There are several open access device simulators for perovskite/organic solar cells, and the best one may depend on the specific needs and goals of your research. Some of the most commonly used open access simulation tools include:
PC1D: This is a one-dimensional (1D) device simulator that can be used to model perovskite/organic solar cells and calculate their performance characteristics.
SimPV: This is an open-source tool that can be used to simulate perovskite solar cells and predict their performance under different operating conditions.
SolarCell: This is a Matlab-based tool that can be used to model the performance of perovskite and organic solar cells.
SCAPS: This is a simulation tool that can be used to model the performance of perovskite solar cells, including their efficiency, fill factor, and open-circuit voltage.
Multi1D: This is a 1D simulation tool that can be used to model the performance of perovskite/organic solar cells and predict their performance under different operating conditions.
Note: These are just some of the available open access simulation tools, and there may be other tools that are more suitable for your specific research needs.