FOTOVOLTAİK ETKİ OLUŞTURAN LİF GELİŞTİRİLMESİ

Esnek Güneş Pilleri ve
Fotovoltaik Tekstiller
(Flexible Solar Cells and Photovoltaic
Textiles)
AYŞE (ÇELİK) BEDELOĞLU
Yrd. Doç. Dr.
Lif ve Polimer Mühendisliği
Bursa Teknik Üniversitesi
Work experience
• Bursa Teknik Üniversitesi, Fiber and
Polymer Eng. Assist. Prof.Dr. -Feb
2013(Faculty Erasmus Coordinator & Vice
Head of Deparment)
• Dokuz Eylül Üniversitesi, - Dr. Res.Ast.2009- 2013
• Dokuz Eylül Üniversitesi, - Res.Ast.- - Dec
2003- 2009
Education
• Bachelor degree
Dokuz Eylül Üniversitesi- İzmir - 2003
• Master degree
Dokuz Eylül Üniversitesi - İzmir - 2005
• PhD
Dokuz Eylül Üniversitesi - İzmir - 2009
Advisors: Prof.Dr. Yalçın Bozkurt & Prof.Dr. Ali Demir
Thesis: development of fiber with photovoltaic effect
* Visits to Gent University (Belgium) and Johannes Kepler
University (Linz, Austria)
Outline
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Photovoltaic technology
Organic solar cells
Flexible solar cells
Photovoltaic textiles
Our studies
Reasons for searching
renewable energy technologies
• Exhaustion of
conventional
energy
resources
• Environmental
issues
Renewable energy sources
– wood and wood
waste,
– municipal solid waste,
– landfill gas and
biogas,
– ethanol
– biodiesel
Why solar energy?
Why solar energy?
Photovoltaics
“Photovoltaics
is the most direct way to
convert solar radiation into electricity and is
based on the photovoltaic effect, which was
first observed by Henri Becquerel in 1839.
…generally defined as the emergence of an
electric voltage between two electrodes
attached to a solid or liquid system upon
shining light onto this system. Practically all
photovoltaic devices incorporate a pn
junction in a semiconductor across which the
photovoltage is developed.” Goetzberger
and Hoffmann, Photovoltaic Solar Energy
Generation, 2005.
Photovoltaic effect
Photovoltaic’ is a marriage of two words: ‘photo’, from Greek
roots, meaning light, and ‘voltaic’, from ‘volt’, which is the unit
used to measure electric potential at a given point.
Source : EPIA.
Problem
Photovoltaic Applications
Characterization of solar cells
AM1.5 spectrum (1000W/m2) at a cell
temperature of 25 °C (IEC 60904-3: 2008, ASTM
G-173-03 global)
•Isc : Short-circuit current ; Jsc : Short-circuit current density
•Voc : Open-circuit voltage
•FF : Fill factor
•Pin : Incident light power density
•ƞ : Power conversion efficiency
I sc  Voc  FF

Pin
Flexible solar cells
Why Flexible Solar Cells?
•The rigid substrates restricts the solar cells’ adaptability during
transportation, installation, and application.
•The planar and rigid structures cannot adequately meet the
ongoing requirement for small and rapid electronic devices
in the future.
Flexible solar cells
• Thin film technologies
• Dye-sensitized solar cells (DSC) and
• Organic solar cells (OSC)
Dye-sensitized solar cells (DSC) and organic
solar cells (OSC)
•easier fabrication techniques,
•low cost
•flexibility
Disadvantages &advantages DSSCs
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Cost of platinum, FTO and ruthenium dye
The liquid electrolyte
Limited Flexibility
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Higher efficiency
Stability at indoor applications
Organic solar cells
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Cheap
Easy techniques
Flexibility
Large scale
applicability
• Colour variety
• Graded transparency
• Low temperature
Solar cells Efficiencies
(Green et al, Prog. Photovolt: Res. Appl. 2014)
Bulk heterojunction
solar cell
• The absorber layer of an
efficient state of the art
bulkheterojunction solar
cell is made of so-called
donor and acceptor
molecules.
Günes et al., 2007)
Donors: Conjugated polymers, oligomers or conjugated
pigments,
Acceptors: Fullerene derivatives.
They are known for their outstanding optical properties
and their ability to transport charges.
It is generally accepted that in state of the art organic
semiconductors an electron–hole pair (exciton) is
generated upon photon absorption
Benanti & Venkataraman, Organic solar cells: An overview focusing on active layer morphology, Photosynthesis Research (2006) 87:
• Different device architectures of bulk heterojunction solar cells.
(a) Standard device design with the cathode on top of the
device stack and (b) inverted device architecture with the
cathode located on the transparent substrate.
