A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices
AuthorsTroughton, Joel R.
Isikgor, Furkan Halis
De Wolf, Stefaan
Anthopoulos, Thomas D.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/660512
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AbstractOptoelectronic devices typically require low-resistance Ohmic contacts between the optical active layers and metal electrodes. Failure to make such a contact often results in a Schottky barrier which inhibits charge extraction and, in turn, reduces device performance. Here, we introduce a universal solution processable metal-oxide/organic interfacial bilayer which forms a near-perfect ohmic contact between both organic and inorganic semiconductors and metals. This bilayer comprises a Nb-doped TiO2 metal oxide with enhanced electron mobility and reduced trap density compared to pristine TiO2, in combination with a metal-chelating organic molecule to make an intimate electrical contact with silver metallic electrodes. Using this universal interfacial bilayer, we demonstrate substantial efficiency improvements in organic solar cells (from 9.3% to 12.6% PCE), light emitting diodes (from 0.6 to 2.2 Cd W-1) and transistors (from 19.7 to 13.9 V threshold voltage). In particular, a boost in efficiency for perovskite solar cells (from 18.7% up to 20.7% PCE) with up to 83% fill factor is achieved with no-operational lifetime loss for at least 1000 hours under continuous, full-spectrum illumination.
CitationTroughton, J. R., Neophytou, M., Gasparini, N., Seitkhan, A., Isikgor, F., Song, X., … Baran, D. (2019). A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices. Energy & Environmental Science. doi:10.1039/c9ee02202c
SponsorsL.T. acknowledges support for the computational time granted from GRNET in the National HPC facility – ARIS – under project STEM-2. D.B. acknowledges KAUST for financial support. Y.-H.L. and H.J.S. acknowledge the support from the UK Engineering and Physical Sciences Research Council (grant no. EP/M015254/2).
PublisherRoyal Society of Chemistry (RSC)
JournalEnergy & Environmental Science
Except where otherwise noted, this item's license is described as Archived with thanks to Energy & Environmental Science. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence.