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Title: Electric Field Tuning Molecular Packing and Electrical Properties of Solution-Shearing Coated Organic Semiconducting Thin Films

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [1];  [2];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
+ Show Author Affiliations

Recent improvements in solution-coated organic semiconductors (OSCs) evidence their high potential for cost-efficient organic electronics and sensors. Molecular packing structure determines the charge transport property of molecular solids. However, it remains challenging to control the molecular packing structure for a given OSC. Here, the application of alternating electric fields is reported to fine-tune the crystal packing of OSC solution-shearing coated at ambient conditions. First, a theoretical model based on dielectrophoresis is developed to guide the selection of the optimal conditions (frequency and amplitude) of the electric field applied through the solution-shearing blade during coating of OSC thin films. Next, electric field-induced polymorphism is demonstrated for OSCs with both herringbone and 2D brick-wall packing motifs in 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene and 6,13-bis(triisopropylsilylethynyl) pentacene, respectively. Favorable molecular packing can be accessible in some cases, resulting in higher charge carrier mobilities. In conclusion, this work provides a new approach to tune the properties of solution-coated OSCs in functional devices for high-performance printed electronics.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
P2ELP2_155355; SC0016523; FOA-0000654-1588; 1434799; AC02-76SF00515; DE‐SC0016523; DE‐FOA‐0000654‐1588
OSTI ID:
1353187
Alternate ID(s):
OSTI ID: 1401739
Journal Information:
Advanced Functional Materials, Vol. 27, Issue 8; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Micro-Layer and Lattice Structure Effects on Impedance of Titanium Oxide Phthalocyanine journal April 2018
Highly Crystalline C8-BTBT Thin-Film Transistors by Lateral Homo-Epitaxial Growth on Printed Templates journal October 2017
Addition of the Lewis Acid Zn(C 6 F 5 ) 2 Enables Organic Transistors with a Maximum Hole Mobility in Excess of 20 cm 2 V −1 s −1 journal May 2019
High-Mobility, Solution-Processed Organic Field-Effect Transistors from C8-BTBT:Polystyrene Blends journal June 2018
Enhancing Molecular Alignment and Charge Transport of Solution-Sheared Semiconducting Polymer Films by the Electrical-Blade Effect journal May 2018
Solution Shearing of a High‐Capacitance Polymer Dielectric for Low‐Voltage Organic Transistors journal April 2019
Gas Sensors Based on Nano/Microstructured Organic Field‐Effect Transistors journal February 2019
The meniscus-guided deposition of semiconducting polymers journal February 2018
Organic crystalline materials in flexible electronics journal January 2019
Laser-induced orientation transformation of a conjugated polymer thin film with enhanced vertical charge transport journal January 2018
Role of Polymorphism and Thin-Film Morphology in Organic Semiconductors Processed by Solution Shearing journal February 2018

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36 MATERIALS SCIENCE