Meter-scale van der Waals films manufactured via one-step roll printing
Kyuho Lee, Naoki Higashitarumizu, Shu Wang, Chung Hee Kim, Chun Yuen Ho, Jin Woo Oh, Guangtao Zan, Morten Madsen, Tae‐Woo Lee, D. C. Chrzan, Cheolmin Park, Ali Javey
Abstract
A weak van der Waals (vdW) force in layered materials enables their isolation into thin flakes through mechanical exfoliation while sustaining their intrinsic electronic and optical properties. Here, we introduce a universal roll-printing method capable of producing vdW multilayer films on wafer-to-meter scale. This process uses sequential exfoliation and transfer of layered materials from the powder sources to target substrates through a repeated rolling of a cylindrical metal drum. We achieve uniformly coated films with a library of vdW powders on various mechanically rigid and flexible substrates. The printed films are configured into different devices including light-emitting diodes and photodetectors. The presented technique offers substantial benefits in terms of cost efficiency and a low thermal budget while offering high material quality.