The database was initiated by collecting all perovskite device data up to the end of February 2020. Our vision is that the perovskite community should embrace this as a valuable resource and start to upload also new data so that we can stay up to date and build what we can think of as the Wikipedia of perovskite science.

We thus encourage anyone to upload new device data. Ideally, we would like to have data for every device ever made, regardless if it is a highly efficient or a failed device, but some data is much better than no data.

For instructions for how to upload new data into the NOMAD database, see the NOMAD documentation at https://nomad-lab.eu/prod/v1/staging/docs/index.html

Uploading new data will take some time and effort. That is unavoidable, but there are several good reasons to why it is worth that effort.

• This project demonstrates the power of aggregated datasets adhering to the FAIR data principles, and that alone should provide an incentive to contribute.
• Sharing data in this way gives it new life and draws additional attention to the original publication
• Sharing data in this way is a way to comply with the demands for openness more frequently seen from taxpayers, funding agencies, and publishers.
• Uploading as much data as possible, both for good and bad devices, is a service to the community which helps to accelerate the development of new solar cell technology.
• Finally, by planning for sharing data already from the start of a project, the tools and protocols provided here can help in organising and improving local data management and thereby in the end simplify planning, analysis, and writing.