%0 Journal Article %1 ADFM:ADFM201605503 %A Molina-Lopez, Francisco %A Yan, Hongping %A Gu, Xiaodan %A Kim, Yeongin %A Toney, Michael F. %A Bao, Zhenan %D 2017 %J Advanced Functional Materials %K mobility organics printing %P n/a--n/a %R 10.1002/adfm.201605503 %T Electric Field Tuning Molecular Packing and Electrical Properties of Solution-Shearing Coated Organic Semiconducting Thin Films %U http://dx.doi.org/10.1002/adfm.201605503 %X 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-dioctyl1benzothieno3,2-b1benzothiophene and 6,13-bis(triisopropylsilylethynyl) pentacene, respectively. Favorable molecular packing can be accessible in some cases, resulting in higher charge carrier mobilities. This work provides a new approach to tune the properties of solution-coated OSCs in functional devices for high-performance printed electronics.

@article{ADFM:ADFM201605503, abstract = {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. This work provides a new approach to tune the properties of solution-coated OSCs in functional devices for high-performance printed electronics.}, added-at = {2017-01-18T09:37:05.000+0100}, author = {Molina-Lopez, Francisco and Yan, Hongping and Gu, Xiaodan and Kim, Yeongin and Toney, Michael F. and Bao, Zhenan}, biburl = {https://www.bibsonomy.org/bibtex/251a0c12eacd433ae9fcb16e483a3e7ef/cgoehler}, description = {similar to Prof. Mansfelds work}, doi = {10.1002/adfm.201605503}, interhash = {86c6cfb756d53684f4d54803a8ca0b78}, intrahash = {51a0c12eacd433ae9fcb16e483a3e7ef}, issn = {1616-3028}, journal = {Advanced Functional Materials}, keywords = {mobility organics printing}, pages = {n/a--n/a}, timestamp = {2017-01-18T09:37:05.000+0100}, title = {Electric Field Tuning Molecular Packing and Electrical Properties of Solution-Shearing Coated Organic Semiconducting Thin Films}, url = {http://dx.doi.org/10.1002/adfm.201605503}, year = 2017 }