Photosensitive self-assembling materials as functional dopants for organic photovoltaic cells

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11577-11590 ◽  
Author(s):  
Alexej Bubnov ◽  
Agnieszka Iwan ◽  
Martin Cigl ◽  
Bartosz Boharewicz ◽  
Igor Tazbir ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Liquid Crystalline ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Organic Photovoltaic Cells ◽  
Self Assembling

New photosensitive liquid crystalline compounds with a specific molecular structure have been designed in order to use them as functional dopants for organic photovoltaic devices.

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.

Organic photovoltaic cells containing discotic liquid crystalline phthalocyanines

2004 ◽  
Author(s):  
Seunghyup Yoo ◽  
Benoit Domercq ◽  
Carrie L. Donley ◽  
Chet Carter ◽  
Wei Xia ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells

ChemInform Abstract: ORGANIC PHOTOVOLTAIC CELLS. CORRELATIONS BETWEEN CELL PERFORMANCE AND MOLECULAR STRUCTURE

1984 ◽  
Vol 15 (24) ◽  
Author(s):  
D. L. MOREL ◽  
E. L. STOGRYN ◽  
A. K. GHOSH ◽  
T. FENG ◽  
P. E. PURWIN ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Photovoltaic Cells ◽  
Cell Performance ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells

Organic photovoltaic cells. Correlations between cell performance and molecular structure

1984 ◽  
Vol 88 (5) ◽  
pp. 923-933 ◽  
Author(s):  
D. L. Morel ◽  
E. L. Stogryn ◽  
A. K. Ghosh ◽  
T. Feng ◽  
P. E. Purwin ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Photovoltaic Cells ◽  
Cell Performance ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells

scholarly journals Increased thermal stabilization of polymer photovoltaic cells with oligomeric PCBM

2016 ◽  
Vol 4 (34) ◽  
pp. 8121-8129 ◽  
Author(s):  
Hasina H. Ramanitra ◽  
Simon A. Dowland ◽  
Bruna A. Bregadiolli ◽  
Michael Salvador ◽  
Hugo Santos Silva ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Amorphous Polymer ◽  
Photovoltaic Cells ◽  
Thermal Stabilization ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

Both crystalline and amorphous polymer-based organic photovoltaic devices are stabilized against thermal degradation by an ATRAP prepared PCBM oligomer.

scholarly journals Organic Solar Cells: Problems and Perspectives

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
G. Chidichimo ◽  
L. Filippelli
Keyword(s):  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Photovoltaic Cells ◽  
Electric Energy ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Good Efficiency ◽  
Inorganic Semiconductors ◽  
Research Challenge

For photovoltaic cells to convert solar into electric energy is probably the most interesting research challenge nowadays. A good efficiency of these devices has been obtained by using inorganic semiconductor materials. On the other hand, manufacture processes are very expensive in terms of both materials and techniques. For this reason organic-based photovoltaic (OPV) cells are attracting the general attention because of the possible realization of more economical devices. Organic materials are abundant and easily handling. Unfortunately OPV cells efficiency is significantly lower than that of inorganic-based devices, representing a big point of weakness at the present. This is mainly due to the fact that organic semiconductors have a much higher band gap with respect to inorganic semiconductors. In addition, OPV cells are very susceptible to oxygen and water. In this paper we will describe some of the different approaches to the understanding and improving of organic photovoltaic devices.

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