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Laser EnAbled TransFer of 2D Materials

Periodic Reporting for period 1 - LEAF-2D (Laser EnAbled TransFer of 2D Materials)

Reporting period: 2018-11-01 to 2019-10-31

LEAF-2D aims to introduce Laser Direct Transfer (LDT) processes LIBT and LIFT, as a novel nano-manufacturing platform for the controllable and deterministic transfer of 2D materials onto different substrates including rigid (Si) and flexible substrates. Using LDT processes, the project envisages to exploit the unique properties of 2D materials towards a transformative breakthrough in diverse technological fields namely embedded NIR light sources and flexible graphene-based touch sensors. These unique properties involve the direct and on demand transfer of highly resolved 2D material pixels that can provide a substantial advantage in device fabrication in terms of printing speed and throughput, device miniaturization and elimination of additional fabrication and processing steps.
The importance for society both in societal and economic terms involves advancements in diverse fields including environmental monitoring, communications, healthcare, sensors and displays. The proposed innovative technologies will enable graphene and other 2D materials to change their application status from research to the industrial market stage. LEAF-2D’s low cost printable emitter technology will disrupt the photonics industry and will enable new devices and applications that will provide added-value to the European technological ecosystem. Technological fields that are also expected to be benefited from the project’s outcome include consumer electronics with the integration of high-speed transceivers onto flexible platforms and infrared LEDs for applications including portable spectroscopy systems and gas sensors through the shifting of the operational wavelengths at 1.3 μm in respect of the IEC 60825-1 directive for relaxed eye safety limits.
LEAF-2D’s approach for the realization of the two applications and for the support of the exploitation streams within the timeframe of the project is structured through the following 3 objectives, which have been defined in the DoA as the main project objectives:
Objective 1: Controllable transfer and intact and defect-free 2D material monolayer pixels by means of Laser Direct Transfer processes starting from 2D material films. Lateral resolution down to micron scale.
Objective 2: High quality 2D films growth (Graphene, h-BN, and direct bandgap 2D semiconductors).
Objective 3: Apply LEAF-2D’s technology for the fabrication of 2D materials enabled Si emitters integrated on Si and touch sensors on flexible substrates.
The work done within the framework of WP1 dedicated its efforts to optimize the LIFT and LIBT process on 2D materials and includes the preparation of substrates for LIFT and LIBT and the placement of 2D materials on them by transferring CVD-grown 2D materials onto specialized substrates.
The work performed within WP2 focused on the development of the process maps and specifications for the realization of the Laser Direct Transfer processes. Briefly the work performed can be highlighted as follows. LIFT and LIBT experiments have been performed successfully for the transfer of graphene and MoS2. Within this reporting period, Ab-Initio Molecular Dynamics incorporating temperature as a parameter in modelling the graphene-metal interaction have been also performed.
Also, MELL has carried out the tape-out of the first generation of Si chips, achieving and completing Milestone MS3. The main purpose of this tape-out was to get familiar with the targeted MPW technology, and help the consortium to identify potential ways to integrate the 2D SC enabled emitter on an actual Si photonic platform.
In addition to the tape-out of the first generation of Si platform, MELL has started bilateral discussions with BIU aiming to define the 2D Si emitter design and integration concept, since a 2D material suitable for the 2D Si emitter has been now identified by the university.
WP4 has not started yet during the reporting period and will start its activities in M13. NTUA is the WP leader for this WP, and already during the reporting period has started preparing the designs for the flexible touch sensor that will be realized within the WP4 technical activities.
To disseminate (WP5) the project’s results LEAF-2D has developed a platform of different dissemination tools including the project website, leaflet and poster, social media presence (LinkedIn and Twitter), while a dissemination plan has been also deployed and communicated to the consortium.
All provisioned communication tools and channels have been created and are fully operational. Moreover, an Internal Innovation Survey has been conducted in order to identify exploitable outcomes resulting from LEAF-2D.
WP6 provided an effective platform for the project management and all the necessary technical and administrative activities were performed with respect to the relevant WPs and tasks according to the DoA and the H2020 rules. One of the most important achievements in WP6 was the establishment of an excellent collaboration and communication between all partners of the project.
The innovative ideas of LEAF-2D are being and will be realized during the course of the project within the four (4) technical WPs of the project as follows:
WP1: The progress of new 2D materials with tailored electronic and optical properties, as guided by first principles calculations, provides an exceptional strength to project. While the goal of this project is to use these materials in optoelectronic devices, the actual impact extends much beyond this application and may have additional fundamental and practical aspects.
WP2: The successful, intact transfer of monolayer graphene via LIBT (MS2) is at the leading edge of the current state of the art; this result will be published at Photonics West 2020. The wider impact of this result will primarily be realised through those technology demonstrations. This radical fabrication method (LDT for additive manufacturing of 2D materials) potentially facilitates the creation of an entirely new class of photonic and electronic devices. In addition, the successful transfer of monolayer graphene using LIFT highlights that both LDT processes may have a substantial contribution in advancing current approaches in device fabrication.
WP3: The successful integration of the 2D SC enabled Si emitter targeted in WP3 is expected to have major impact on the current communications ecosystem. The development of lasers on SiPh has been the holy grail of silicon photonic integration for quite many years now, with most of the technology demonstrators however, failing to showcase a low cost solution. Any successful outcome of LEAF-2D project in this direction, will open new vistas in the DataCenter and the ICT environment in general.