Improving the efficiency of organic photovoltaics by tuning the work function of graphene oxide hole transporting layers

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6925-6931 ◽  
Author(s):  
Emmanuel Stratakis ◽  
Kyriaki Savva ◽  
Dimitrios Konios ◽  
Constantinos Petridis ◽  
Emmanuel Kymakis
Keyword(s):  
Graphene Oxide ◽  
Work Function ◽  
Organic Photovoltaics ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Highly Efficient ◽  
Hole Transporting

Photochlorinated graphene oxide with an increased work function of 5.23 eV as a hole transporting layer in highly efficient organic photovoltaic devices.

Highly efficient organic photovoltaic devices utilizing work-function tuned graphene oxide derivatives as the anode and cathode charge extraction layers

2016 ◽  
Vol 4 (5) ◽  
pp. 1612-1623 ◽  
Author(s):  
Dimitrios Konios ◽  
George Kakavelakis ◽  
Costantinos Petridis ◽  
Kyriaki Savva ◽  
Emmanuel Stratakis ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Work Function ◽  
Organic Photovoltaics ◽  
Buffer Layers ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Highly Efficient ◽  
P Utilization ◽  
Charge Extraction

Utilization of work-function (WF) tuned graphene oxide derivatives as cathode and anode buffer layers in organic photovoltaics (OPVs) is demonstrated.

scholarly journals Melt-processing of small molecule organic photovoltaics via bulk heterojunction compatibilization

2018 ◽  
Vol 20 (10) ◽  
pp. 2218-2224 ◽  
Author(s):  
Aiman Rahmanudin ◽  
Liang Yao ◽  
Xavier A. Jeanbourquin ◽  
Yongpeng Liu ◽  
Arvindh Sekar ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Bulk Heterojunction ◽  
Melt Processing ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

A specially-designed molecular compatibilizer enables bulk-heterojunction organic photovoltaic devices that tolerate melt processing thus reducing the need for toxic solvents.

Highly efficient and stable cupronickel nanomesh electrode for flexible organic photovoltaic devices

2016 ◽  
Vol 331 ◽  
pp. 22-25 ◽  
Author(s):  
Han-Jung Kim ◽  
Myungkwan Song ◽  
Jun-Ho Jeong ◽  
Chang Su Kim ◽  
Srivathsava Surabhi ◽  
...  
Keyword(s):  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Highly Efficient

Perylene bisimide as the cathode modifier in organic photovoltaics: the role of aggregation morphology on the interlayer performance

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 39973-39977 ◽  
Author(s):  
Wenqiang Zhang ◽  
Shu Zhong ◽  
Li Nian ◽  
Yulan Chen ◽  
Zengqi Xie ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Organic Photovoltaic ◽  
Device Performance ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Perylene Bisimide ◽  
Perylene Bisimides ◽  
Cathode Interlayer

Nanorods and nanoparticles of perylene bisimides (PBI-1) were prepared and applied as cathode interlayer in organic photovoltaic devices. The device performance showed important relation with the morphology of the interlayer.

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.

scholarly journals Photovoltaics: Reduced Graphene Oxide Micromesh Electrodes for Large Area, Flexible, Organic Photovoltaic Devices (Adv. Funct. Mater. 15/2015)

2015 ◽  
Vol 25 (15) ◽  
pp. 2206-2206 ◽  
Author(s):  
Dimitrios Konios ◽  
Constantinos Petridis ◽  
George Kakavelakis ◽  
Maria Sygletou ◽  
Kyriaki Savva ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Large Area ◽  
Reduced Graphene

scholarly journals Copper light-catching electrodes for organic photovoltaics

2017 ◽  
Vol 1 (4) ◽  
pp. 859-865 ◽  
Author(s):  
H. Jessica Pereira ◽  
Oliver S. Hutter ◽  
G. Dinesha M. R. Dabera ◽  
Luke A. Rochford ◽  
Ross. A. Hatton
Keyword(s):  
Organic Photovoltaics ◽  
Red Light ◽  
Organic Photovoltaic ◽  
Copper Films ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Photoactive Layer

Plasmon-active optically thin copper films catch red light and transfer the energy to the photoactive layer in organic photovoltaic devices.

Organic Photovoltaic Devices Using Highly Flexible Reduced Graphene Oxide Films as Transparent Electrodes

ACS Nano ◽  
2010 ◽  
Vol 4 (9) ◽  
pp. 5263-5268 ◽  
Author(s):  
Zongyou Yin ◽  
Shuangyong Sun ◽  
Teddy Salim ◽  
Shixin Wu ◽  
Xiao Huang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxide Films ◽  
Organic Photovoltaic ◽  
Transparent Electrodes ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices ◽  
Reduced Graphene
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