Fig. 3: Overview of the assembly method and the importance of a pop-up assisting adhesion-blocking layer (PA-ABL). | Nature Communications

Fig. 3: Overview of the assembly method and the importance of a pop-up assisting adhesion-blocking layer (PA-ABL).

From: 3D height-alternant island arrays for stretchable OLEDs with high active area ratio and maximum strain

Fig. 3

a Illustration of the fabrication process comprised of a sequence involving the transfer of the PDMS layer, followed by OLED transfer and the release of pre-strain. Shown on the left is the biaxial stage with the aligning block used for precise control during the assembly process. b Maximum stress in PI (red) and Al (blue) versus \({{{\varepsilon }}}_{{{\rm{comp}}}}\) obtained for the non-buckled state (circles) and the buckled state (squares). c The measured effective work of adhesion (Gc) vs. the open-area ratio (\({{{\eta }}}_{{{\rm{open}}}}\)) of the PA-ABL, presented as the mean and standard deviation of three measurements. d The measured number of popped-up islands (Nup) vs. \({{{\varepsilon }}}_{{{\rm{comp}}}}\) applied to serpentine connectors. e The false-color SEM images of the fabrication results after the sequential transfer of the OLED device layer and the PA-ABL obtained at \({{{\eta }}}_{{{\rm{open}}}}\) = 0, 41%, and 88%. The images were taken under \({{{\varepsilon }}}_{{{\rm{comp}}}}\) = 80% enabled by equal biaxial strain release. The left schematic images show the selective bonding area (shown with the white outlines in the bottom image) and the blocking (non-bonding) area between the OLED device layer and the PA-ABL. In the blocking area, the PA-ABL covers up the adhesive layer such that the island with the selected OLED is not glued and can eventually be lifted when a sufficient \({{{\varepsilon }}}_{{{\rm{comp}}}}\) is applied.

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