Wagner, LukasSchygulla, PatrickHerterich, Jan PhilippElshamy, MohamedBogachuk, DmitryZouhair, SalmaMastroianni, SimoneWuerfel, UliLiu, YuhangZakeeruddin, Shaik M.Graetzel, MichaelHinsch, AndreasGlunz, Stefan W.2022-08-152022-08-152022-08-152022-07-0610.1016/j.matt.2022.05.024https://infoscience.epfl.ch/handle/20.500.14299/190076WOS:000829616700002The photocurrent density-voltage (J(V)) curve is the fundamental characteristic to assess opto-electronic devices, in particular solar cells. However, it only yields information on the performance inte-grated over the entire active device area. Here, a method to deter-mine spatially resolved photocurrent images by voltage-dependent photoluminescence microscopy is derived from basic principles. The opportunities and limitations of the approach are studied by the investigation of III-V and perovskite solar cells. This approach allows the real-time assessment of the microscopically resolved local J(V) curve and the steady-state Jsc as well as transient effects. In addi-tion, the measurement contains information on local charge extrac-tion and interfacial recombination. This facilitates the identification of regions of non-ideal charge extraction and enables linking these to the processing conditions. The proposed technique highlights that, combined with potentiostatic measurements, luminescence microscopy can be a powerful tool for the assessment of perfor-mance losses and the improvement of solar cells.Materials Science, MultidisciplinaryMaterials Sciencecircuit current-densitysolar-cellsseries resistancedegradationhysteresistext::journal::journal article::research article