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Report. Class: Special Topics on Polymers Synthesis. Speaker: C.A. Chen Teacher: G.S Liou 2013.11.15. Introduction of P olymer Solar Cells. Conventional PSCs structure. Ca /Al. Solar spectrum (AM1.5) versus P3HT absorption spectrum (1). Photoactive layer. Advantages of PSCs:

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Report

Report

Class: Special Topics on Polymers Synthesis

Speaker: C.A. Chen

Teacher: G.S Liou

2013.11.15


Introduction ofPolymer Solar Cells

Conventional PSCs structure

Ca/Al

Solar spectrum (AM1.5) versus P3HT absorption spectrum (1)

Photoactive layer

  • Advantages of PSCs:

    • Easy processing, low cost, low weight

    • Mechanical flexibility and transparency

  • Current efficiency of PSCs:

    • Single junction: 10% (Mitsubishi Chemical)

    • Multi junction (tandem): 10.6% (UCLA)

Hole transport layer (PEDOT:PSS)

Transparent electrode (ITO)

Bulk hetero junction photoactive layer(2)

Ref 1: Boer, Polymer Reviews, 2008

Ref 2: Nano Today, 2010, 5, 231


Principle of polymer solar cell
Principle of Polymer Solar Cell

P-type

P-type: polymer

N-type: PCBM

cathode

Energy

N-type

anode

Voc

VmaxJmax

Jsc

  • Jsc is influenced by:

    • 1. Absorption coefficient of materials

    • 2. Morphology of blends of materials

    • 3. Charge mobility of materials

  • Vocis influenced by:

  • Gap of energy levels of materials

①Exciton generation

②Exciton diffusion*

③Charge separation

④Charge transport

FF=(Vmax*Jmax)/(Voc*Jsc)

*The distance of exciton diffusion: 5-14nm

A. B.Holmes et al, Appl. Phys. Lett., 1996, 68 (22), 3120-3122


Rational design of ideal polymer

LUMO

Rational Design of Ideal Polymer

LUMO

LUMO

Energy

Donor

Acceptor

n

HOMO

HOMO

HOMO

Donor

Acceptor

Donor-Acceptor

A.J. Heeger et al., Adv. Mater., 2006, 18, 789–794.

Low Bandgap Polymer


Synthesize low b andgap polymer
Synthesize Low Bandgap Polymer

Suzuki-coupling

Stille-coupling

Stille-coupling reaction and Suzuki-coupling reaction are useful for synthesizing alternating low bandgap polymers.


Conclusion
Conclusion

Ca/Al

Photoactive layer

  • Ideal polymers need:

    • Low cost

    • Easy synthesis

    • Low bandgap

    • Suitable HOMO and LUMO

    • High absorption coefficient

    • Broad UV-Vis absorption

    • High hole mobility

    • High Solubility

  • Polymer solar cells can reach PCE~15% and be highly stable products in the future.

Hole transport layer (PEDOT:PSS)

Transparent electrode (ITO)


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