Flexible image sensor array with bulk heterojunction organic photodiode

TitleFlexible image sensor array with bulk heterojunction organic photodiode
Publication TypeJournal Article
Year of Publication2008
AuthorsT.N. Ng, W.S. Wong, M.L. Chabinyc, S. Sambandan, and R.A. Street
Date PublishedMAY 26
AbstractThick organic bulk heterojunction photodiodes with low dark current < 1 nA/cm(2) and efficient charge collection are reported. An electric field > 1 V/mu m is sufficient to achieve > 75% charge collection in films of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-vinylene] and [6,6]-phenyl-C61-butyric acid methyl ester blends up to 4 mu m thick, and the rate of photocurrent decay is reduced at saturation fields. The integration of a 4 mu m thick sensor layer onto a flexible amorphous silicon thin-film transistor backplane gave an image sensor array with 35% external quantum efficiency and noise equivalent power of 30 pW/cm(2) at reverse bias voltage of -4 V. (c) 2008 American Institute of Physics.