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My self and my students have recently put a lot of effort into improving the materials data base. This means improved, absorption and refractive index data, this can affect the calculate device efficiency. If you want to reproduce a device efficiency from a previous version of gpvdm, go to Simulations->Optica Simulation->Optical setup->Photon Efficiency. And play with this value, until you can reproduce the old efficiency. You should only have to change the value by 20% or so.