This is true for panels on the market now, and most of those produced in the past. The 33% tandem systems reported on by Ars Technica see severe efficiency degr

This is true for panels on the market now, and most of those produced in the past. The 33% tandem systems reported on by Ars Technica see severe efficiency degradation after just a few hundred hours of full-power operation, so that's something that needs to be solved before perovskite-on-silicon tandem systems enter mass production.