In this particular context, efficiency can be a PV panel spec that measures how much of your sunlight that hits a solar panel is transformed into electric power. Any floor passivation layer have to be removed in advance of applying the electrodes – one example is by laser ablation (see https://than-rak26036.snack-blog.com/35743895/the-single-best-strategy-to-use-for-cell-solar-system-statement