Quantifying the performance of perovskite retinomorphic sensors

Perovskite retinomorphic sensors (PRSs) produce an output voltage in response to changes in optical intensity, but not to constant illumination. While these devices have been demonstrated experimentally, there does not yet exist a robust quantitative model for their behaviour. In this report, we derive a simple relationship between output voltage and optical power density in response to a step-change in illumination intensity. From this model we derive a parameter , which can serve as a proxy for PRS performance. We outline a simple strategy to extract from device data and demonstrate this technique on two sets of experimental data. We evaluate a maximum = 5.3 × 10−4 cm mW−1/2. We approximate that a target value of = 1 cm mW−1/2 would be adequate for most commercial applications and discuss some optimization strategies that could be followed to increase .