disadvantage solar cell
TRANSCRIPT
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Organic Solar Cells
Rahul Dewan
Organic Electronics Course PresentationInternational University Bremen
4th May 2006
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Outline
1 IntroductionSolar CellsOrganic Solar Cells
2 Physics of Organic Solar CellsStructureWorking principle
3 Research ProspectsComparisonImproving efficiency
4 Reference
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
History of Solar Cell
Started with French scientist Edmond Becquerel’s photoelectric experiments in1839.
First solar cell using junctions was built by an American, Charles Fritts in 1883. (Itwas formed using coated selenium and gold, as a result, efficiency of only 1%)
Albert Einstein publishes his paper on the photoelectric effect in 1905 for which helater receives the nobel prize.
Energy efficient silicon solar cell finally built in 1941 by Russell Ohl.
In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the siliconphotovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable ofconverting enough of the sun’s into power to run everyday electrical equipments.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
History of Solar Cell
Started with French scientist Edmond Becquerel’s photoelectric experiments in1839.
First solar cell using junctions was built by an American, Charles Fritts in 1883. (Itwas formed using coated selenium and gold, as a result, efficiency of only 1%)
Albert Einstein publishes his paper on the photoelectric effect in 1905 for which helater receives the nobel prize.
Energy efficient silicon solar cell finally built in 1941 by Russell Ohl.
In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the siliconphotovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable ofconverting enough of the sun’s into power to run everyday electrical equipments.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
History of Solar Cell
Started with French scientist Edmond Becquerel’s photoelectric experiments in1839.
First solar cell using junctions was built by an American, Charles Fritts in 1883. (Itwas formed using coated selenium and gold, as a result, efficiency of only 1%)
Albert Einstein publishes his paper on the photoelectric effect in 1905 for which helater receives the nobel prize.
Energy efficient silicon solar cell finally built in 1941 by Russell Ohl.
In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the siliconphotovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable ofconverting enough of the sun’s into power to run everyday electrical equipments.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
History of Solar Cell
Started with French scientist Edmond Becquerel’s photoelectric experiments in1839.
First solar cell using junctions was built by an American, Charles Fritts in 1883. (Itwas formed using coated selenium and gold, as a result, efficiency of only 1%)
Albert Einstein publishes his paper on the photoelectric effect in 1905 for which helater receives the nobel prize.
Energy efficient silicon solar cell finally built in 1941 by Russell Ohl.
In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the siliconphotovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable ofconverting enough of the sun’s into power to run everyday electrical equipments.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
History of Solar Cell
Started with French scientist Edmond Becquerel’s photoelectric experiments in1839.
First solar cell using junctions was built by an American, Charles Fritts in 1883. (Itwas formed using coated selenium and gold, as a result, efficiency of only 1%)
Albert Einstein publishes his paper on the photoelectric effect in 1905 for which helater receives the nobel prize.
Energy efficient silicon solar cell finally built in 1941 by Russell Ohl.
In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the siliconphotovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable ofconverting enough of the sun’s into power to run everyday electrical equipments.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Schematics of p-n junction Solar Cell
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Operation of p-n junction Solar Cell
The I-V characteristic of such a device is given by
I = Is“
eqV/kT − 1”− IL (1)
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Operation of p-n junction Solar Cell
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Equations related to Solar Cell
From equation (1), when I = 0, we obtain the open circuit voltage, VOC
VOC =kT
qln
„ILIS
+ 1«∼=
kT
qln
„ILIS
«(2)
The maximum output power Pm is,
Pm = ImVm ∼= IL
»VOC −
kT
qln
„1 +
qVm
kT
«−
kT
q
–(3)
Fill factor FF is given by,
FF =ImVm
ILVOC(4)
And, the power conversion efficiency η
η =FF .ILVOC
Pin(5)
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
Solar CellsOrganic Solar Cells
Why Organic Solar Cells ?
The discovery of metal-like electrical conductivity of polyacetylene in 1976 byShirakawa with Heeger and MacDiarmid opened the field of research of polymers.
Avdantages of organic solar cells !
Relatively cheap in production and purification.
Materials can be tailored for the demand.
Can be used on flexible substrate.
Can be shaped or tinted to suit architectural applications.
Disadvantages of solar cells!
Do not reach the energy conversion efficiency exceeding 24 % in inorganicmaterials.
