Guidelines for visual synapse characterisation for PV experts

This document provides standardized experimental guidelines for the characterization of optoelectronic artificial synapses within the SOLIS project. It outlines reproducible measurement protocols for key plasticity phenomena such as short-term and long-term potentiation/depression (STP, LTP, LTD), paired-pulse facilitation (PPF), spike-timing-dependent plasticity (STDP), and conductance retention. The procedures are tailored for photomemristive and photoferroelectric thin-film devices based on chalcogenide and oxide semiconductors, combining optical and electrical stimuli. Each section includes detailed timing, measurement, and data-analysis recommendations to ensure cross-laboratory comparability. The document emphasizes analog rather than binary interpretations of synaptic weight evolution, reflecting trap-mediated charge dynamics as the governing physical mechanism.