Here we present highly efficient, large-area perovskite solar cells (PSCs) where the perovskite active layer is deposited by thermal co-evaporation. The co-evaporated MAPbI3 perovskite films are pinhole-free and uniform over several centimeters, showing low surface roughness, and a long carrier lifetime. The perovskite films’ high-quality lets the fabrication of small area PSCs (0.16 cm2) with PCEs above 20%, high reproducibility in both n.i.p and p.i.n configurations, and an impressive thermal and environmental stability over months. Similarly, the first co-evaporated mini-modules (20 cm2) achieved record PCEs above 18.%.
We have also developed colored semi-transparent PSCs and mini-modules. The semi-transparent PSCs achieved PCEs consistently ~16.0% for the wide range of colors realized.
Our work represents a significant step towards the development of large-area PSCs and mini-modules and the future commercialization of perovskite technology.
We present a study of spectroscopic proprieties of poly(n-vinylcarbazole) (PVK) and PVK doped with iridium complexes tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)3) films prepared by spin-coating from toluene and chlorobenzene solutions. A different molecular organization of the polymer on the substrate during the spin-coating process can be produced using solvents with different boiling temperatures. The modified molecular rearrangement affects the emission properties of the PVK material and the consequent energy transfer to the doping molecules. Both static and dynamic fluorescence emissions properties have been studied, for pure PVK and PVK doped with different weight percentage of Ir(ppy)3. Different organic light-emitting devices, using a simple architecture, have been prepared with both solvents to test the change in electroluminescence spectral shape and in electrical characteristic, and the final efficiencies of the devices have been evaluated.
In this work we have compared the effect of using solvents with different boiling temperature on the spectroscopic
emission proprieties of poly(n vinylcarbazole) (PVK) and PVK doped with Iridium complexes
tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)3) films, due to the different organization of the polymer on the substrate during the spin
coating process. The modified molecular rearrangement affects the emission properties of the PVK material and the
consequent energy transfer to the doping molecules. Both Static and dynamic emissions proprieties have been studied,
for the case of pure PVK and PVK doped with different weight percentage of Ir(ppy)3. Different devices have been
prepared to test the change in electroluminescence spectral shape and in electrical characteristic and the final efficiencies
of the devices have been evaluated.
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