TY - JOUR
T1 - Photoconductance of ITO/Conductive Polymer Junctions in the UV and Visible Ranges
AU - Furmansky, Yulia
AU - Sergani, Shlomi
AU - Ashkenasy, Nurit
AU - Visoly-Fisher, Iris
N1 - Funding Information:
Y.F. is grateful to the Mirage fellowship (BGU) for financial support. S.S. is grateful to the Kreitman School (BGU) for the Negev fellowship. The research was supported in part by the Adelis foundation.
Funding Information:
†Department of Solar Energy and Environmental Physics, Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, ‡Department of Materials Engineering, §Ilse Katz Institute for Nanoscale Science and Technology, ∥Department of Chemistry, Ben-Gurion University of the Negev, Be’er Sheva 84105, Israel
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/4/5
Y1 - 2018/4/5
N2 - Controlling charge transfer at indium-doped tin oxide (ITO)/conductive polymer junctions is of special importance for organic photovoltaic (OPV) devices and organic light emitting diodes (OLEDs), where ITO is often the transparent electrode of choice. Light induced conductance enhancement, i.e., photoconductance, can allow such control. ITO/conductive polymer junctions are shown herein to exhibit photoconductance under UV illumination mostly due to photoinduced decrease of an electron barrier at the ITO-polymer interface by discharging of ITO extrinsic surface states, related to the adsorption of oxygen species. Furthermore, we show that ITO surface modification by photoactive porphyrin adsorption can sensitize the ITO/conductive polymer junctions, extending the photoconductance to the visible range, to which ITO is transparent. This process is ascribed mostly to discharging of ITO adsorbate states by recombination with photogenerated holes in the photoexcited molecules. Such sensitization is highly relevant for organic optoelectronic devices utilizing ITO interfaced with photoactive organic species and operating in the visible range, such as OPV and OLED devices, and might be applicable also to other UV-photoconductive metal oxide electrodes.
AB - Controlling charge transfer at indium-doped tin oxide (ITO)/conductive polymer junctions is of special importance for organic photovoltaic (OPV) devices and organic light emitting diodes (OLEDs), where ITO is often the transparent electrode of choice. Light induced conductance enhancement, i.e., photoconductance, can allow such control. ITO/conductive polymer junctions are shown herein to exhibit photoconductance under UV illumination mostly due to photoinduced decrease of an electron barrier at the ITO-polymer interface by discharging of ITO extrinsic surface states, related to the adsorption of oxygen species. Furthermore, we show that ITO surface modification by photoactive porphyrin adsorption can sensitize the ITO/conductive polymer junctions, extending the photoconductance to the visible range, to which ITO is transparent. This process is ascribed mostly to discharging of ITO adsorbate states by recombination with photogenerated holes in the photoexcited molecules. Such sensitization is highly relevant for organic optoelectronic devices utilizing ITO interfaced with photoactive organic species and operating in the visible range, such as OPV and OLED devices, and might be applicable also to other UV-photoconductive metal oxide electrodes.
UR - http://www.scopus.com/inward/record.url?scp=85045079320&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.8b00826
DO - 10.1021/acs.jpcc.8b00826
M3 - Comment/debate
AN - SCOPUS:85045079320
SN - 1932-7447
VL - 122
SP - 7288
EP - 7295
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 13
ER -
