Funding: European Regional Development Fund and National Funds
- ThrakikaEkkokistiria S.A.
- Democritus University of Thrace, Laboratory Of Micro and Nano-Technology
- ETAKEI S.A.
- Aloukom SA
- Don & Low Hellas ABEE.
Main Contractor:ThrakikaEkkokistiria SA
Scientific coordinator ofDUTH research group: Nikolaos Georgoulas, MNTLab Director, Professor
Technical Objectives and Requirements
Τhe proposed project aims at integrating inorganic photovoltaic cells in flexible synthetic sheets and "non-woven"textiles which are the substrates in the subsequent manufacture of the final products . Also the possibility of using new organic photovoltaic cells based on special properties and exhibiting novel conductive polymers will be explored. The products to be developed will be evaluated for their potential use and performance in collection and conversion of solar energy.
Results of the Project
- Photovoltaic materials have been developed, such as amorphous silicon (doped or not) and ITO with optoelectronic properties that enable their use in the manufacture of Photovoltaic cells.
- Manufacture processes have been developed, which allow the integration of Photovoltaic cells in foreign substrates, contact layers ( ITO and Al) and printing technics.
- The inability to insert Photovoltaic cells on plastic substrates such as PP , PE and PC is not failure of the project and the deposition technique used, but a real problem that is associated with their low temperature resistance limit ( < 95 ° C ). Besides, the currently used in the literature flexible substrates are either PI or PE.
Researchers involved (from DUTH)
- N.Georgoulas, MNT Lab Director, Professor, Electrical Engineering Department
- A. Thanailakis, Emeritus MNT Lab Directorand Professor, Electrical Engineering Department
- I. Karafyllidis, Professor,Electrical Engineering Department
- D.Sountris, Professor Electrical Engineering Department
- D.Girginoudi, MNT Lab member, Assistant Professor, Electrical Engineering Department@DUTH
- S.Matziris, MNT Lab Technician,Electrical Engineering Department@DUTH
- G.Zardalidis, Phd Student, Electrical Engineering Department@DUTH
- Ch.Tsiarapas, MNT Lab,Phd Student, Electrical Engineering Department@DUTH
Properties of a-Si:H films deposited by RF magnetron sputtering at 950C
D. Girginoudi, C. Tsiarapas and N. Georgoulas
2009. E-MRS 2009 Spring Meeting, Symposium B, Strasbourg, France, June 8-12, 2009
Development of solar cells from RF- sputtered a-SiH films on flexible plastic substrates
D. Girginoudi, C. Tsiarapas and N. Georgoulas
2009. 2nd International Symposium On Flexible Organic Electronics (IS-FOE09), Halkidiki, Greece, July 8-10, 2009
Properties of a-Si:H films deposited by RF magnetron sputtering at 95°C
2011. D. Girginoudi, C. Tsiarapas and N. Georgoulas
Applied Surface Science, 257(9), 3898-3903, doi: 10.1016/j.apsusc.2010.11.115
Abstract: In this work we have investigated the dependence of optical and electrical properties of RF sputtered undopeda-Si:H films and B or P doped a-Si:H films on hydrogen flow rate (FH). Low deposition temperature of 95 °C was used, a process compatible with low-cost plastic substrates. FTIR spectroscopy and ESR measurements were used for the investigation of Si–Hx bonding configurations, and concentrations of hydrogen and dangling bonds. We found that there is a strong correlation between the total hydrogen concentration, the dangling bonds density and the optoelectronic properties of the films. The best photosensitivity value was found to be 1.4 × 104 for the undoped films. The dark conductivity (σD) of the doped layers varied from 5.9 × 10−8 to 6.5 × 10−6 (Ω cm)−1 for different ratios FAr/FH. These variations are attributed to both the different B and P concentrations in the films (according to SIMS measurements) and the enhanced disorder of the films introduced by the large number of inactive impurities. The B doping efficiency is lower compared to the P one. A small photovoltaic effect is also observed in n–i–p solar cells fabricated on polyimide (PI) substrates having ITO as antireflective coating, with an efficiency of 1.54%.
Keywords: Amorphous silicon, Low temperature sputtering, Doping, Structural-optoelectronic properties, Solar cells
Simulation of dye-sensitized solar cells based on a population dynamics model
I.G. Karafyllidis, N. Georgoulas
2012. Current Nanoscience, 8, (2), 312-316, doi: 10.2174/157341312800167597
Abstract: Dye-sensitized solar cells are electrochemical devices with very interesting properties that provide an alternative to the conventional semiconductor solar cell technology. However, the details of the charge transport mechanisms, which include both electronic and ionic transport, are not yet fully understood. In this paper, we present a novel approach to dye-sensitized solar cell modeling and simulation which is based on population dynamics models that have recently been extensively used to model reactions between biological molecules. It is shown that the proposed model can be used to simulate the operation of dye-sensitized solar cells and produces I-V characteristics that are in qualitative agreement with the experimental ones. Furthermore, the model presented here can be used to optimize the characteristics and the design of dye-sensitized solar cells.
Keywords: Dye-sensitized solar cells, modeling, simulation, population dynamics