Ilias Papadopoulos ◽  
Lan Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Energy ◽  
Energy Conversion ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Solar Energy Conversion ◽  
Forster Resonance Energy Transfer ◽  
Förster Resonance Energy Transfer ◽  
Singlet Fission ◽  
Förster Resonance

The synergy between panchromatic absorption and molecular singlet fission (SF) is exploited to optimize solar energy conversion.

scholarly journals Harvesting singlet fission for solar energy conversion via triplet energy transfer

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
John R. Tritsch ◽  
Wai-Lun Chan ◽  
Xiaoxi Wu ◽  
Nicholas R. Monahan ◽  
X-Y. Zhu
Keyword(s):  
Energy Transfer ◽  
Solar Energy ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Singlet Fission ◽  
Triplet Energy ◽  
Triplet Energy Transfer

scholarly journals Interfaces in metal halide perovskites probed by solid-state NMR spectroscopy

2021 ◽  
Author(s):  
Clayton J. Dahlman ◽  
Dominik J. Kubicki ◽  
G. N. Manjunatha Reddy
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solar Energy ◽  
Energy Conversion ◽  
Solid State Nmr ◽  
Light Harvesting ◽  
Metal Halide ◽  
Single Junction ◽  
Halide Perovskites ◽  
Conversion Efficiencies

Metal halide perovskites (MHPs) are promising light harvesting and emitting materials that have enabled solar energy conversion efficiencies of over 25% in solution-processed single-junction cells, and found applications in flexible...

Luminescence studies of copper(I)-containing [2]pseudorotaxanes

2011 ◽  
Vol 89 (2) ◽  
pp. 98-103 ◽  
Author(s):  
Breeze N. Briggs ◽  
Fabien Durola ◽  
David R. McMillin ◽  
Jean-Pierre Sauvage
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Ground State ◽  
Room Temperature ◽  
Molecular Machines ◽  
Quantum Yields ◽  
Stacking Interactions ◽  
Fluid Solution ◽  
The Core ◽  
Photoluminescence Studies

This report describes photoluminescence studies of copper-containing [2]pseudorotaxanes that mimic elements of functioning molecular machines. Excitation with visible light induces a formal oxidation of the metal center and simulates an actuation process. In all four [2]pseudorotaxanes studied, the ring ligand is the same, but the thread ligand is variable, namely 2,9-di(anisol-4-yl)-1,10-phenanthroline (dap), 6,6′-di(anisol-4-yl)-2,2′-bipyridine (o-dabipy), 5,5′-di(anisol-4-yl)-2,2′-bipyridine (m-dabipy), or 8,8′-di(anisol-4-yl)-3,3′-bi-isoquinoline (dabiiq). The absorbance bandshapes suggest that aryl substituents extending from the core ligands engage in stacking interactions and induce a partially flattened structure in the ground state. More severe flattening occurs in the excited state and precludes the observation of emission if inter-ligand steric forces do not limit the distortion. Thus, the [2]pseudorotaxanes containing dap or o-dabipy as the thread ligand exhibit uncorrected emission maxima at around 720 nm in room-temperature dichloromethane, while the less constrained analogues, containing dabiiq or m-dabipy, are not emissive in fluid solution and barely exhibit a signal in rigid media. In dichloromethane, the luminescence quantum yields of the dap- and o-dabipy-containing systems are 6 × 10−4 and 4 × 10−4, and the excited-state lifetimes are 98 ns and 90 ns, respectively.

Energy-Conversion Properties of Vapor-Liquid-Solid–Grown Silicon Wire-Array Photocathodes

Science ◽  
2010 ◽  
Vol 327 (5962) ◽  
pp. 185-187 ◽  
Author(s):  
Shannon W. Boettcher ◽  
Joshua M. Spurgeon ◽  
Morgan C. Putnam ◽  
Emily L. Warren ◽  
Daniel B. Turner-Evans ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Hydrogen Generation ◽  
Wire Array ◽  
Short Circuit ◽  
Poor Performance ◽  
Quantum Yields ◽  
Vapor Liquid Solid ◽  
Wire Arrays ◽  
Conversion Efficiencies ◽  
Vapor Liquid

Silicon wire arrays, though attractive materials for use in photovoltaics and as photocathodes for hydrogen generation, have to date exhibited poor performance. Using a copper-catalyzed, vapor-liquid-solid–growth process, SiCl4 and BCl3 were used to grow ordered arrays of crystalline p-type silicon (p-Si) microwires on p+-Si(111) substrates. When these wire arrays were used as photocathodes in contact with an aqueous methyl viologen2+/+ electrolyte, energy-conversion efficiencies of up to 3% were observed for monochromatic 808-nanometer light at fluxes comparable to solar illumination, despite an external quantum yield at short circuit of only 0.2. Internal quantum yields were at least 0.7, demonstrating that the measured photocurrents were limited by light absorption in the wire arrays, which filled only 4% of the incident optical plane in our test devices. The inherent performance of these wires thus conceptually allows the development of efficient photovoltaic and photoelectrochemical energy-conversion devices based on a radial junction platform.

Sign in / Sign up

Export Citation Format

Share Document