Publications by Donal Bradley


Efficient Deep Red Light-Sensing All-Polymer Phototransistors with p-type/n-type Conjugated Polymer Bulk Heterojunction Layers.

ACS applied materials & interfaces 9 (2017) 14983-14989

S Nam, J Seo, H Han, H Kim, DDC Bradley, Y Kim

Here we demonstrate deep red light-sensing all-polymer phototransistors with bulk heterojunction layers of poly[4,8-bis[(2-ethylhexyl)-oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7) and poly[[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)] (P(NDI2OD-T2)). The device performances were investigated by varying the incident light intensity of the deep red light (675 nm), while the signal amplification capability was examined by changing the gate and drain voltages. The result showed that the present all-polymer phototransistors exhibited higher photoresponsivity (∼14 A/W) and better on/off photoswitching characteristics than the devices with the pristine polymers under illumination with the deep red light. The enhanced phototransistor performances were attributed to the well-aligned nanofiber-like morphology and nanocrystalline P(NDI2OD-T2) domains in the blend films, which are beneficial for charge separation and charge transport in the in-plane direction.


Polyacetylene-based polyelectrolyte as a universal interfacial layer for efficient inverted polymer solar cells

ORGANIC ELECTRONICS 48 (2017) 61-67

S Nam, J Seo, M Song, H Kim, M Ree, Y-S Gal, DDC Bradley, Y Kim


Organic phototransistors with all-polymer bulk heterojunction layers of p-type and n-type sulfur-containing conjugated polymers

IEEE Journal on Selected Topics in Quantum Electronics 22 (2016)

H Han, S Nam, J Seo, J Jeong, H Kim, H Kim, DDC Bradley, Y Kim

© 2015 IEEE. All-polymer phototransistors were fabricated using both glass and flexible plastic film substrates by employing bulk heterojunction channel layers of p-type polymer (P3HT) and n-type polymer (THBT-ht). The devices could detect the entire visible light because the n-type polymer could sense photons in the deep red parts (>650 nm). The responsivity of devices was higher at the lower light intensity, while it could be controlled by varying the gate and/or drain voltages. Similar performances were measured for flexible all-polymer phototransistors with a bottom-source/drain and top-gate electrode configuration.


Pronounced Cosolvent Effects in Polymer:Polymer Bulk Heterojunction Solar Cells with Sulfur-Rich Electron-Donating and Imide-Containing Electron-Accepting Polymers

ACS Applied Materials & Interfaces 7 (2015) 15995-16002

S Nam, S Woo, J Seo, WH Kim, H Kim, CR McNeill, TJ Shin, DDC Bradley, Y Kim


Copper thiocyanate: An attractive hole transport/extraction layer for use in organic photovoltaic cells

APPLIED PHYSICS LETTERS 107 (2015) ARTN 013301

ND Treat, N Yaacobi-Gross, H Faber, AK Perumal, DDC Bradley, N Stingelin, TD Anthopoulos


Efficient organic solar cells using copper(I) iodide (CuI) hole transport layers

APPLIED PHYSICS LETTERS 106 (2015) ARTN 243302

Y Peng, N Yaacobi-Gross, AK Perumal, HA Faber, G Vourlias, PA Patsalas, DDC Bradley, Z He, TD Anthopoulos


4H-1,2,6-Thiadiazin-4-one-containing small molecule donors and additive effects on their performance in solution-processed organic solar cells

JOURNAL OF MATERIALS CHEMISTRY C 3 (2015) 2358-2365

F Hermerschmidt, AS Kalogirou, J Min, GA Zissimou, SM Tuladhar, T Ameri, H Faber, G Itskos, SA Choulis, TD Anthopoulos, DDC Bradley, J Nelson, CJ Brabec, PA Koutentis


Dip-pen patterning of poly(9,9-dioctylfluorene) chain-conformation-based nano-photonic elements

Nature Communications 6 (2015) 5977-5977

A Perevedentsev, Y Sonnefraud, CR Belton, S Sharma, AEG Cass, SA Maier, J-S Kim, PN Stavrinou, DDC Bradley


