Applications of Lasers in Organic Photovoltaics

Contact Person(s):
Dr. Emmanuel Stratakis


The objective of the activity is the application of laser-based processing and diagnostics in the field of organic photovoltaics (OPVs).


Research Topics
Ultrafast Laser Micro- and Nano- processing


Organic (plastic) photovoltaic devices (OPVs) have the potential to replace their inorganic silicon counterparts especially in low power applications, due to the possibility to produce large area flexible devices with processing technologies employed in the printing industry. Furthermore, OPVs can be processed easily using spin coating, and can be tuned chemically in order to adjust separately band gap, and energy levels. Finally, all-plastic devices can potentially be recyclable minimizing their impact on the environment at the end of their life cycle. Low cost, flexible and potentially recyclable solar panels will have a tremendous economical, environmental and social impact. Our research aim is to exploit laser-based processing and diagnostics techniques in the area of OPVs. We first focus on the pulsed laser assisted synthesis and functionalization of new types of nanostructures that can be exploited for the OPV cells performance improvement. Enhancement of both the efficiency and stability of bulk heterojunction polymer-fullenene OPV devices is demonstrated by the addition of laser-fabricated Au or Al NPs in either the active layer or in the interface between the buffer and the active layers. The development of  novel laser-based spectroscopic tools to probe the dynamics of  different photoexcited processes during light conversion is additionally investigated. In a first effort, the stability of bulk heterojunction OPV blends is diagnosed by laser induced fluorescence (LIF) spectroscopy complemented by device degradation electrical measurements. Current efforts are focused on the application of pump-probe laser spectroscopy to monitor ultrafast carrier dynamics in OPV blends. The research activity is implemented with a joint effort between the Ultrafast Laser Micro- and Nano- Processing (ULMNP) group of the Institute of Electronic Structure and Laser (IESL) of the foundation for Research and Technology Hellas (FORTH) and the Nanomaterials and Organic Electronics group of the Center of Materials Technology and Photonics (CEMATEP) of the Technical Educational Institute (T.E.I) of Crete, headed by Prof. Emmanuel Kymakis. Our mission is to provide research facilities for state of the art research in the multidisciplinary field of nanotechnology and advanced electronics.Further information:

Figure: J-V characteristics of OPV devices with laser-synthesized Au NPs embedded into the active layer


Prof. Emmanuel Kymakis, and Prof. Emmanuel Koudoumas  Dept. of Electrical Engineering, Technical Educational Institute (T.E.I) of Crete.

Dr. Barbara Paci, ISM-CNR Roma, Italy.

A. G. Kanaras, Physics & Astronomy, University of Southampton.


  • Flexible Organic Photovoltaic Cells with In-situ Non-thermal Photoreduction of Spin Coated Graphene Oxide
    Kymakis E., Savva K., Stylianakis M. M., Fotakis C., Stratakis E., Advanced Functional Materials, 10.1002/adfm.201202713, 2013

  • Plasmonic organic photovoltaic devices with graphene based buffer layers for stability and efficiency enhancement
    Stratakis E., Stylianakis M., Koudoumas E., Kymakis E., Nanoscale, DOI: 10.1039/C3NR00656ES, 2013

  • Organic Solar Cells with Plasmonic Layers Formed by Laser Nanofabrication
    Beliatis M.,Henley S., Han S., Gandhi K., Adikaari D., Stratakis E., Kymakis E., Silva S. R., Physical Chemistry Chemical Physics, DOI:10.1039/C3CP51334C, 2013

  • Organic bulk heterojunction photovoltaic devices with surfactant- free Au nanoparticles embedded in the active layer
    Spyropoulos G.D , Stylianakis M.M., Stratakis, E., Kymakis, E , Applied Physics Letters, 100, 213904 , 2012

  • Solution-processable graphene linked to 3,5-dinitrobenzoyl as an electron acceptor in organic bulk heterojunction photovoltaic devices
    Stylianakis M.M., Spyropoulos G.D , Stratakis, E., Kymakis, E, Carbon, 50, 15, 5554–5561, 2012

  • Enhancement of photo/thermal stability of organic bulk heterojunction photovoltaic devices via gold nanoparticles doping of the active layer
    Paci, B.,G.D., Generosi, A., Bailo, D., Albertini, V.R., Spyropoulos G.D., Stratakis, E., Kymakis , Nanoscale, 4, 7452-7459, 2012

  • Organic bulk heterojunction photovoltaic devices based on polythiophene - graphene composites
    Stylianakis M.M., Stratakis, E., Koudoumas E.,Kymakis E, Anastasiadis S.H., ACS Applied Materials and Interfaces, 4, 4864–4870, 2012

  • Enhanced Structural Stability and Performance Durability of Bulk Heterojunction Photovoltaic Devices Incorporating Metallic Nanoparticles
    Barbara Paci, George D. Spyropoulos, Amanda Generosi, Daniele Bailo, Valerio Rossi Albertini, Emmanuel Stratakis, and Emmanuel Kymakis, Advanced Functional Materials, 21, 3573, 2011

  • Plasmonic Organic Photovoltaic Devices on Transparent Carbon Nanotube Sheets
    E. Kymakis, E. Stratakis, E. Koudoumas and C. Fotakis, IEEE Electron Device Letters, 58, 860, 2011

  • Plasmonic organic photovoltaics doped with metal nanoparticles
    G. D. Spyropoulos, M. Stylianakis, E. Stratakis, E. Kymakis, Photonics and Nanostructures - Fundamentals and Applications, 9, 184, 2011

  • Spin coated graphene films as the transparent electrode in organic photovoltaic devices
    Kymakis, E., Stylianakis, M.M., Statakis E. Koudoumas, E., Fotakis, C, Thin Solid Films, 520 1238, 2011

  • Integration of carbon nanotubes as hole transport electrode in polymer/fullerene bulk heterojunction solar cells
    E. Kymakis, E. Stratakis and E. Koudoumas, Thin Solid Films, 515, 8598, 2007

  • Carbon nanotube/PEDOT:PSS electrodes for organic photovoltaics
    E. Kymakis, G. Klapsis, E. Koudoumas, E. Stratakis, N. Kornilios, N. Vidakis and Y. Franghiadakis, European Physical Journal - Applied Physics, 36, 257, 2006

Project Members
Prof. Costas Fotakis
Mr. Emmanouil Amargianitakis
Mr. George Kakavelakis
Ms. Maria Sygletoy
Ms. Kyriaki Savva
Dr. Panagiotis Loukakos
Dr. Emmanuel Stratakis

Last Updated:  14/4/2013