Theoretical investigation on the electronic and charge transport characteristics of push-pull molecules for organic photovoltaic cells

Hyunbok Lee, Yeonjin Yi, Sang Wan Cho, Won Kook Choi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We theoretically investigated the electronic and charge transport characteristics of ditolylaminothienyl-benzothiadiazole-dicyanovinylene (DTDCTB), ditolylaminophenyl-benzothiadiazole-dicyanovinylene (DTDCPB) and ditolylaminothienyl-pyrimidine-dicyanovinylene (DTDCTP) push-pull molecules consisting of donor-acceptor-acceptor (D-A-A) configurations for a donor photoactive layer having low energy gaps in organic photovoltaic cells (OPVCs). They commonly have a strong electron-withdrawing moiety and hence conspicuously deep-lying highest occupied molecular orbital (HOMO) levels, leading to high open circuit voltages (VOC) in OPVCs. In addition, they commonly have low hole reorganization energy due to the fully delocalized wave function of the HOMO on over the entire molecule, and high electron reorganization energy due to their contracted wave functions of the lowest unoccupied molecular orbital (LUMO) on a D moiety. However, their theoretically calculated hole and electron mobility (μh and μe) based on Marcus theory in the molecular crystalline is dissimilar: DTDCTB showed the higher μh than μe, DTDCPB showed the similar μh and μe and DTDCTP showed the higher μe than μh, which can explain the tendency of their short circuit current (JSC) in OPVCs. This originates from significantly different electronic coupling, although they have similar π-π coplanar molecular packing in appearance.

Original languageEnglish
Pages (from-to)118-125
Number of pages8
JournalSynthetic Metals
Volume194
DOIs
Publication statusPublished - 2014 Aug

Fingerprint

Photovoltaic cells
photovoltaic cells
Molecular orbitals
Charge transfer
molecular orbitals
pyrimidines
Wave functions
Molecules
electronics
wave functions
molecules
Hole mobility
Electrons
Electron mobility
volatile organic compounds
hole mobility
Open circuit voltage
short circuit currents
open circuit voltage
Volatile organic compounds

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Theoretical investigation on the electronic and charge transport characteristics of push-pull molecules for organic photovoltaic cells",
abstract = "We theoretically investigated the electronic and charge transport characteristics of ditolylaminothienyl-benzothiadiazole-dicyanovinylene (DTDCTB), ditolylaminophenyl-benzothiadiazole-dicyanovinylene (DTDCPB) and ditolylaminothienyl-pyrimidine-dicyanovinylene (DTDCTP) push-pull molecules consisting of donor-acceptor-acceptor (D-A-A) configurations for a donor photoactive layer having low energy gaps in organic photovoltaic cells (OPVCs). They commonly have a strong electron-withdrawing moiety and hence conspicuously deep-lying highest occupied molecular orbital (HOMO) levels, leading to high open circuit voltages (VOC) in OPVCs. In addition, they commonly have low hole reorganization energy due to the fully delocalized wave function of the HOMO on over the entire molecule, and high electron reorganization energy due to their contracted wave functions of the lowest unoccupied molecular orbital (LUMO) on a D moiety. However, their theoretically calculated hole and electron mobility (μh and μe) based on Marcus theory in the molecular crystalline is dissimilar: DTDCTB showed the higher μh than μe, DTDCPB showed the similar μh and μe and DTDCTP showed the higher μe than μh, which can explain the tendency of their short circuit current (JSC) in OPVCs. This originates from significantly different electronic coupling, although they have similar π-π coplanar molecular packing in appearance.",
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Theoretical investigation on the electronic and charge transport characteristics of push-pull molecules for organic photovoltaic cells. / Lee, Hyunbok; Yi, Yeonjin; Cho, Sang Wan; Choi, Won Kook.

In: Synthetic Metals, Vol. 194, 08.2014, p. 118-125.

Research output: Contribution to journalArticle

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AB - We theoretically investigated the electronic and charge transport characteristics of ditolylaminothienyl-benzothiadiazole-dicyanovinylene (DTDCTB), ditolylaminophenyl-benzothiadiazole-dicyanovinylene (DTDCPB) and ditolylaminothienyl-pyrimidine-dicyanovinylene (DTDCTP) push-pull molecules consisting of donor-acceptor-acceptor (D-A-A) configurations for a donor photoactive layer having low energy gaps in organic photovoltaic cells (OPVCs). They commonly have a strong electron-withdrawing moiety and hence conspicuously deep-lying highest occupied molecular orbital (HOMO) levels, leading to high open circuit voltages (VOC) in OPVCs. In addition, they commonly have low hole reorganization energy due to the fully delocalized wave function of the HOMO on over the entire molecule, and high electron reorganization energy due to their contracted wave functions of the lowest unoccupied molecular orbital (LUMO) on a D moiety. However, their theoretically calculated hole and electron mobility (μh and μe) based on Marcus theory in the molecular crystalline is dissimilar: DTDCTB showed the higher μh than μe, DTDCPB showed the similar μh and μe and DTDCTP showed the higher μe than μh, which can explain the tendency of their short circuit current (JSC) in OPVCs. This originates from significantly different electronic coupling, although they have similar π-π coplanar molecular packing in appearance.

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