plastic electronics and photonics - gatech.edu
TRANSCRIPT
Stingelin Lab @ Georgia Tech
Our current research interests encompass the broad field of functional organic materials for organic electronics; multifunctional inorganic/organic hybrids for smart, advanced optical systems; and mixed conductors for bioelectronics. Establishing interrelationships between performance, processing and materials’ structure are thereby a central topic. Our group’s multi-disciplinary efforts in the Materials Science field have been exploited to build collaborations across departments and faculties at Georgia Tech, on national level, and internationally.
Inorganic/Organic Hybrid Materials Mixed Conducting Materials
Structure-Property Relationship of Semiconductors and Blends
Mixed conduction materials exhibit simultaneous electronic and ionic conductivity, enabling direct interfacing between electronics and electrochemical systems. We are exploring how structural features of polymers impact both mixed conduction and their physical properties by introducing percolating ion channels into an electrically conducting matrix. Potential applications for mixed conduction include batteries, synthetic neural and cardiomyocyte tissue scaffolds, and biosensors, amongst others.
Indicates phase separation
F2-HCNQ: X = CN
Ni(tfd)2
CN
CNNC
NC
F
FX
F2-HCNQ: X = CN
Ni(tfd)2 5 4 3 2 0.50.40.3 0.210 1
0
20
40
60
80
100
120
140
10:1 5:1 3:1 2:1 1:1 1:2 1:5
Bulk Doping/Dedoping Process
20
40
60
80
100
Mesh size []
Mechanically tunable hydrogels Solution-processed photonic structures Mechanical properties are set by the network mesh size, , and molecular weight between crosslinks, % . These can be tuned by the concentration of titanium oxide hydrate crosslinker and chain entanglements in poly(vinyl alcohol), enabling, e.g., gel-like biomaterials that can mimic the elastic moduli of extracellular matrices.
Sustainable barrier materials (with Meredith Group) Transparent IR mirrors for heat management
Optical reflectance is controlled through multi- layered structures utilizing low optical loss, high refractive index, fully solution processable poly(vinyl alcohol)/titanium oxide hydrate hybrids.
Biopolymer-based sustainable packaging is enabled by cellulose nanocrystals (CNC’s) and/or chitin, crosslinked with titanium oxide hydrate to alter water and oxygen permeability.
Window coatings based on Distributed Bragg Reflectors (DBR’s) with stopband tunable to infrared, while transmitting visible wavelengths.
400 450 500 550 600 650 700
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
n
1
10
100
1
10
100
Altering Ion Conductivity via Side Chain Engineering
P3HT:Ionic liquids Blends for Altering Photophysical Processes
Photophysics of Semiconducting Polymers and Hybrid Materials
Transient Absorption Spectroscopy for Doped Organic Semiconductors
Nonlinear Ultrafast Spectroscopy of Thermal Behavior for Rigid-Rod Polymers
Solution-Processed Platforms for Exciton-Polariton Devices
We study the physical processes that are responsible for the electronic, thermal, and optical properties of semiconducting polymers and inorganic/organic hybrid materials via multiple spectroscopic techniques (in collaboration with the Silva Lab). This project aims to improve our understanding of the fundamental physics that gives rise to specific properties, helping us design better materials and devices.
a) Structure of a solution-processed microcavity. b) Angle-dependent emission of a solution-processed microcavity demonstrating anticrossing, signature of polariton formation, correlated with absorbance and photoluminescence of the emissive 2D material (with Silva Group).
(a)
Organic semiconductor devices (e.g., OPVs, OFETs, thermoelectrics) rely on a unique property set derived from specific materials and materials combinations. However, structure-property relationship of such semiconductor materials and their blends, e.g., with respect to transport properties and photophysics, are not well understood. Here, we focus on a large library of polymers and their blends in order to gain deeper insights into these correlations.
