A device (111) is proposed. The device (111) comprises - at least one photoconductor (114) configured for exhibiting an electrical resistance Rphoto dependent on an illumination (116) of a light-sensitive region (118) of the photoconductor (114) - at least one photoconductor readout circuit (112), wherein the photoconductor readout circuit (114) is configured for determining the electrical resistance Rphoto of the photoconductor (114), wherein the photoconductor readout circuit (112) comprises at least one bias voltage source (152) configured for applying at least one modulated bias voltage to the photoconductor (114).