NOVELTY - Organic passivation composition comprises: a crosslinking agent; and an oligomer or a polymer that includes structural units of substituted pyrrolidine-2,5-dione compounds (I) and substituted hydroxy compounds (II).    USE - The organic passivation composition is useful: in organic passivation layer; in thin film transistor of electronic device; and in solar cell (all claimed).    ADVANTAGE - The organic passivation composition: improves long-term reliability of organic thin film transistor and electronic device; and utilizes oligomer or polymer that controls viscosity and provides excellent smoothness.    DETAILED DESCRIPTION - Organic passivation composition comprises: a crosslinking agent; and an oligomer or a polymer that includes structural units of substituted pyrrolidine-2,5-dione compounds of formula (I) and substituted hydroxy compounds of formula (-Cy2(OH)k-) (II).    Cy1 = functional group including one of 4-20C carbocyclic, 6-20C monocyclic aromatic or 2-20C condensed polycyclic aromatic (all optionally substituted) or 2-20C non-condensed polycyclic aromatic;    Cy2 = one of 6-C40 arylene, 3-40C heteroarylene, 5-40C cycloalkylene or 5-40C heterocycloalkylene (all optionally substituted); and    k = greater than or equal to 2.    INDEPENDENT CLAIMS are also included for:    (1) a organic passivation layer fabricated from the organic passivation composition;    (2) a thin film transistor comprising a substrate (10), a gate electrode (20) on the substrate, an organic semiconductor layer on the substrate, a gate insulating layer (30) between the gate electrode and the organic semiconductor layer, a source electrode (40) and a drain electrode (50) connected to the organic semiconductor layer, and the organic passivation layer, where the organic passivation layer covers at least the organic semiconductor layer;    (3) an electronic device comprising the thin film transistor; and    (4) a solar cell comprising at least one organic photoactive layer between a pair of electrodes and the organic passivation layer, where the organic passivation layer covers the at least one organic photoactive layer and the pair of electrodes.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of the organic thin film transistor having bottom-contact and bottom gate structure.    Substrate (10)    Gate electrode (20)    Gate insulating layer (30)    Source electrode (40)    Drain electrode (50)