TOF

TOF

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DI

DI-SCLC

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AS

AS

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OTFT

OTFT

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OPV

OPV

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PDS

PDS

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Research Interests and Projects

The above projects are tied to the general interests of my group in organic electronics materials and devices. Particular examples are organic light-emitting diodes (OLEDs), solar cells and organic thin film transistors (OTFTs). Among these devices, OLEDs are finding worldwide recognition as the leading contender for ultra-thin flat panel displays. The central scientific issue to be studied will be the conductivities of organic electronic materials that are relevant to organic electronic devices. Most of the projects are designed to measure conductivities and advance the understanding the mechanisms of conductivity in organic electronic materials. Besides conductivities, we are also interested in forming efficient charge injection contacts to organics.

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Research mobile1

Research Interests and Projects

The above projects are tied to the general interests of my group in organic electronics materials and devices. Particular examples are organic light-emitting diodes (OLEDs), solar cells and organic thin film transistors (OTFTs). Among these devices, OLEDs are finding worldwide recognition as the leading contender for ultra-thin flat panel displays. The central scientific issue to be studied will be the conductivities of organic electronic materials that are relevant to organic electronic devices. Most of the projects are designed to measure conductivities and advance the understanding the mechanisms of conductivity in organic electronic materials. Besides conductivities, we are also interested in forming efficient charge injection contacts to organics.

General References

c

Organic electronics: materials, processing, devices and applications

S.C. Tse, C.H. Cheung, and S.K. So, F. So Ed.,

Chap. 3, CRC Press, Francis and Taylor (2010). 

Read more »  

TOF paper

Carrier trapping and scattering in amorphous organic hole transporter 

K.K. Tsung and S. K. So

APPLIED PHYSICS LETTERS 92, 103315 (2008).

Abstract »     Copyright Notice » 

Free Download » 

JDT

Carrier transport and injection to Phenylamine-based hole transporters for OLEDs applications

S.C. Tse, K.K. Tsung and S. K. So

JOURNAL OF DISPLAY TECHNOLOGY 3, 225-232 (2007). 

Abstract »    

Other References

(I) Organic solar cells

Impact of Solvent Additive on Carrier Transport in Polymer:Fullerene Bulk Heterojunction Photovoltaic Cell

Carr H.Y. Ho, Q. Dong, H. Yin, Winky W.K. Leung, Q. Yang, .K.H. Lee, S.W. Tsang, and S.K. So, Advanced Materials Interfaces 2, 1500166 (2015).

Batch-to-Batch Variation of Polymeric Photovoltaic Materials: its Origin and Impacts on Charge Carrier Transport and Device Performances

Harrison Ka Hin Lee, Zhao Li, Iordania Constantinou, Franky So, Sai Wing Tsang, and Shu Kong So, Advanced Energy Material 4, 1400768 (2014).

(II) Time of Flight

Carrier trapping and scattering in amorphous organic hole transporter

K.K. Tsung and S. K. So, APPLIED PHYSICS LETTERS 92, 103315 (2008).  Abstract »  Copyright Notice »  Free Download »

Electron transport in naphthylamine-based organic compounds

S.C. Tse, K.C. Kwok, and S.K. So, Appl. Phys. Lett. 89, Art. No. 262102 (2006). Abstract »  Copyright Notice »  Free Download »

Hole transports in molecularly doped triphenylamine derivative

H.H. Fong, K.C. Lun, and S.K. So, Chem. Phys. Lett. 353, 407-413 (2002).

(III) Dark injection space-charge-limited-current

Role of electron blocking and trapping layers in transport characterization of a  photovoltaic polymer poly(3-hexylthiophene)

Harrison K.H. Lee, Kevin K.H. Chan, S.K. So, Organic Electronics 13,541-544 (2012).

Origin of Enhanced Hole Injection in inverted Organic Devices with Electron Accepting Interlayer

Cephas E. Small, Sai-Wing Tsang, Junji Kido, Shu Kong So, and Franky So, Advanced Functional Materials 22, 3261-3266 (2012).

Role of air exposure in the improvement of injection efficiency of transition metal oxide/organic contact

C.H. Cheung, W.J. Song, and S.K. So, Organic Electronics 11,89-94 (2010).

Polymeric conducting anode for small organic transporting molecules in dark injection experiments

S.C. Tse, S.W. Tsang, and S.K. So, J. Appl. Phys. 100, Art. No. 063708 (2006).  Abstract »  Copyright Notice »  Free Download »

(IV) Admittance spectroscopy

Charge Transport Study of Semiconducting Polymers and Their Bulk Heterojunction Blends by Capacitance Measurements

Kevin K. H. Chan, S. W. Tsang, Harrison K. H. Lee, F. So, S. K. So,  JOURNAL OF POLYMER SCI., PART B: POLYMER PHYSICS, 000, 001-010 (2013).

Advantages of admittance spectroscopy over time-of-flight technique for studying dispersive charge  transport in an organic semiconductor 

K.K. Tsung and S.K. So, J. Appl.Phys. 106, 083710 (2009). Abstract »  Copyright Notice »  Free Download »

Application of admittance spectroscopy to evaluate carrier mobility in organic charge transport materials

S.W. Tsang, S.K. So, and J.B. Xu, J. Appl. Phys. 99, Art. No. 013706 (2006). Abstract »  Copyright Notice »  Free Download »

(V) Organic thin film transistors

Probing Bulk Transport, Interfacial Disorders, and Molecular Orientations of Amorphous Semiconductors in a Thin-Film Transistor Configuration

Wai-Yu Sit, Sin Hang Cheung, Cyrus Yiu Him Chan, Ka Kin Tsung, Sai Wing Tsang,and Shu Kong So, Adv. Electron. Mater. 1500273 (2016).

