Details

Autor(en) / Beteiligte

• Lee, Jungho
• Shin, Eun-Sol
• Kim, Yeon-Ju
• Noh, Yong-Young
• Yang, Changduk

Titel

Controlling the ambipolarity of thieno-benzo-isoindigo polymer-based transistors: the balance of face-on and edge-on populations

Ist Teil von

• Journal of materials chemistry. C, Materials for optical and electronic devices, 2020-01, Vol.8 (1), p.296-32

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In spite of its interesting 'asymmetric' polar cyclic amide structure combining the dual properties of isoindigo (IIG) and thieno-isoindigo, the recently formulated thieno-benzo-isoindigo (TBIG) has been less explored as a building block for organic electronic materials in conjugated polymers. This article introduces the results obtained on TBIG-based polymers ( PTBIG-100 , PTBIG-75 , PTBIG-50 , and PTBIG-25 ) having different ratios of TBIG and IIG accepting units and a bithiophene counterpart donor to highlight their fundamental characteristics in terms of the organic field-effect transistor (OFET) mobilities. Besides, an increase in the TBIG unit results in increased co-planarity, red-shifted absorption, and higher-lying highest occupied molecular orbital levels as well as higher face-on crystallite populations relative to edge-on ones. All the polymer-based OFETs exhibit ambipolar charge transport properties; PTBIG-100 adopting a highly face-on orientation exhibits the highest hole mobility of 0.13 cm 2 V −1 s −1 but rather low electron mobility, while the opposite is true for PTBIG-25 having a higher edge-on one. Besides, highly balanced hole and electron mobilities ( μ FET,h = 0.06 cm 2 V −1 s −1 and μ FET,e = 0.045 cm 2 V −1 s −1 ) are observed for PTBIG-75 with a similar population between face-on and edge-on textures. Analysis of the electrical and structural properties in this study demonstrates that the ratio of face-on and edge-on is a key factor in not only determining the dominant polarity, but also achieving balanced ambipolarity in OFETs. The asymmetric cyclic amide structure of thieno-benzo-isoindigo (TBIG) is introduced for the series of TBIG-based polymers, and their fundamental characteristics in terms of the organic field-effect transistor mobilities are investigated.