[Scharber and Sariciftci, Efficiency of bulk-heterojunction organic solar cells.
Progress in Polymer Science 38 (2013) 1929– 1940 ]
Disadvantages & advantages of
OSCs
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Cost and application of ITO (substitutes ?)
Difficulties in electrodes (peeling etc.)
Low efficiencies
Life time
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Flexibility
Lightness
Low temperature techniques
Photovoltaic textiles
• The materials giving photovoltaic effect can be
applied onto the textile materials especially
fabrics and garments.
• The best results will be taken from photovoltaic
fibres which can form every type of textile
material such as yarns, nonwovens, knitted or
woven fabrics.
• Flexible solar cells can be integrated into textile
structures or formed as a photovoltaic based
textile (fibre).
PV Publications
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İ Borazan, A. Celik Bedeloglu, A.Demir, The Effect of MWCNT-PEDOT:PSS
Layer in Organic Photovoltaic Fiber Device, Optoelectronics and Advanced
Materials – Rapid Communications accepted 2014.
Ayşe Celik Bedeloglu, Robert Koeppe, Ali Demir, Yalcin Bozkurt, Niyazi S
Sariciftci,, 2010, Development of energy generating photovoltaic textile
structures for smart applications, Fibers and Polymers, 11/3, 378-383
Ayse Celik Bedeloglu, Pablo Jimenez, Ali Demir, Bozkurt Y, Wolfgang K. Maser,
Niyazi Serdar Sariciftci, 2011, Photovoltaic Textile Structure Using
Polyaniline/Carbon Nanotube Composite Materials, The Journal of The Textile
Institute, 102/10, 857-862
Ayse Celik Bedeloğlu, Ali Demir, Yalcin Bozkurt, Niyazi Serdar Sariciftci,, 2010,
Photovoltaic properties of polymer based organic solar cells adapted for nontransparent substrates, Renewable Energy, 35/10, 2301-2306
Ayse Celik Bedeloglu, Ali Demir, Yalcin Bozkurt, Niyazi Serdar Sariciftci,, 2010,
A Photovoltaic Fibre Design for Smart Textiles, Textile Research Journal,
80/11, 1065-1074
Ayse Bedeloglu, Yalcin Bozkurt, Ali Demir, Niyazi Serdar Sariciftci, 2009, A
flexible textile structure based on polymeric photovoltaics using transparent
cathode, Synthetic Metals, 159, 19-20, 2043-2048
Other recent publications
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Ayse Celik Bedeloglu, Sukhwinder K. Bhullar, Zeynep İşlek Cin, İsmail Borazan, Ali Demir , L. Hoşgün
Polycaprolactone (PCL)-based Micro/Nanofiber Webs using Low-Cost Airbrush Technique , in progress 2014.
Sukhwinder K. Bhullar, Ayse Bedeloglu , Martin B.G. Jun, Characterization and Auxetic effect of
polytetrafluoroethylene Tubular structure as stent graft, in progress 2014.
M.F. Can , L. Avdan, A. Bedeloglu , 2014, Properties of biodegradable PVA/Sepiolite-based nanocomposite
fiber mats, Polymer Composites, -, doi 10.1002/pc.23147
AYSE BEDELOGLU, 2014, The influence of heat-setting process on physical properties of ribbon-type,
industria textila, 65-1, 3-9
Ayşe Bedeloğlu, 2013, Electrical, electromagnetic shielding, and some physical properties of hybrid yarn-based
knitted fabrics, Journal of The Textile Institute, Vol. 104, No. 11, 1247–1257
Ayse Bedeloglu, 2013, Investigation of electrical, electromagnetic shielding, and usage properties of woven
fabrics made from different hybrid yarns containing stainless steel wires, Journal of The Textile Institute,
Volume 104, Issue 12, 1359-1373
Ayse Bedeloglu, Nilsen Sunter,, 2013, Investigation of Polyacrylic / Metal Wire Composite Yarn Characteristics
Manufactured on Fancy Yarn Machine, Materials and Manufacturing Processes, 28-6, 650-656
Ayse Bedeloglu, Nilsen Sunter, Bekir Yildirim, Yalcin Bozkurt, 2012, Bending and Tensile Properties of
Cotton/Metal Wire Complex Yarns produced for electromagnetic shielding and conductivity applications, The
Journal of The Textile Institute, 103 12, , 1304-131
Bedeloğlu A, Sunter N, Bozkurt Y, 2011, Manufacturing and properties of yarns containing metal wires,
Materials and Manufacturing Processes, 26, 10, 1-5
Teşekkürler
Teşekkür
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