Heterogeneous integration of autonomous smart films based on electrochromic transistors

Transcription

1 of autonomous smart films NEWSLETTER #5

2 Objectives SMART-EC has finalized last August 2014; it aimed at the development of self-powered electrochromic (EC) display device with improved speed and lifetime for multifunctional applications as automotive, ID-cards and smart packaging. The simplified concept for the final demonstrators is shown below, where the display in combined with energy harvesting modules (solar cell or/and battery and power controller) and RFID communication or temperature sensor, in case of smart cards or smart packing, respectively. SMART-EC Electrochromic TFT SMART-EC integrated battery Standard integrated PV Gate Anode EC Cathode TFB Electrolyte EC Cathode EC Electrolyte EC Absorbing layers Electrodes Anode TFB Drain Source TCO Major achievements Optimized optical inspection tools for scanning webs in roll to roll systems Roll to roll full integration of functionalities and geometries for both co-integrated and convergence architectures for all demonstrators. Latest events Printed 8x8 inorganic electrochromic passive matrix and scaling up in pilot line facilities M36 Review Meeting European Commission, Brussels 24th 25th November 2013 M42 Technical meeting EMRS Spring Meeting, Lille May 27th 2014 Final Review Meeting European Commission, Brussels October 1st-2nd 2014 Subsystems assembling (Smart ID-card example) 2nd SMART-EC Symposium/Workshop Technical EMRS Spring Meeting, Lille May 28th-30th 2014

3 SP1- Technical Achievements Systems design and requirements The main objectives of this sub-project that was finalized at M36 were: i) System and sub-system definition and design. ii) Definition of the characteristics pertaining to the sub-systems and validation protocols for demonstrators assessment iii) Electrical and geometrical design of the demonstrators iv) Materials selection suitable to the assembling of the prototypes, including substrates v) Definition of production processes for deposition and integration Example of the automotive demo backplane containing the circuitry for the interconnection phase to attach: flexible EC display (8x8 matrix); flexible polymer or TFB; flexible or glass PV cells; thin IC component. SP2 - Deposition technologies The SP2 scope was the optimization of deposition technologies of materials for their integration in the building blocks. The SP2 objectives of the second year of project was the identification of the critical process parameters and the identification of the interaction between processes and materials. EC dual phase printable films with improved electrochemical response and reversibility. LiFePO4/Carbon composite cathodic material with high Crate (commonly the capacity drops around 5C). Changing from crystalline to pre-lithiated amorphous V2O5 Resulted in better solid-solid interfacial resistance and improved capacity for TFBs.

4 SP3 Building Blocks The SP3 was devoted to the development of building blocks to be integrated in the final multifunctional system. The specific objectives within this work are related to : - electrochemical (electrochromic) thin film transistors (ECTFT) for future integration in display, - flexible energy harvesting module (automotive and packaging), - RF antenna coupled with IC for wireless communication. Array of 64 Inorganic (WO3 )EC displays (UNINOVA/ACREO) Concerning this sub-project, in the last year were mainly focused on: Upscaling (in a pilot line facility at ACREO) of the passive electrochromic 8x8 passive matrix displays using printed WO3. EC transistors for integration of EC active matrices Energy harvesting and storage subsystem, namely the production of the batteries and selection of the PV cells to be integrated in the demonstrators Optimization of the auxiliary electronics and communication systems Thin Film Battery and Polymer Battery (CEA and POLITO) RF antenna (ACREO/BIoaAge) PV modules (SOLEMS) All building blocks produced in SP3 were transferred to SP4. Before integration they were tested to determine if they fit the specifications. In the last year the electrochromic transistors (electrolyte gated with WO3 as channel layer) were optimized and integrated in active matrix EC displays made by PVD at UNINOVA. Electrochromic transistors layout, transfer curves, and channel layer coloration in operation Active matrix EC display integrating electrochromic transistors

5 SP4 The objective of the SP4 was the fabrication of the backplanes and integration of the building blocks optimized in SP3 by heterogeneous integration involving dry, wet processes and lamination steps. Co-integrated architecture prototypes The fabrication of prototypes included the following steps: backplane development, pick&place, lamination and vias interconnections. From backplane CAD to film produced by R2R is shown. The film includes all different demonstrators backplane and all masks for auxiliary and IC electronics (BioAge and EMFT). Co-integrated prototypes built starting with different backplane materials (PI, PET, PC), for each type of demonstrators (automotive, packaging, ID card) Convergence architecture prototypes The final convergence integration architecture was composed by a thin film battery or hybridized battery with an electrochromic device (powered by the battery) made using at least three common materials (metal contacts, one electrode and the electrolyte). Two different convergent subsystems were tested. The fabrication procedure involved a collaborative work between CEA, UNINOVA and POLITO. Final convergence subsystem combining printed battery and EC display (left )and polymer battery and wet deposited WO3 (right).

6 A very important exploitable result of SMART-EC is represented by the Orbotech on-line monitoring and recognition tool compatible with R2R. The final result is a Demonstration of operation on a moving foil with delivery level: demonstration system that shows multicameras full width scanning, real time acquisition and low level imaging and offline registration to cam data. Inspection tool from Orbotech with user interface SP5 Demonstrators integration The SP5 objective was the development of prototypes and demonstrators based on the knowledge on design, deposition and integration processes developed in SP2, SP3 and SP4. The high degree of multifunctionality of the novel self-powered flex devices is a key factor for a potential application in: Autonomous systems for automotive, Multifunctional flexible foils for ID-cards and Multifunctional flexible foils for smart packaging. Automotive demo Autonomous systems for automotive - novel dynamic concepts of interior surfaces increased comfort (novel reconfigurable icons, transparent displays) ID card demo Multifunctional flexible foils for ID-cards innovative ID solutions for high security and displays for delivery of information. Smart packaging demo Multifunctional flexible foils for smart packaging innovative track and trace systems, displays for information delivery with integrated sensors for consumer information and satisfaction

7 Latest Events SYMPOSIUM AND WORKSHOP EMRS 2014 Spring Meeting Lille (France) May 26th-30th Symposium R Towards flexible ion based devices Partners UNINOVA, AVREO, CEA, POLITO and CRF have organize the SMARTEC 2nd symposium, this time at the prestigious ERMS Spring Meeting. The aim was to promote discussion among the international scientific community dealing with this topic. The conference had about 4000 attendees and several other running parallel symposiums (30 in total, some on several topics related with SMART-EC, namely on transparent conductors and electrochromic materials and devices). The SMARTEC symposium had a 3 days program with more than 50 contributors coming from different countries including contributions from SMART-EC consortium PROJECT MEETINGS M36 Review meeting European Commission (Brussels) 24th -25th November 2013 The M36 review was held in Brussels (Belgium) in November During the meeting the final outputs of SP2 and SP3 were presented together with advancements in SP4 and SP5. M42 Technical meeting Lille, 27th May 2014 The M42 technical meeting was held in Lille, May 2014, during the SMETEC-EC symposium at the EMRS Spring Meeting. This meeting was focused in checking the status of the achievements in SP5 and SP6, according to the recommendation received from the PO and the reviewers after the M36 review meeting. Final Review meeting European Commission (Brussels) 2nd October st The final review meeting was held in in Brussels (Belgium) in October The latest achievements of the project were presented together with the latest version of the optical inspections system and the final demonstrators.

8 C O N S O R T I U M Contact Vito Lambertini Group Materials Labs Centro Ricerche Fiat S.C.p.A. Strada Torino Orbassano (TO), Italia Tel vitoguido.lambertini@crf.it