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By
Anish Das
.
.
3/6/2015 1
 Conductive nature of organic semiconductor.
 Source of free electron in organic materials.
 charge carriers in organic...
 At early days organics materials are widely used as
insulating materials specially at semiconductor
industry.
 Alan Hee...
The source of free electron in
polymer is the π bond electron, which is loosely bound
due to the lateral overlap of electr...
The different types of carriers in
organics materials are.
1. Excitons
2. Solitons
3. polarons
3/6/2015 5
 An excitonis an excited
quasiparticle in a solid, which is
formed by a Coulomb-bound
electron-hole pair.
 It is more pr...
Soliton is a structural distortion in
organic materials and forms when two single bonds meet.
Single bonds moves through o...
 Polaron is the coupling of electron/hole is
the lattice.
 Because organic materials does not have
prominent periodicity...
Use a blend of acceptor(fullerene) and donor(conjugated
polymer).
Light absorption in donor and stable exciton generation....
Here we are using two kind of
materials. One is donor to produce exciton and acceptor
dissociate exciton attract electrons...
As stated above that light is absorbed
by donor material or conjugated polymer & exciton is
generated. This exciton is sta...
Excitons are electrically neutral so it
will come to the interface of donor and acceptor by only
diffusion and see differe...
At the interface of donor and acceptor
materials the exciplex will see different atmosphere i.e.
different potential i.e e...
Polaron pairs formed at the acceptor
and donor lattice is still in coulomb attraction. So we have
to apply external voltag...
As the polaron pairs are separated by applipled volrage
then they will move towards the metal electrods by
hopping transpo...
Exciplex Exciton
3/6/2015 16
Ready to illuminate your purpose.
3/6/2015 17
3/6/2015 18
3/6/2015 19
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Organic solar cell

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Organic solar cell

  1. 1. By Anish Das . . 3/6/2015 1
  2. 2.  Conductive nature of organic semiconductor.  Source of free electron in organic materials.  charge carriers in organic semiconductor.  Basic mechanism of organic solar cell operation. 3/6/2015 2
  3. 3.  At early days organics materials are widely used as insulating materials specially at semiconductor industry.  Alan Heeger was the 1st person to propose that under certain circumstances organic materials can act as conducting materials.  And the condition in congutaed polymer, i.e. alternating double and single bonds. Simplest exam is poly acetylene. It is available in trans and sis form.  trans form is very conductive like silvery powder, more conductive than Si. 3/6/2015 3
  4. 4. The source of free electron in polymer is the π bond electron, which is loosely bound due to the lateral overlap of electron orbitals and is perpendicular to the sigma bond. Sigma bond is strong bond cause covalencey is there. 3/6/2015 4
  5. 5. The different types of carriers in organics materials are. 1. Excitons 2. Solitons 3. polarons 3/6/2015 5
  6. 6.  An excitonis an excited quasiparticle in a solid, which is formed by a Coulomb-bound electron-hole pair.  It is more prominent in organic semiconductors as compared to their inorganic counterparts: as the dielectric constant is lower in organics 3/6/2015 6
  7. 7. Soliton is a structural distortion in organic materials and forms when two single bonds meet. Single bonds moves through out the polymer chain, i.e. soliton wave propagates, i.e electron is propagating through out the chain give rise to the current. 3/6/2015 7
  8. 8.  Polaron is the coupling of electron/hole is the lattice.  Because organic materials does not have prominent periodicity like wise in crystal. So the charge carriers see potential difference at bound with the lattice. 3/6/2015 8
  9. 9. Use a blend of acceptor(fullerene) and donor(conjugated polymer). Light absorption in donor and stable exciton generation. Exciton diffusion/ Polaron production. Polaron pair dissociation and free 𝑒− -ℎ+ pairs generation. Charge transport and get current. 3/6/2015 9
  10. 10. Here we are using two kind of materials. One is donor to produce exciton and acceptor dissociate exciton attract electrons. It’s a kind of interfacing device. 3/6/2015 10
  11. 11. As stated above that light is absorbed by donor material or conjugated polymer & exciton is generated. This exciton is stable due to low K and high binding energy. 3/6/2015 11
  12. 12. Excitons are electrically neutral so it will come to the interface of donor and acceptor by only diffusion and see different potential or atmosphere, known as exciplex Exciplex 3/6/2015 12
  13. 13. At the interface of donor and acceptor materials the exciplex will see different atmosphere i.e. different potential i.e exciplex will feel potential difference. Then the electron will be drifted to the acceptor lattice and hole to the donor latttice i.e. exciplex dissociation occurs. And forms polarons pairs. These pair is still in coulomb bound. 3/6/2015 13
  14. 14. Polaron pairs formed at the acceptor and donor lattice is still in coulomb attraction. So we have to apply external voltage to dissociate them. This is one of the draw back of organic solar cell. 3/6/2015 14
  15. 15. As the polaron pairs are separated by applipled volrage then they will move towards the metal electrods by hopping transport. Hopping transport is very slow and depends on 𝐸2−𝐸1 𝑇 . E1 E2 3/6/2015 15
  16. 16. Exciplex Exciton 3/6/2015 16
  17. 17. Ready to illuminate your purpose. 3/6/2015 17
  18. 18. 3/6/2015 18
  19. 19. 3/6/2015 19

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