Influence of Polar Ferroelectrics on Organic Photovoltaics
Vitrification-Induced Polymer:Dopant Glass for Tunable Electrical Conductivities
Wavelength (nm)
Our current research interests encompass the broad field of functional organic materials for organic electronics; multifunctional inorganic/organic hybrids for smart, advanced optical systems; and mixed conductors for bioelectronics. Establishing interrelationships between performance, processing and materials’ structure are thereby a central topic. Our group’s multi-disciplinary efforts in the Materials Science field have been exploited to build collaborations across departments and faculties at Georgia Tech, on national level, and internationally.
Inorganic/Organic Hybrid Materials Mixed Conducting Materials
Structure-Property Relationship of Semiconductors and Blends
Mixed conduction materials exhibit simultaneous electronic and ionic conductivity, enabling direct interfacing between electronics and electrochemical systems. We are exploring how structural features of polymers impact both mixed conduction and their physical properties by introducing percolating ion channels into an electrically conducting matrix. Potential applications for mixed conduction include batteries, synthetic neural and cardiomyocyte tissue scaffolds, and biosensors, amongst others.
Indicates phase separation
F2-HCNQ: X = CN
Ni(tfd)2
CN
CNNC
NC
F
FX
F2-HCNQ: X = CN
Ni(tfd)2 5 4 3 2 0.50.40.3 0.210 1
0
20
40
60
80
100
120
140
10:1 5:1 3:1 2:1 1:1 1:2 1:5
Bulk Doping/Dedoping Process
20
40
60
80
100
Mesh size []
Mechanically tunable hydrogels Solution-processed photonic structures Mechanical properties are set by the network mesh size, , and molecular weight between crosslinks, % . These can be tuned by the concentration of titanium oxide hydrate crosslinker and chain entanglements in poly(vinyl alcohol), enabling, e.g., gel-like biomaterials that can mimic the elastic moduli of extracellular matrices.
Sustainable barrier materials (with Meredith Group) Transparent IR mirrors for heat management
Optical reflectance is controlled through multi- layered structures utilizing low optical loss, high refractive index, fully solution processable poly(vinyl alcohol)/titanium oxide hydrate hybrids.
Biopolymer-based sustainable packaging is enabled by cellulose nanocrystals (CNC’s) and/or chitin, crosslinked with titanium oxide hydrate to alter water and oxygen permeability.
Window coatings based on Distributed Bragg Reflectors (DBR’s) with stopband tunable to infrared, while transmitting visible wavelengths.
400 450 500 550 600 650 700
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
n
1
10
100
1
10
100
Altering Ion Conductivity via Side Chain Engineering
P3HT:Ionic liquids Blends for Altering Photophysical Processes
Photophysics of Semiconducting Polymers and Hybrid Materials
Transient Absorption Spectroscopy for Doped Organic Semiconductors
Nonlinear Ultrafast Spectroscopy of Thermal Behavior for Rigid-Rod Polymers
Solution-Processed Platforms for Exciton-Polariton Devices
We study the physical processes that are responsible for the electronic, thermal, and optical properties of semiconducting polymers and inorganic/organic hybrid materials via multiple spectroscopic techniques (in collaboration with the Silva Lab). This project aims to improve our understanding of the fundamental physics that gives rise to specific properties, helping us design better materials and devices.
a) Structure of a solution-processed microcavity. b) Angle-dependent emission of a solution-processed microcavity demonstrating anticrossing, signature of polariton formation, correlated with absorbance and photoluminescence of the emissive 2D material (with Silva Group).
(a)
Organic semiconductor devices (e.g., OPVs, OFETs, thermoelectrics) rely on a unique property set derived from specific materials and materials combinations. However, structure-property relationship of such semiconductor materials and their blends, e.g., with respect to transport properties and photophysics, are not well understood. Here, we focus on a large library of polymers and their blends in order to gain deeper insights into these correlations.
Influence of Polar Ferroelectrics on Organic Photovoltaics
Vitrification-Induced Polymer:Dopant Glass for Tunable Electrical Conductivities
Wavelength (nm)