Fig. 1: Preparation and transfer of Pechini-derived CCTO films. | Nature Communications

Fig. 1: Preparation and transfer of Pechini-derived CCTO films.

From: Transferrable, wet-chemistry-derived high-k amorphous metal oxide dielectrics for two-dimensional electronic devices

Fig. 1: Preparation and transfer of Pechini-derived CCTO films.

a Schematic of the Pechini process, mainly including the chelation of single metal cations by citric acid and the polymerization of the chelates initiated by ethylene glycol. b Representative optical images of as-prepared amorphous CCTO thin films on a SiO2/Si wafer (top panel), the detachment of one PMMA-protected CCTO film from the original substrate (middle panel), and the transferred film on a target substrate (bottom panel). Scale bars: 3 mm. c Typical AFM image (top panel) and histograms of the height distributions over a relatively large area (9 μm2) on surfaces of SiO2, 1L-CCTO, and 5L-CCTO films, respectively. Solid lines are Gaussian fits to these distributions. Scale bars: 1 μm. d Raman spectra of one MoS2 flake before and after transferring a CCTO film on top. Insets: optical images of the MoS2 samples on a SiO2/Si substrate (left) and covered by a transferred CCTO film (right). Scale bars: 10 μm (inset). e Schematic and STEM image of a CCTO/MoS2 heterostructure. Scale bars: 5 nm.

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