Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing

Steve Miller, Giovanni Fanchini, Yun Yue Lin, Cheng Li, Chun Wei Chen, Wei Fang Su, Manish Chhowalla

Research output: Contribution to journalArticle

243 Citations (Scopus)

Abstract

Improvement of the photovoltaic efficiency via exposure of organic poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) devices to solvent vapor at room temperature is reported. In situ photoluminescence (PL) and Raman spectroscopy, in conjunction with ex situ optical absorption and atomic force microscopy, have been used to provide insight into the nanoscale morphological changes occurring during solvent vapor annealing. We found that in 1: 1 composites of P3HT: PCBM, suppression of PL, narrowing in line-width of the 1442 cm-1 P3HT Raman peak, and strong modifications in the optical absorption spectra were observed during solvent vapor annealing, while minimal changes occurred in pure P3HT films. We attribute these spectral modifications to de-mixing of PCBM and subsequent stacking of P3HT in coplanar conjugated segments, similar to what is observed during thermal annealing.

Original languageEnglish
Pages (from-to)306-312
Number of pages7
JournalJournal of Materials Chemistry
Volume18
Issue number3
DOIs
Publication statusPublished - 2008

Fingerprint

Butyric acid
butyric acid
esters
Esters
Vapors
Butyric Acid
Annealing
vapors
Light absorption
annealing
optical absorption
photoluminescence
Photoluminescence spectroscopy
Linewidth
Raman spectroscopy
optical spectrum
Absorption spectra
Atomic force microscopy
Photoluminescence
retarding

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing. / Miller, Steve; Fanchini, Giovanni; Lin, Yun Yue; Li, Cheng; Chen, Chun Wei; Su, Wei Fang; Chhowalla, Manish.

In: Journal of Materials Chemistry, Vol. 18, No. 3, 2008, p. 306-312.

Research output: Contribution to journalArticle

Miller, Steve ; Fanchini, Giovanni ; Lin, Yun Yue ; Li, Cheng ; Chen, Chun Wei ; Su, Wei Fang ; Chhowalla, Manish. / Investigation of nanoscale morphological changes in organic photovoltaics during solvent vapor annealing. In: Journal of Materials Chemistry. 2008 ; Vol. 18, No. 3. pp. 306-312.
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