P3HT-based visible-light organic photodetectors using PEI/PAA multilayers as a p-type buffer layer.

ABSTRACT: A low leakage current is critical for achieving organic photodetectors (OPDs) with high detectivity. The insertion of buffer layers is an effective approach for reducing the reverse-biased leakage current. In this study, polyelectrolyte multilayers comprising polyethyleneimine (PEI) and polyacrylic acid (PAA) were introduced by a spin-assisted layer-by-layer technique into an OPD as a p-type buffer layer. Although PEI/PAA multilayers are insulators, when used as a buffer layer in our device, they suppressed the leakage current and also provided a high photocurrent due to the light-assisted tunneling effect. The prepared device configuration was ITO/(PEI/PAA)₂/P3HT:PC₆₀BM/Yb/Al. The performances of the OPDs were investigated by measuring the current-voltage characteris

SUBMITTER: Ji CH 

PROVIDER: S-EPMC9075515 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature