Unraveling the nanoscale morphologies of mesoporous perovskite solar cells and their correlation to device performance.
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.
Institute for High-Frequency Technology, TU Braunschweig , 38106 Braunschweig, Germany.
Diana
D
Nanova
Anne Katrin
AK
Kast
Martin
M
Pfannmöller
Christian
C
Müller
Lisa
L
Veith
Irene
I
Wacker
Michaela
M
Agari
Wilfried
W
Hermes
Peter
P
Erk
Wolfgang
W
Kowalsky
Rasmus R
RR
Schröder
Robert
R
Lovrinčić