Effect of Crystallization Modes in TIPS-pentacene/Insulating Polymer Blends on the Gas Sensing Properties of Organic Field-Effect Transistors

• DOI: 10.1038/s41598-018-36652-1
• Publication Date: 2019-01-04T09:01:07Z
• Authors: Jung Hun Lee; Yena Seo; Yeong Don Park; John E. Anthony; Do Hun Kwak; Jung Ah Lim; Sunglim Ko; Ho Won Jang; Kilwon Cho; Wi Hyoung Lee
• Keywords: Pentacene; Organic semiconductor; Spin Coating; Organic Electronics

Blending organic semiconductors with insulating polymers has been known to be an effective way overcome the disadvantages of single-component for high-performance field-effect transistors (OFETs). We show that when a solution processable semiconductor (6,13-bis(triisopropylsilylethynyl)pentacene, TIPS-pentacene) is blended polymer (PS), morphological and structural characteristics blend films could significantly influenced by processing conditions like spin coating time. Although vertical phase-separated structures (TIPS-pentacene-top/PS-bottom) were formed on substrate regardless time, time governed growth mode TIPS-pentacene molecules crystallized polymer. Excess residual solvent in samples spun short duration induces convective flow drying droplet, thereby leading one-dimensional (1D) crystals. In contrast, after appropriate spin-coating optimum amount film led two-dimensional (2D) The 2D spherulites are extremely advantageous improving mobility FETs compared needle-like 1D structures, because high surface coverage crystals unique continuous structure. addition, porous structure observed crystalline allows gas easily penetrate into channel region, sensing properties.