The present invention relates to a biochip for capacitive stimulation and/or detection of biological tissue. The biochip includes a support structure, at least one stimulation and/or sensor device, which is arranged in or on the support structure, and at least one dielectric layer, one layer surface of which is arranged on the stimulation and/or sensor device and the opposite layer surface forms a stimulation and/or sensor surface for the capacitive stimulation and/or detection of biological tissue. The dielectric layer includes (Ti_x, Zr_1-x)O₂, with 0.99x0.5, or a TiO₂ and ZrO₂ layer arrangement.