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Fabrication of patterned organic multilayer devices using dynamic release layer assisted Laser Induced Forward Transfer

English title Fabrication of patterned organic multilayer devices using dynamic release layer assisted Laser Induced Forward Transfer
Applicant Nüesch Frank
Number 119925
Funding scheme Project funding (Div. I-III)
Research institution Departement Moderne Materialien, ihre Oberfläche und Grenzflächen EMPA
Institution of higher education Swiss Federal Laboratories for Materials Science and Technology - EMPA
Main discipline Condensed Matter Physics
Start/End 01.04.2008 - 31.12.2011
Approved amount 224'782.00
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Keywords (19)

triazene polymers; laser ablation transfer; photodecomposition; time resolved shadowgraphy; organic thin films; spin coating; laser ablation; laser deposition; pixel; dynamic release layer; photo-decomposition; organic light-emitting devices; organic electronics; laser ablation; organic light-emitting devices; patterning; laser ablation transfer; conjugated polymers; triplet emitters

Lay Summary (English)

Lead
Polymer multilayer devices such as light-emitting diodes, organic transistors, solar cells, photodiodes or biochips require the sequential and patterned deposition of thin polymer layers. So far, solution processes have been applied due to their low cost, but wet layer-by-layer deposition is often impeded by the fact that adding further layers dissolves underlying layers. Furthermore, lateral structuring with higher resolution is often not possible using established solution methods. Laser-based thin-film deposition methods bear the potential for high-resolution patterning. Most methods, however, often destroy the functional polymeric materials due to their high thermal load or due to photoinduced degradation.
Lay summary
The primary goal of this project is to study the laser transfer process of thin organic functional films from a donor substrate to a receiver substrate. The process is based on photo-decomposition of a triazene polymer release layer that provides the necessary propelling force for this dry deposition method. Among other issues, the gap distance between donor and acceptor substrate as well as the pressure dependence of the surrounding atmosphere are addressed. The transfer of a single polymer layer which eventually permits versatile multilayer fabrication is established. Industrially relevant solid-state lasers are also evaluated for the transfer process. Finally, efficient state-of-the-art organic light-emitting diodes are demonstrated using either polymers or small organic molecules. From a fundamental point of view the ablation process is understood in more depth. The dependence of the transfer characteristics, e.g. flyer speed and shape, as a function of laser parameters (fluence, wavelength, pulse length, beam profile) and surrounding gas pressure is of utmost interest to develop a model for triazene based laser transfer. The fate of the triazene release layer as well as the chemical and structural properties of the transferred layer are central to understand and elaborate the proposed transfer method.
Direct link to Lay Summary Last update: 07.12.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer
Stewart James Shaw, Lippert Thomas, Nagel Matthias, Nuesch Frank, Wokaun Alexander (2012), Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer, in Applied Physics Letters, 100(20), 203303.
Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate-substrate gap width
Shaw-Stewart J, Chu B, Lippert T, Maniglio Y, Nagel M, Nuesch F, Wokaun A (2011), Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate-substrate gap width, in APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 105(3), 713-722.
Laser-induced ablation dynamics and flight of thin polymer films
Frank P, Shaw-Stewart J, Lippert T, Boneberg J, Leiderer P (2011), Laser-induced ablation dynamics and flight of thin polymer films, in APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 104(2), 579-582.
Laser-Induced Forward Transfer of Polymer Light-Emitting Diode Pixels with Increased Charge Injection
Shaw-Stewart J, Lippert T, Nagel M, Nuesch F, Wokaun A (2011), Laser-Induced Forward Transfer of Polymer Light-Emitting Diode Pixels with Increased Charge Injection, in ACS APPLIED MATERIALS & INTERFACES, 3(2), 309-316.
Liposome micropatterning based on laser-induced forward transfer
Palla-Papavlu A, Paraico I, Shaw-Stewart J, Dinca V, Savopol T, Kovacs E, Lippert T, Wokaun A, Dinescu M (2011), Liposome micropatterning based on laser-induced forward transfer, in APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 102(3), 651-659.
Laser induced forward transfer of soft materials
Palla-Papavlu A, Dinca V, Luculescu C, Shaw-Stewart J, Nagel M, Lippert T, Dinescu M (2010), Laser induced forward transfer of soft materials, in JOURNAL OF OPTICS, 12(12), 124014-124019.
Laser-Induced Forward Transfer of Organic LED Building Blocks Studied by Time-Resolved Shadowgraphy
Fardel R, Nagel M, Nuesch F, Lippert T, Wokaun A (2010), Laser-Induced Forward Transfer of Organic LED Building Blocks Studied by Time-Resolved Shadowgraphy, in JOURNAL OF PHYSICAL CHEMISTRY C, 114(12), 5617-5636.
Laser-Induced Forward Transfer Using Triazene Polymer Dynamic Releaser Layer
Stewart James Shaw, Lippert Thomas, Nagel Matthias, Nüesch Frank, Wokaun Alexander (2010), Laser-Induced Forward Transfer Using Triazene Polymer Dynamic Releaser Layer, in International Symposium on High Power Laser Ablation 2010, Santa FeAmerican Institute of Physics, Melville, USA.
Laser-Induced Forward Transfer: An Approach to Single-Step Polymer Microsensor Fabrication
Dinca V, Fardel R, Shaw-Stewart J, Di Pietrantonio F, Cannata D, Benetti M, Verona E, Palla-Papavlu A, Dinescu M, Lippert T (2010), Laser-Induced Forward Transfer: An Approach to Single-Step Polymer Microsensor Fabrication, in SENSOR LETTERS, 8(3), 436-440.
Microfabrication of polystyrene microbead arrays by laser induced forward transfer
Palla-Papavlu A, Dinca V, Paraico I, Moldovan A, Shaw-Stewart J, Schneider CW, Kovacs E, Lippert T, Dinescu M (2010), Microfabrication of polystyrene microbead arrays by laser induced forward transfer, in JOURNAL OF APPLIED PHYSICS, 108(3), 033111-033117.
The effect of laser pulse length upon laser-induced forward transfer using a triazene polymer as a dynamic release layer
Stewart J. Shaw, Fardel R., Nagel M., Delaporte P., Rapp L., Cibert C., Alloncle A. -P., Nuesch F., Lippert T., Wokaun A. (2010), The effect of laser pulse length upon laser-induced forward transfer using a triazene polymer as a dynamic release layer, in Journal of Optoelectronics and Advanced Materials, 12(3), 605-609.
Energy Balance in a Laser-Induced Forward Transfer Process Studied by Shadowgraphy
Fardel R, Nagel M, Nuesch F, Lippert T, Wokaun A (2009), Energy Balance in a Laser-Induced Forward Transfer Process Studied by Shadowgraphy, in JOURNAL OF PHYSICAL CHEMISTRY C, 113(27), 11628-11633.
Laser ablation of energetic polymer solutions: effect of viscosity and fluence on the splashing behavior
Fardel R, Urech L, Lippert T, Phipps C, Fitz-Gerald JM, Wokaun A (2009), Laser ablation of energetic polymer solutions: effect of viscosity and fluence on the splashing behavior, in APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 94(3), 657-665.
Micro-patterning for polymer electrolyte fuel cells: Single pulse laser ablation of aluminum films from glassy carbon
Seyfang BC, Fardel R, Lippert T, Scherer GG, Wokaun A (2009), Micro-patterning for polymer electrolyte fuel cells: Single pulse laser ablation of aluminum films from glassy carbon, in APPLIED SURFACE SCIENCE, 255(10), 5471-5475.
Shadowgraphic studies of triazene assisted laser-induced forward transfer of ceramic thin films
Kaur KS, Fardel R, May-Smith TC, Nagel M, Banks DP, Grivas C, Lippert T, Eason RW (2009), Shadowgraphic studies of triazene assisted laser-induced forward transfer of ceramic thin films, in JOURNAL OF APPLIED PHYSICS, 105(11), 113119-1-113119-9.
Shadowgraphy investigation of laser-induced forward transfer: Front side and back side ablation of the triazene polymer sacrificial layer
Fardel R, Nagel M, Nuesch F, Lippert T, Wokaun A (2009), Shadowgraphy investigation of laser-induced forward transfer: Front side and back side ablation of the triazene polymer sacrificial layer, in APPLIED SURFACE SCIENCE, 255(10), 5430-5434.

