Structural optimization of large acceptor-donor-acceptor-type molecules for improved performance of fullerene-free polymer solar cells

Min Ju Cho, Gi Eun Park, Seo Yeon Park, Young Un Kim, Dong Hoon Choi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

To control the molecular energy levels of highly π-extended n-type molecules, we synthesized two acceptor-donor-acceptor (A-D-A)-type molecules with indacenodithiophenes (IDTs) or IDT-benzodithiophene (BDT)-IDT as donating cores and 2-(2,3-dihydro-3-oxo-1H-inden-1-ylidene)propanedinitrile (IM) as terminal accepting units. These molecules showed different optical and electrochemical properties, indicating that the energy levels can be easily tuned by changing the structure of the donating core. Among two molecules, IM-BDTIDT2 showed a relatively blue shifted absorption spectrum and low-lying highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels. Although IM-IDT3 and IM-BDTIDT2 have a highly π-extended conjugated structure, no clear crystalline behaviour was observed in their thin films. When applied to polymer solar cells (PSCs), the device based on IM-BDTIDT2 displayed a higher PCE (5.33%) than the device bearing IM-IDT3 owing to the lower-lying energy levels of IM-BDTIDT2. Thus, the use of BDT as a donating core unit is favorable for limiting high-lying energy levels in highly π-extended A-D-A-type molecules.

Original languageEnglish
Pages (from-to)38773-38779
Number of pages7
JournalRSC Advances
Volume7
Issue number62
DOIs
Publication statusPublished - 2017

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Fullerenes
Structural optimization
Electron energy levels
Molecules
Molecular orbitals
Bearings (structural)
Electrochemical properties
Absorption spectra
Optical properties
Polymer solar cells
Crystalline materials
Thin films

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Structural optimization of large acceptor-donor-acceptor-type molecules for improved performance of fullerene-free polymer solar cells. / Cho, Min Ju; Park, Gi Eun; Park, Seo Yeon; Kim, Young Un; Choi, Dong Hoon.

In: RSC Advances, Vol. 7, No. 62, 2017, p. 38773-38779.

Research output: Contribution to journalArticle

Cho, Min Ju ; Park, Gi Eun ; Park, Seo Yeon ; Kim, Young Un ; Choi, Dong Hoon. / Structural optimization of large acceptor-donor-acceptor-type molecules for improved performance of fullerene-free polymer solar cells. In: RSC Advances. 2017 ; Vol. 7, No. 62. pp. 38773-38779.
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