chapter 3. organic conductor
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Chapter 3. Organic Conductor. Conductivity Of Organic Materials. Conductivity s = en m. n: number of carriers; m: mobility of the carriers. Electronic structures of Organic Molecules Core electrons. s electrons, localized between two atoms. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 3. Organic Conductor
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Conductivity Of Organic Materials
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Conductivity = en
n: number of carriers; m: mobility of the carriers
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Electronic structures of Organic Molecules(1) Core electrons.(2) electrons, localized between two atom
s.(3) n electrons, located at a particular hetero
atom, usually have high orbital energy and could be promoted easily.
(4) electrons, delocalized over an array of atoms, usually have high MO energy and could be promoted easily.
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Discovery of Conducting Organic Crystals
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S
S
S
S
S
S
S
S
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Conductivity is controlled by the phthalocyanine ring.The metal core does not interfere the conductivity.
Phthalocyanine channel
I-
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Chain length: Si:12030Ge: 7440Sn:10040
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Conjugated Polymers
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Polyacetylene
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(1) Could a charge through delocalize through the array?
(2) Is there any one dimensional conductor in principle?
(3) How a charge hop from one array to another adjacent array?
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Electrical conductivity of polyacetylene
Cis-PA = 1.7 x 10-9 S/cmTrans-PA = 4.4 x 10-5 S/cm
I2 doped = 5.5 x 102 S/cmAsF5 doped = 1.2 x 103 S/cmElectrochemical Oxidation = 1 x 103 S/cm
Li doped = 2 x 102 S/cmNa doped = 101-10-2 S/cm
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Polyparaphenylene (PPP)
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Synthesis of Polyarylenes
2n CuCl2n
n
AlCl3
n XX
Mg or Zn Ni(0)/ Zn
n XX
Suzuki Coupling
n XX
n BBRO
RO OR
OR
+Pd (cat)
Drawbacks: low solubility.
n
Alkyl side chain for enhancing solubility
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When no of phenylene units is larger than 12, the material becomes metallic after doped
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Synthesis of Polythiophenes
S
O O
n
PSS
PEDOT.PSS
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Polyaniline (PANI)
Conductor
Insulator
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Preparation
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Doping and Undoping
PANI doped with H3PO4 was found to be most stable.
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NH
NH
N N NH
NH
Conductivity could go up to 200-400 S/cm after doping
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Poly-4-phenylene-(E)-vinylene (PPV)
Highly insoluble
Precursor for thin film formation
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Knoevenagel Condensation
(EtO)2PO OP(OEt)2
R
R
O OR'
R'H H
+t-BuOK
R
R
R'
R'
Wittig Horner reaction
RClCl
t-BuOK
Cl+
R
Hsieh, B. R. (Xerox)
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Lithium Battery
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Rechargeable BatteryWith PA electrode
Oxidation(CH)x+xy(ClO4
-)
[(CH)+y(ClO4-)y]x + xye-
Reduction(CH)x+xy(Li+) + xye-
[(CH)-y(Li+)y]x
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Battery Structures based on PA(a)P type (CH)x anode/Li cathode(b)P type (CH)x anode/n type (CH)x cathode(c)n type (CH)x anode /Li cathode
When the battery is doped at 6%, the
Voltages are 3.7, 2.5, 1.2V respectively
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Rechargeable Battery
with poly-4-phenylene electrode
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Organic Photoconductors
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excited stateground stateh
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Scher-Montrol Theory on dispersive photocurrent
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Organic Photoconductors(1) Conjugated polymers(2) Polymers containing aromatic side-chains(3) Small molecules
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Organic Solar Cell
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Organic Solar Cell
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Example
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Self-Organized Discotic Liquid Crystals for High-Efficiency Organic Photovoltaics
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