Limited lifetime/ stability issue.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Types of organic solar cells
There are 3 types of organic solar cells.1 Dye sentisized nanocrystalline TiO2 solar cells.2 Molecular organic solar cells.3 Polymer solar cells.[Meissner, 1999]
Attracting great interest as photovolatic materials.Breakthrough came with the introduction of the bulk heterojunction.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Types of organic solar cells
There are 3 types of organic solar cells.1 Dye sentisized nanocrystalline TiO2 solar cells.2 Molecular organic solar cells.3 Polymer solar cells.[Meissner, 1999]
Attracting great interest as photovolatic materials.Breakthrough came with the introduction of the bulk heterojunction.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Types of organic solar cells
There are 3 types of organic solar cells.1 Dye sentisized nanocrystalline TiO2 solar cells.2 Molecular organic solar cells.3 Polymer solar cells.[Meissner, 1999]
Attracting great interest as photovolatic materials.Breakthrough came with the introduction of the bulk heterojunction.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Types of organic solar cells
There are 3 types of organic solar cells.1 Dye sentisized nanocrystalline TiO2 solar cells.2 Molecular organic solar cells.3 Polymer solar cells.[Meissner, 1999]
Attracting great interest as photovolatic materials.Breakthrough came with the introduction of the bulk heterojunction.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Device structure
ITO Indium Tin OxidePEDOT:PSS Poly (ethylene-dioxythiophene) doped
with polystyrenesulphonic acidMMDO-PPV (poly-(2-methyloxy, 5-(3,7 - dimethyloctyloxy))
para phenylene-vinylene)PCBM ([6,6]-Phenyl C61 butyric acid methyl ester
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Materials used
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
From light into electricity
In three essential steps, light energy is transformed into electricity by organic solarcells.
1 Absorption of light2 Charge carrier generation3 Transport of the opposite charges to the opposite contacts.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
From light into electricity
In three essential steps, light energy is transformed into electricity by organic solarcells.
1 Absorption of light2 Charge carrier generation3 Transport of the opposite charges to the opposite contacts.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
From light into electricity
In three essential steps, light energy is transformed into electricity by organic solarcells.
1 Absorption of light2 Charge carrier generation3 Transport of the opposite charges to the opposite contacts.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
From light into electricity
In three essential steps, light energy is transformed into electricity by organic solarcells.
1 Absorption of light2 Charge carrier generation3 Transport of the opposite charges to the opposite contacts.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
StructureWorking principle
Metal-insulator-metal(MIM) model
For four situations, a semiconductor, sandwiched between two metal electrodes withdifferent work functions, is depicted above.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
ComparisonImproving efficiency
Performance evaluation
Type of cell Efficiency(%) Research needsCrystalline silicon 24 Higher production yields, lowering of cost
and energy contentMulticystalline silicon 18 Lower manufacturing cost and complexityAmorphous silicon 13 Lower production costs, increase
production volume and stabilityOrganic solar cells 2-3 Improve stability and efficiency
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
ComparisonImproving efficiency
Outlook & Strategies
Device performance can be optimized by optimization of the device physics.
Optimize the choice of metallic electrodes.
Optimize the choice of donor-acceptor pair. The bandgap of the semiconductorshould be chosen for efficient harvesting of the solar spectrum.
Optimize the network morphology of the phase-separated composite material forenhanced transport and carrier generation.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
ComparisonImproving efficiency
Outlook & Strategies
Device performance can be optimized by optimization of the device physics.
Optimize the choice of metallic electrodes.
Optimize the choice of donor-acceptor pair. The bandgap of the semiconductorshould be chosen for efficient harvesting of the solar spectrum.
Optimize the network morphology of the phase-separated composite material forenhanced transport and carrier generation.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
ComparisonImproving efficiency
Outlook & Strategies
Device performance can be optimized by optimization of the device physics.
Optimize the choice of metallic electrodes.
Optimize the choice of donor-acceptor pair. The bandgap of the semiconductorshould be chosen for efficient harvesting of the solar spectrum.
Optimize the network morphology of the phase-separated composite material forenhanced transport and carrier generation.
Rahul Dewan Organic Solar Cells
IntroductionPhysics of Organic Solar Cells
Research ProspectsReference
For Further Reading
M. GratzelPhotoelectrochemical cells.Nature, Vol 414, 15 November 2001.
C.J. Brabec et al.Plastic Solar Cells.Advanced Functional Materials, 2001, 11, No 1. February
C. WinderSentisization of Low Bandgap Polymer Bulk Heterojunction Solar Cells.
S.M. SzeSemiconductor Devices, Physics and Technology.
S. DimitrijevUnderstanding Semiconductor Devices.
D. Meissner.Photon 2, 34-37
Rahul Dewan Organic Solar Cells