TY - GEN A1 - Glitzky, Annegret A1 - Liero, Matthias T1 - Analysis of p(x)-Laplace thermistor models describing the electrothermal behavior of organic semiconductor devices N2 - We study a stationary thermistor model describing the electrothermal behavior of organic semiconductor devices featuring non-Ohmic current-voltage laws and self-heating effects. The coupled system consists of the current-flow equation for the electrostatic potential and the heat equation with Joule heating term as source. The self-heating in the device is modeled by an Arrhenius-like temperature dependency of the electrical conductivity. Moreover, the non-Ohmic electrical behavior is modeled by a power law such that the electrical conductivity depends nonlinearly on the electric field. Notably, we allow for functional substructures with different power laws, which gives rise to a $p(x)$-Laplace-type problem with piecewise constant exponent. We prove the existence and boundedness of solutions in the two-dimensional case. The crucial point is to establish the higher integrability of the gradient of the electrostatic potential to tackle the Joule heating term. The proof of the improved regularity is based on Caccioppoli-type estimates, Poincar\'e inequalities, and a Gehring-type Lemma for the $p(x)$-Laplacian. Finally, Schauder's fixed-point theorem is used to show the existence of solutions. KW - Thermistor model, p(x)-Laplacian, nonlinear coupled system, existence and boundedness, regularity theory, Caccioppoli estimates, organic light emitting diode, self-heating, Arrhenius like conductivity law Y1 - 2016 UR - https://opus4.kobv.de/opus4-matheon/frontdoor/index/index/docId/1369 UR - https://nbn-resolving.org/urn:nbn:de:0296-matheon-13699 ER -