High-Efficiency Organic Photovoltaic Cells Based on the Solution-Processable Hole Transporting Interlayer Copper Thiocyanate (CuSCN) as a Replacement for PEDOT:PSS

ADVANCED ENERGY MATERIALS 5 (2015) ARTN 1401529

N Yaacobi-Gross, ND Treat, P Pattanasattayavong, H Faber, AK Perumal, N Stingelin, DDC Bradley, PN Stavrinou, M Heeney, TD Anthopoulos


Solution-processed anthracene-based molecular glasses as stable blue-light-emission laser gain media

ORGANIC ELECTRONICS 18 (2015) 95-100

Q Niu, Q Zhang, W Xu, Y Jiang, R Xia, DDC Bradley, D Li, X Wen


High-Efficiency, Solution-Processed, Multilayer Phosphorescent Organic Light-Emitting Diodes with a Copper Thiocyanate Hole-Injection/Hole-Transport Layer

Advanced Materials 27 (2015) 93-100

A Perumal, H Faber, N Yaacobi-Gross, P Pattanasattayavong, C Burgess, S Jha, MA McLachlan, PN Stavrinou, TD Anthopoulos, DDC Bradley


Interplay Between Solid State Microstructure and Photophysics for Poly(9,9-dioctylfluorene) within Oriented Polyethylene Hosts

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS 53 (2015) 22-38

A Perevedentsev, S Aksel, K Feldman, P Smith, PN Stavrinou, DDC Bradley


Organic electronics and photonics: concluding remarks

Faraday Discuss. (2014)

DDC Bradley


Charge mobility anisotropy of functionalized pentacenes in organic field effect transistors fabricated by solution processing

JOURNAL OF MATERIALS CHEMISTRY C 2 (2014) 10110-10115

J Wade, F Steiner, D Niedzialek, DT James, Y Jung, D-J Yun, DDC Bradley, J Nelson, J-S Kim


Correlating Non-Geminate Recombination with Film Structure: A Comparison of Polythiophene: Fullerene Bilayer and Blend Films

The Journal of Physical Chemistry Letters 5 (2014) 3669-3676

S Shoaee, S Mehraeen, JG Labram, J-L Brédas, DDC Bradley, V Coropceanu, TD Anthopoulos, JR Durrant


Understanding the role of ultra-thin polymeric interlayers in improving efficiency of polymer light emitting diodes

JOURNAL OF APPLIED PHYSICS 115 (2014)

J Bailey, EN Wright, X Wang, AB Walker, DDC Bradley, J-S Kim


Advanced Ellipsometric Characterization of Conjugated Polymer Films

ADVANCED FUNCTIONAL MATERIALS 24 (2014) 2116-2134

M Campoy-Quiles, M Isabel Alonso, DDC Bradley, LJ Richter


Fluorene-based cathode interlayer polymers for high performance solution processed organic optoelectronic devices

ORGANIC ELECTRONICS 15 (2014) 1244-1253

W Xu, X Zhang, Q Hu, L Zhao, X Teng, W-Y Lai, R Xia, J Nelson, W Huang, DDC Bradley


Confined surface plasmon-polariton amplifiers.

Nano letters 13 (2013) 1323-1329

S Kéna-Cohen, PN Stavrinou, DD Bradley, SA Maier

We demonstrate the realization of confined surface plasmon polariton amplifiers using a thin layer of the organic gain medium 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran dispersed in a tris(8-hydroxy-quinolinato)aluminum matrix. Complete loss compensation, which occurs at a pump fluence of approximately 200 μJ/cm(2), is directly observed in the time domain and studied for a range of waveguide lengths. The power dependence is also reported, and a significant net gain of 93 dB/mm is observed at the highest fluence.


Location, Location, Location - Strategic Positioning of 2,1,3-Benzothiadiazole Units within Trigonal Quaterfluorene-Truxene Star-Shaped Structures

ADVANCED FUNCTIONAL MATERIALS 23 (2013) 2792-2804

CR Belton, AL Kanibolotsky, J Kirkpatrick, C Orofino, SET Elmasly, PN Stavrinou, PJ Skabara, DDC Bradley

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