Collaboration

Group / person Country
Types of collaboration
Empa-PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel

Awards

Title Year
ETH Medaille 2009

Associated projects

Number Title Start Funding scheme
107666 Patterned Polymer Multilayer Light-Emitting Device Fabrication using Laser Induced Forward Transfer 01.09.2005 Project funding (Div. I-III)

Abstract

In the preceding SNF project No. 200021-107666 entitled “Patterned Polymer Multilayer Light-Emitting Device Fabrication using Laser induced Forward Transfer” we have succeeded in the detailed characterization of the polymer ablation of thin films and detected a clear influence of the film thickness on the ablation threshold which we could model in detail by considering the laser penetration depth and heat conductivity of the substrate. This has then been the basis for the transfer of organic light-emitting device (OLED) materials using thin triazene layers as dynamic release layers. The transfer was performed successfully for a bi-layer system consisting of the OLED polymer MEH-PPV and an aluminum electrode. We demonstrated a successful transfer of a simple OLED structure onto conducting glass substrates and assessed that the performance of the laser deposited devices was equivalent to devices fabricated by spin-coating. Under the experimental conditions used in this study, we observed that the transfer was only possible within a relatively small fluence window. To fully understand and optimize the process both fundamental and applied research is required. A primary goal is to study the laser transfer process in more depth. Among other issues, the gap distance between donor and acceptor and the pressure dependence of the surrounding atmosphere shall be ad-dressed. The transfer of a single polymer layer which eventually permits versatile multilayer fabrication has to be established. Industrially relevant solid-state lasers shall also be evaluated for the transfer process. Finally, efficient state-of-the-art diodes shall be demonstrated using either polymers or small organic molecules. From a fundamental point of view we want to understand the ablation process in more depth. The dependence of the transfer characteristics, e.g. flyer speed and shape, as a function of laser parameters (fluence, wavelength, pulse length, beam profile) and surrounding gas pressure is of utmost interest to develop a model for triazene based laser transfer. The fate of the triazene release layer as well as the chemical and structural properties of the transferred layer are central to understand and elaborate the proposed transfer method. Ripple structure formation observed during the laser pulse are still not fully explained. The limitations regarding the pixel size that can be transferred have to be explored. From the mechanistic point of view it is still under debate whether the ablation process is mainly governed by a photochemical reaction, a thermal reaction or both. Future investigations looking at the intensity dependence of photodegradation of triazene polymers with different chemical compositions shall shed light on this matter.
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