Quantum efficiency of exciton-to-charge generation in organic photovoltaic devices

2001 ◽  
Vol 89 (10) ◽  
pp. 5564-5569 ◽  
Author(s):  
Leif A. A. Pettersson ◽  
Lucimara S. Roman ◽  
Olle Inganäs
Keyword(s):  
Quantum Efficiency ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Charge Generation

scholarly journals Free Charge Photogeneration in a Single Component High Photovoltaic Efficiency Organic Semiconductor

2021 ◽  
Author(s):  
Justin Hodgkiss ◽  
Michael Price ◽  
Paul Hume ◽  
Aleksandra Ilina ◽  
Isabella Wagner ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Organic Photovoltaics ◽  
Photovoltaic Cells ◽  
Single Component ◽  
Dielectric Constants ◽  
Organic Photovoltaic ◽  
Free Charge ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Charge Generation

Abstract Organic photovoltaic cells promise cheap, flexible and scalable solar energy. Whereas light directly generates free charges in silicon photovoltaic cells, bound electron and hole pairs known as excitons are understood to be the primary excitations in organic semiconductors due to their low dielectric constants. These excitons must then be split apart at molecular heterojunctions in order to extract current. Recent record efficiency organic photovoltaics utilise the small molecule, Y6, as a key component in the photon-absorbing blend layer. This molecule and its analogues – unlike previous organic semiconductors – have both low band-gaps and high dielectric constants. Here we show that, in a neat film of Y6, these factors lead to intrinsic free charge generation without the need for a molecular heterojunction to split the exciton. We use a suite of intensity-dependent optical spectroscopy measurements to show that a significant (20-90%) fraction of free charges exist in equilibrium with bound states at light intensity equivalent to 1 sun. Rapid bimolecular charge recombination constrains single component Y6 organic photovoltaic devices to low efficiencies, but this recombination is reduced by the introduction of small quantities of donor polymer. Quantum-chemical calculations reveal charge generation pathways through strong coupling between exciton and CT states, and an intermolecular polarisation pattern that drives exciton dissociation. Our results challenge the understanding of how current record efficiency organic photovoltaics operate, and point towards new future possibilities – offering a molecular picture of intrinsic charge generation as a platform to improve charge yields, and renewing the possibility of efficient single-component organic photovoltaic devices.

Progress in Upscaling Organic Photovoltaic Devices

2021 ◽  
pp. 2100342
Author(s):  
Gabriel Bernardo ◽  
Tânia Lopes ◽  
David G. Lidzey ◽  
Adélio Mendes
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

scholarly journals Mini‐review: materials and modelling for organic photovoltaic devices

2021 ◽  
Author(s):  
Olivier Doat ◽  
Bruno H. Barboza ◽  
Augusto Batagin‐Neto ◽  
Didier Bégué ◽  
Roger C. Hiorns
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

A thermal stable cathode buffer based on an inexpensive tetranuclear zinc(II) complex for organic photovoltaic devices

2012 ◽  
Vol 55 (12) ◽  
pp. 2562-2566 ◽  
Author(s):  
ZhiGang Li ◽  
ZhiQiang Gao ◽  
HaiShan Wang ◽  
Hui Zhang ◽  
XinYan Zhao ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Thermal Stable

Effect of the regioregularity of poly(3-hexylthiophene) on the performances of organic photovoltaic devices

2007 ◽  
Vol 57 (5) ◽  
pp. 764-769 ◽  
Author(s):  
Mathieu Urien ◽  
Loïc Bailly ◽  
Laurence Vignau ◽  
Eric Cloutet ◽  
Anne de Cuendias ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices
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