An important part of neuroscience is developing new concepts directed towards the application of electronics, aiming to investigate the physiological processes in living organisms. This discipline is the product of merging numerous scientific fields, among which is physics. One of the consequences of striving for a better understan ding of neural processes and solving existing problems and diseases related to the nervous system is the organic electrolytic photocapacitor used for light neurostimulation. Understanding its modes of operation and optimizing its performance is the subject of current research. The aim of this thesis is to improve the understanding of the photocapacitor’s working mechanisms and the associated consequences. A photocapacitor, which comprises organic materials that exhibit semiconducting properties, can operate in two regimes, called capacitive and faradaic. This thesis investigates the possibility of their control by adding a bias voltage and the influence of different bias voltage on the photocapacitor’s properties, such as generated photocurrent and the amount of generated charge. Furthermore, bias voltage sources that would be suitable for a photocapacitor are studied by measuring the voltages given by galvanic cells composed of different materials. Galvanic cells made of materials that have shown suitable properties are connected to the photocapacitor, and the performance of such a combination is compared to the performance of a photocapacitor without a galvanic bias. Finally, for the galvanic cells that showed good behaviour in combination with the photocapacitor, the stability of their operation throughout an extended period of time was tested.