Crackle template based metallic mesh with highly homogeneous light transmission for high-performance transparent EMI shielding

Abstract

Our daily electromagnetic environment is becoming increasingly complex with the rapid development of consumer electronics and wireless communication technologies, which in turn necessitates the development of electromagnetic interference (EMI) shielding, especially for transparent components. We engineered a transparent EMI shielding film with crack-template based metallic mesh (CT-MM) that shows highly homogeneous light transmission and strong microwave shielding efficacy. The CT-MM film is fabricated using a cost-effective lift-off method based on a crackle template. It achieves a shielding effectiveness of ~26 dB, optical transmittance of ~91% and negligible impact on optical imaging performance. Moreover, high–quality CT-MM film is demonstrated on a large–calibre spherical surface. These excellent properties of CT-MM film, together with its advantages of facile large-area fabrication and scalability in processing on multi-shaped substrates, make CT-MM a powerful technology for transparent EMI shielding in practical applications.

EMI Shielding Effectiveness and Heater Behavior for Ge IR Windows

“…However, some optical losses can take place due to the metallic mesh. The OT value of any square metallic mesh is determined as below where: g is the space between the lines and l is the line width in the metallic mesh.…”

“…Metallic mesh structures are very useful for many applications due to the advantages such as low sheet resistance and high optical transmission. At the beginning of these are transparent heater and EMI shielding applications in systems having the optical aperture.…”

“…in the literature . These studies were focused on either heater window performance or EMI shielding effectiveness . In addition, metallic meshes were developed for visible region applications in most of the studies.…”

In Situ Surface Oxidized Copper Mesh Electrodes for High‐Performance Transparent Electrical Heating and Electromagnetic Interference Shielding

“…It is evident from the figure that the o-Cu provides an efficient shielding in the Ku-band. [2] By optimizing the design of structural parameters (e.g., aperture size, linewidth, shape of mesh lattice units) of metallic meshes, the photoelectric property and EMI shielding performance of Cu mesh TCEs can further be improved integratedly. These values exceed many of those of the reported transparent electromagnetic shielding materials (as shown in Table S1, Supporting Information).…”

“…[1][2][3] Indium tin oxide (ITO) is currently the most widely used TCE because of its high transparency and low resistance. [1][2][3] Indium tin oxide (ITO) is currently the most widely used TCE because of its high transparency and low resistance.…”