Organic photodetector arrays with indium tin oxide electrodes patterned using directly transferred metal masks

Xu, Xin; Mihnev, Momchil; Taylor, Andre; Forrest, Stephen R.
January 2009
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
Academic Journal
We demonstrate the patterning of indium tin oxide (ITO) electrodes with submicron resolution onto both planar and hemispherical plastic surfaces using a process based on the direct transfer of a metal film etch mask via cold welding. Using this process, we fabricate an organic (copper phthalocyanine/C60) photodetector focal plane array on a hemispherical surface in an architecture that mimics the size and form of the human eye. The low absorption of the ITO anodes results in an increase in external quantum efficiency by up to 65% in the visible as compared with that of a previously demonstrated photodetector array with semitransparent Au anodes. The maximum photodetector detectivity is 1.25×1011 cm Hz1/2 W-1.


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