Donal Bradley: Publications

Broadband All-Polymer Phototransistors with Nanostructured Bulk Heterojunction Layers of NIR-Sensing n-Type and Visible Light-Sensing p-Type Polymers

Scientific Reports Springer Science and Business Media LLC 5:1 (2015) 16457

Authors:

Hyemi Han, Sungho Nam, Jooyeok Seo, Chulyeon Lee, Hwajeong Kim, Donal DC Bradley, Chang-Sik Ha, Youngkyoo Kim

Abstract:

AbstractWe report ‘broadband light-sensing’ all-polymer phototransistors with the nanostructured bulk heterojunction (BHJ) layers of visible (VIS) light-sensing electron-donating (p-type) polymer and near infrared (NIR) light-sensing electron-accepting (n-type) polymer. Poly[{2,5-bis-(2-ethylhexyl)-3,6-bis-(thien-2-yl)-pyrrolo[3,4-c]pyrrole-1,4-diyl}-co-{2,2′-(2,1,3-benzothiadiazole)]-5,5′-diyl}] (PEHTPPD-BT), which is synthesized via Suzuki coupling and employed as the n-type polymer, shows strong optical absorption in the NIR region (up to 1100 nm) in the presence of weak absorption in the VIS range (400 ~ 600 nm). To strengthen the VIS absorption, poly(3-hexylthiophene) (P3HT) is introduced as the p-type polymer. All-polymer phototransistors with the BHJ (P3HT:PEHTPPD-BT) layers, featuring a peculiar nano-domain morphology, exhibit typical p-type transistor characteristics and efficiently detect broadband (VIS ~ NIR) lights. The maximum corrected responsivity (without contribution of dark current) reaches up to 85 ~ 88% (VIS) and 26 ~ 40% (NIR) of theoretical responsivity. The charge separation process between P3HT and PEHTPPD-BT components in the highest occupied molecular orbital is proposed as a major working mechanism for the effective NIR sensing.

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Solution‐crystallization and related phenomena in 9,9‐dialkyl‐fluorene polymers. II. Influence of side‐chain structure

Journal of Polymer Science Part B Polymer Physics Wiley 53:21 (2015) 1492-1506

Authors:

Aleksandr Perevedentsev, Paul N Stavrinou, Paul Smith, Donal DC Bradley

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Solution‐crystallization and related phenomena in 9,9‐dialkyl‐fluorene polymers. I. Crystalline polymer‐solvent compound formation for poly(9,9‐dioctylfluorene)

Journal of Polymer Science Part B Polymer Physics Wiley 53:21 (2015) 1481-1491

Authors:

Aleksandr Perevedentsev, Paul N Stavrinou, Donal DC Bradley, Paul Smith

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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 American Chemical Society (ACS) 7:29 (2015) 15995-16002

Authors:

Sungho Nam, Sungho Woo, Jooyeok Seo, Wook Hyun Kim, Hwajeong Kim, Christopher R McNeill, Tae Joo Shin, Donal DC Bradley, Youngkyoo Kim

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

Applied Physics Letters AIP Publishing 107:1 (2015) 013301

Authors:

Neil D Treat, Nir Yaacobi-Gross, Hendrik Faber, Ajay K Perumal, Donal DC Bradley, Natalie Stingelin, Thomas D Anthopoulos

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Donal Bradley

Sub department

Broadband All-Polymer Phototransistors with Nanostructured Bulk Heterojunction Layers of NIR-Sensing n-Type and Visible Light-Sensing p-Type Polymers

Authors:

Abstract:

Solution‐crystallization and related phenomena in 9,9‐dialkyl‐fluorene polymers. II. Influence of side‐chain structure

Authors:

Solution‐crystallization and related phenomena in 9,9‐dialkyl‐fluorene polymers. I. Crystalline polymer‐solvent compound formation for poly(9,9‐dioctylfluorene)

Authors:

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

Authors:

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

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