Rapid and Scalable Transfer of Large‐Area Graphene Wafers

Abstract

Recently, scalable production of large‐area graphene films on metal foils with promising qualities is successfully achieved by eliminating grain boundaries, wrinkles, and adlayers. The transfer of graphene from growth metal substrates onto functional substrates remains one inescapable obstacle on the road to the real commercial applications of chemical vaport deposition (CVD) graphene films. Current transfer methods still require time‐consuming chemical reactions, which hinders its mass production, and produces cracks and contamination that strongly impede performance reproducibility. Therefore, graphene transfer techniques with fine intactness and cleanness of transferred graphene, and improved production efficiency would be ideal for the mass production of graphene films on destination substrates. Herein, through the engineering of interfacial forces enabled by sophisticated design of transfer medium, the crack‐free and clean transfer of 4‐inch‐sized graphene wafers onto silicon wafers within only 15 min is realized. The reported transfer method is an important leap over the long‐lasting obstacle of the batch‐scale graphene transfer without degrading the quality of graphene, bringing the graphene products close to the real applications.

Towards a graphene transparent conducting electrode for perovskite/silicon tandem solar cells

“…105 High-quality, large-area CVD graphene can be transferred to flexible substrates via roll-to-roll techniques, at speeds up to 500 mm/min, 32,105,106 and transferred to rigid substrates within 15 min. 107 The fabrication and charging of the dielectric layer would involve an additional step. Whereas engineering challenges remain for ICD-doped graphene TCEs to match the industrial speeds of TCOs, graphene fabrication and transfer benefits from being less energy intensive than fabricating indiumbased TCOs and is inherently less expensive because of not requiring scarce materials.…”

Recent trends in the transfer of graphene films

“…Recently, post-growth approaches that would transfer graphene films from metal substrates onto required destination substrates have become possible methods to meet application-specific requirements. 20,27,28 In the first report of successful transfer of graphene films (Fig. 2), 29 polymethyl methacrylate (PMMA) was first spin-coated onto the graphene/Cu surface to support graphene films, followed by the delamination of graphene from Cu foil which can be achieved by either chemical etching of the Cu foil (Fig.…”

“…3) can hardly be avoided in the transferred graphene, strongly deteriorating the graphene quality and subsequent device performance. 27…”

2D Materials in Flexible Electronics: Recent Advances and Future Prospectives

“…Nevertheless, similar to conventional PMMA supporting layers, direct contact with the CA supporting layer resulted in physical damage, such as cracks and holes, in the transferred film. Therefore, further efforts are needed to develop a protocol for the residue-free transfer of large-area continuous films. − …”