Conduction mechanisms in poly(3-hexylthiophene) thin-film sandwiched structures

Current density–voltage ( J – V ) characteristics of regioregular poly(3-hexylthiophene) (P3HT) thin-film sandwiched structures are studied and analyzed in this paper. Various material and trap parameters are estimated using the space-charge-limited conduction model with exponential trap distribution. Temperature-dependent J – V characteristics are examined to justify the bulk-limited transport in the material and trap density ( H β ) and characteristic constant ( E t ) are determined. The model is modified using field-dependent trap occupancy (FDTO) and compared. Both the models, with and without FDTO, fit the J – V curves at different temperatures. Though the model with FDTO fits the J – V curve slightly better at high voltages when compared to the model without FDTO, it cannot be established with certainty.