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Unraveling the Nanoscale Morphologies of Mesoporous Perovskite Solar Cells and Their Correlation to Device Performance

2014; American Chemical Society; Volume: 14; Issue: 5 Linguagem: Inglês

10.1021/nl5006838

1530-6992

Diana Nanova, Anne K. Kast, Martin Pfannmöller, Christian Müller, Lisa Veith, Irene Wacker, M. Agari, Wilfried Hermes, Peter Erk, Wolfgang Kowalsky, Rasmus R. Schröder, Robert Lovrinčić,

Organic Electronics and Photovoltaics

Hybrid solar cells based on organometal halide perovskite absorbers have recently emerged as promising class for cost- and energy-efficient photovoltaics. So far, unraveling the morphology of the different materials within the nanostructured absorber layer has not been accomplished. Here, we present the first visualization of the mesoporous absorber layer in a perovskite solar cell from analytical transmission electron microscopy studies. Material contrast is achieved by electron spectroscopic imaging. We found that infiltration of the hole transport material into the scaffold is low and inhomogeneous. Furthermore, our data suggest that the device performance is strongly affected by the morphology of the TiO2 scaffold with a fine grained structure being disadvantageous.