Planning analysis pipeline for reverse bias measurements
I’ll create a structured pipeline to analyze J-V, EQE, and PL under reverse bias. This involves preconditioning, considering scan rates, and measuring light/dark J-V and forward/reverse scans. For PL, I’ll monitor intensity and shifts, combining with EL imaging. I’ll ensure safety by limiting bias and duration and using a series resistor.
Evaluating hysteresis and degradation under reverse bias
I’ll evaluate hysteresis by checking the "bump" near the maximum power point and looking for S-shaped J-V curves under reverse stress, which may indicate interfacial barriers. By using a reverse bias stress test with constant -1 V under illumination, I’ll track Jsc, Voc, and FF changes over time to monitor degradation.
Linking ion migration and interfacial effects
To interpret the results, I’ll connect ion migration, electrode corrosion (Ag/Au), halide migration, and interfacial band bending to increased series resistance or shunts. For EQE, I’ll acquire spectra at different biases (0 V, +0.5 V, -0.5 V), accounting for field-dependent collection and spectral mismatch. I'll also check for depletion region shrinkage or changes in sub-bandgap response.
Considering EQE mapping
I'm thinking of suggesting EQE mapping against bias in an imaging system, as Bui (2023) indicates. I’ll also note that standard reciprocity relations might fail due to ionic effects when measuring EQE and electroluminescence. To keep ions stable, I should ramp to bias, wait for stabilization, and then chop.
Thought for 52s