Solution processed WO 3 layer for the replacement of PEDOT

PSS layer in organic photovoltaic cells

Hana Choi, Bongsoo Kim, Min Jae Ko, Doh Kwon Lee, Honggon Kim, Sung Hyun Kim, Kyungkon Kim

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Tungsten oxide layer is formed uniformly by a sol-gel technique on top of indium tin oxide as a neutral and photo-stable hole extraction layer (HEL). The solution processed tungsten oxide layer (sWO 3) is fully characterized by UV-Vis, XPS, UPS, XRD, AFM, and TEM. Optical transmission of ITO/sWO 3 substrates is nearly identical to ITOs. In addition, the sWO 3 layer induces nearly ohmic contact to P3HT as PEDOT:PSS layer does, which is determined by UPS measurement. In case that an optimized thickness (∼10 nm) of the sWO 3 layer is incorporated in the organic photovoltaic devices (OPVs) with a structure of ITO/sWO 3/P3HT:PCBM/ Al, the power conversion efficiency (PCE) is 3.4%, comparable to that of devices utilizing PEDOT:PSS as HEL. Furthermore, the stability of OPV utilizing sWO 3 is significantly enhanced due to the air- and photo-stability of the sWO 3 layer itself. PCEs are decreased to 40% and 0% of initial values, when PEDOT:PSS layers are exposed to air and light for 192 h, respectively. In contrast, PCEs are maintained to 90% and 87% of initial PCEs respectively, when sWO 3 layers are exposed to the same conditions. Conclusively, we find that solution processed tungsten oxide layers can be prepared easily, act as an efficient hole extraction layer, and afford a much higher stability than PEDOT:PSS layers.

Original languageEnglish
Pages (from-to)959-968
Number of pages10
JournalOrganic Electronics: physics, materials, applications
Volume13
Issue number6
DOIs
Publication statusPublished - 2012 Jun 1

Fingerprint

Photovoltaic cells
photovoltaic cells
Tungsten
Oxides
Ohmic contacts
Light transmission
Air
Tin oxides
Indium
Conversion efficiency
Sol-gels
tungsten oxides
X ray photoelectron spectroscopy
ITO (semiconductors)
Transmission electron microscopy
Substrates
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
tungsten oxide
air
indium oxides

Keywords

  • Device stability
  • Hole extraction layer
  • Metal oxide
  • Organic photovoltaic cells

ASJC Scopus subject areas

  • Biomaterials
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Solution processed WO 3 layer for the replacement of PEDOT : PSS layer in organic photovoltaic cells. / Choi, Hana; Kim, Bongsoo; Ko, Min Jae; Lee, Doh Kwon; Kim, Honggon; Kim, Sung Hyun; Kim, Kyungkon.

In: Organic Electronics: physics, materials, applications, Vol. 13, No. 6, 01.06.2012, p. 959-968.

Research output: Contribution to journalArticle

Choi, Hana ; Kim, Bongsoo ; Ko, Min Jae ; Lee, Doh Kwon ; Kim, Honggon ; Kim, Sung Hyun ; Kim, Kyungkon. / Solution processed WO 3 layer for the replacement of PEDOT : PSS layer in organic photovoltaic cells. In: Organic Electronics: physics, materials, applications. 2012 ; Vol. 13, No. 6. pp. 959-968.
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