Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM

Harri Aarnio, Parisa Sehati, Slawomir Braun, Mathias Nyman, Machiel Pieter de Jong, Mats Fahlman, Ronald Österbacka

Research output: Contribution to journalArticleAcademicpeer-review

49 Citations (Scopus)

Abstract

In the pursuit of developing new materials for more effi cient bulk-heterojunction solar cells, the blend poly (3-hexylthiophene):[6,6]-phenyl-C 61 -butyric acid methyl ester (P3HT:PCBM) serves as an important model system. The success of the P3HT:PCBM blend comes from effi cient charge generation and transport with low recombination. There is not, however, a good microscopic picture of what causes these, hindering the development of new material systems. In this report UV photoelectron spectroscopy measurements on both regiorandom- (rra) and regioregular- (rr) P3HT are presented, and the results are interpreted using the Integer Charge Transfer model. The results suggest that spontaneous charge transfer from P3HT to PCBM occurs after heat treatment of P3HT:PCBM blends. The resulting formation of an interfacial dipole creates an extra barrier at the interface explaining the reduced (non-)geminate recombination with increased charge generation in heat treated rr-P3HT:PCBM blends. Extensive photoinduced absorption measurements using both above- and below-bandgap excitation light are presented, in good agreement with the suggested dipole formation.
Original languageUndefined
Pages (from-to)792-797
Number of pages6
JournalAdvanced energy materials
Volume1
Issue number5
DOIs
Publication statusPublished - Oct 2011

Keywords

  • EWI-21088
  • IR-79321
  • METIS-287840

Cite this

Aarnio, Harri ; Sehati, Parisa ; Braun, Slawomir ; Nyman, Mathias ; de Jong, Machiel Pieter ; Fahlman, Mats ; Österbacka, Ronald. / Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM. In: Advanced energy materials. 2011 ; Vol. 1, No. 5. pp. 792-797.
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abstract = "In the pursuit of developing new materials for more effi cient bulk-heterojunction solar cells, the blend poly (3-hexylthiophene):[6,6]-phenyl-C 61 -butyric acid methyl ester (P3HT:PCBM) serves as an important model system. The success of the P3HT:PCBM blend comes from effi cient charge generation and transport with low recombination. There is not, however, a good microscopic picture of what causes these, hindering the development of new material systems. In this report UV photoelectron spectroscopy measurements on both regiorandom- (rra) and regioregular- (rr) P3HT are presented, and the results are interpreted using the Integer Charge Transfer model. The results suggest that spontaneous charge transfer from P3HT to PCBM occurs after heat treatment of P3HT:PCBM blends. The resulting formation of an interfacial dipole creates an extra barrier at the interface explaining the reduced (non-)geminate recombination with increased charge generation in heat treated rr-P3HT:PCBM blends. Extensive photoinduced absorption measurements using both above- and below-bandgap excitation light are presented, in good agreement with the suggested dipole formation.",
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author = "Harri Aarnio and Parisa Sehati and Slawomir Braun and Mathias Nyman and {de Jong}, {Machiel Pieter} and Mats Fahlman and Ronald {\"O}sterbacka",
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Aarnio, H, Sehati, P, Braun, S, Nyman, M, de Jong, MP, Fahlman, M & Österbacka, R 2011, 'Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM' Advanced energy materials, vol. 1, no. 5, pp. 792-797. https://doi.org/10.1002/aenm.201100074

Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM. / Aarnio, Harri; Sehati, Parisa; Braun, Slawomir; Nyman, Mathias; de Jong, Machiel Pieter; Fahlman, Mats; Österbacka, Ronald.

In: Advanced energy materials, Vol. 1, No. 5, 10.2011, p. 792-797.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM

AU - Aarnio, Harri

AU - Sehati, Parisa

AU - Braun, Slawomir

AU - Nyman, Mathias

AU - de Jong, Machiel Pieter

AU - Fahlman, Mats

AU - Österbacka, Ronald

N1 - 10.1002/aenm.201100074

PY - 2011/10

Y1 - 2011/10

N2 - In the pursuit of developing new materials for more effi cient bulk-heterojunction solar cells, the blend poly (3-hexylthiophene):[6,6]-phenyl-C 61 -butyric acid methyl ester (P3HT:PCBM) serves as an important model system. The success of the P3HT:PCBM blend comes from effi cient charge generation and transport with low recombination. There is not, however, a good microscopic picture of what causes these, hindering the development of new material systems. In this report UV photoelectron spectroscopy measurements on both regiorandom- (rra) and regioregular- (rr) P3HT are presented, and the results are interpreted using the Integer Charge Transfer model. The results suggest that spontaneous charge transfer from P3HT to PCBM occurs after heat treatment of P3HT:PCBM blends. The resulting formation of an interfacial dipole creates an extra barrier at the interface explaining the reduced (non-)geminate recombination with increased charge generation in heat treated rr-P3HT:PCBM blends. Extensive photoinduced absorption measurements using both above- and below-bandgap excitation light are presented, in good agreement with the suggested dipole formation.

AB - In the pursuit of developing new materials for more effi cient bulk-heterojunction solar cells, the blend poly (3-hexylthiophene):[6,6]-phenyl-C 61 -butyric acid methyl ester (P3HT:PCBM) serves as an important model system. The success of the P3HT:PCBM blend comes from effi cient charge generation and transport with low recombination. There is not, however, a good microscopic picture of what causes these, hindering the development of new material systems. In this report UV photoelectron spectroscopy measurements on both regiorandom- (rra) and regioregular- (rr) P3HT are presented, and the results are interpreted using the Integer Charge Transfer model. The results suggest that spontaneous charge transfer from P3HT to PCBM occurs after heat treatment of P3HT:PCBM blends. The resulting formation of an interfacial dipole creates an extra barrier at the interface explaining the reduced (non-)geminate recombination with increased charge generation in heat treated rr-P3HT:PCBM blends. Extensive photoinduced absorption measurements using both above- and below-bandgap excitation light are presented, in good agreement with the suggested dipole formation.

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KW - IR-79321

KW - METIS-287840

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JO - Advanced energy materials

JF - Advanced energy materials

SN - 1614-6832

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