3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

This paper demonstrates the methods that allow the fabrication of the hemispherical organic photodiode arrays on curved concave glass substrate. They include a novel 3D shadow mask, fabricated by additive manufacturing process (stereolithography), used for the electrode deposition and 3D shaped polydimethylsiloxane stamp used for organic active layer formation. These techniques allow the direct patterning of the organic photodiode devices on hemispherical substrates without an excessive strain or deformation. It is believed that the developed 3D mask and 3D organic layer transfer printing process can be further utilized for fabrication of various optoelectronic devices which necessitate a free form factor on arbitrary substrates.