Achieving time-of-flight mobilities for amorphous organic semiconductors in a thin film transistor configuration

Cyrus Y.H. Chan, K.K. Tsung, W.H. Choi, S.K. So, Organic Electronics 14, 1351 (2013).

Can an organic phosphorescent dye act as a charge transporter?

W.H. Choi, C.H. Cheung, and S.K. So, Organic Electronics 11, 872-875 (2010).

General References

oe book

Organic electronics: materials, processing, devices and applications

S.C. Tse, C.H. Cheung, and S.K. So, F. So Ed.,

Chap. 3, CRC Press, Francis and Taylor (2010). 

Carrier trapping and scattering in amorphous organic hole transporter 

K.K. Tsung and S. K. So

APPLIED PHYSICS LETTERS 92, 103315 (2008).

Carrier transport and injection to Phenylamine-based hole transporters for OLEDs applications

S.C. Tse, K.K. Tsung and S. K. So

JOURNAL OF DISPLAY TECHNOLOGY 3, 225-232 (2007). 

Other References

(I) Organic solar cells

Impact of Solvent Additive on Carrier Transport in Polymer:Fullerene Bulk Heterojunction Photovoltaic Cell

Carr H.Y. Ho, Q. Dong, H. Yin, Winky W.K. Leung, Q. Yang, .K.H. Lee, S.W. Tsang, and S.K. So,

Advanced Materials Interfaces 2, 1500166 (2015).

Batch-to-Batch Variation of Polymeric Photovoltaic Materials: its Origin and Impacts on Charge Carrier Transport and Device Performances

Harrison Ka Hin Lee, Zhao Li, Iordania Constantinou, Franky So, Sai Wing Tsang, and Shu Kong So,

Advanced Energy Material 4, 1400768 (2014).

(II) Time of Flight

Carrier trapping and scattering in amorphous organic hole transporter

K.K. Tsung and S. K. So, 

APPLIED PHYSICS LETTERS 92, 103315 (2008). 

Electron transport in naphthylamine-based organic compounds

S.C. Tse, K.C. Kwok, and S.K. So, 

Appl. Phys. Lett. 89, Art. No. 262102 (2006). 

Hole transports in molecularly doped triphenylamine derivative

H.H. Fong, K.C. Lun, and S.K. So, 

Chem. Phys. Lett. 353, 407-413 (2002).

(III) Dark injection space-charge-limited-current

Role of electron blocking and trapping layers in transport characterization of a  photovoltaic polymer poly(3-hexylthiophene)

Harrison K.H. Lee, Kevin K.H. Chan, S.K. So, 

Organic Electronics 13,541-544 (2012).

Origin of enhanced hole injection in inverted organic devices with electron accepting interlayer

Cephas E. Small, Sai-Wing Tsang, Junji Kido, Shu Kong So, and Franky So,

Advanced Functional Materials 22, 3261-3266 (2012).

Role of air exposure in the improvement of injection efficiency of transition metal oxide/organic contact

C.H. Cheung, W.J. Song, and S.K. So,

Organic Electronics 11,89-94 (2010).

Polymeric conducting anode for small organic transporting molecules in dark injection experiments

S.C. Tse, S.W. Tsang, and S.K. So, 

J. Appl. Phys. 100, Art. No. 063708 (2006). 

(IV) Admittance spectroscopy

Charge Transport Study of Semiconducting Polymers and Their Bulk Heterojunction Blends by Capacitance Measurements

Kevin K. H. Chan, S. W. Tsang, Harrison K. H. Lee, F. So, S. K. So, 

JOURNAL OF POLYMER SCI., PART B: POLYMER PHYSICS, 000, 001-010 (2013).

Advantages of admittance spectroscopy over time-of-flight technique for studying dispersive charge transport  in an organic  semiconductor

K.K. Tsung and S.K. So,

J. Appl.Phys. 106, 083710 (2009).

Application of admittance spectroscopy to evaluate carrier mobility in organic charge transport materials

S.W. Tsang, S.K. So, and J.B. Xu,

J. Appl. Phys. 99, Art. No. 013706 (2006).

(V) Organic thin film transistors

Probing Bulk Transport, Interfacial Disorders, and Molecular Orientations of Amorphous Semiconductors in a Thin-Film Transistor Configuration

Wai-Yu Sit, Sin Hang Cheung, Cyrus Yiu Him Chan, Ka Kin Tsung, Sai Wing Tsang,and Shu Kong So,

Adv. Electron. Mater. 1500273 (2016).

Achieving time-of-flight mobilities for amorphous organic semiconductors in a thin film transistor configuration

Cyrus Y.H. Chan, K.K. Tsung, W.H. Choi, S.K. So,

Organic Electronics 14, 1351 (2013).

Can an organic phosphorescent dye act as a charge transporter?

W.H. Choi, C.H. Cheung, and S.K. So,

Organic Electronics 11, 872-875 (2010).