Makale detayı · 2017
A Solution-Processable Liquid-Crystalline Semiconductor for Low-Temperature-Annealed Air-Stable N-Channel Field-Effect Transistors
- Yıl
- 2017
- ISSN
1439-4235- Tür
- article
Veri kaynağı ayrımı
- YÖKSİS YÖKSİS makale kaydı
- OpenAlex OpenAlex zenginleştirmesi (özet, atıf, konular)
Özet
İngilizce (OpenAlex)
Abstract A new solution‐processable and air‐stable liquid‐crystalline n‐channel organic semiconductor (2,2′‐(2,8‐bis(5‐(2‐octyldodecyl)thiophen‐2‐yl)indeno[1,2‐b]fluorene‐6,12‐diylidene)dimalononitrile, α,ω‐2OD‐TIFDMT) with donor–acceptor–donor (D‐A‐D) π conjugation has been designed, synthesized, and fully characterized. The new semiconductor exhibits a low LUMO energy (−4.19 eV) and a narrow optical bandgap (1.35 eV). The typical pseudo‐focal‐conic fan‐shaped texture of a hexagonal columnar liquid‐crystalline (LC) phase was observed over a wide temperature range. The spin‐coated semiconductor thin films show the formation of large (≈0.5–1 μm) and highly crystalline platelike grains with edge‐on molecular orientations. Low‐temperature‐annealed (50 °C) top‐contact/bottom‐gate OFETs have provided good electron mobility values as high as 0.11 cm2 (V s)−1 and high Ion/Ioff ratios of 107 to 108 with excellent ambient stability. This indicates an enhancement of two orders of magnitude (100×) when compared with the β‐substituted parent semiconductor, β‐DD‐TIFDMT (2,2′‐(2,8‐bis(3‐dodecylthiophen‐2‐yl)indeno[1,2‐b]fluorene‐6,12‐diylidene)dimalononitrile). The current rational alkyl‐chain engineering route offers great advantages for D‐A‐D π‐core coplanarity in addition to maintaining good solubility in organic solvents, and leads to favorable optoelectronic/physicochemical characteristics. These remarkable findings demonstrate that α,ω‐2OD‐TIFDMT is a promising semiconductor material for the development of n‐channel OFETs on flexible plastic substrates and LC‐state annealing of the columnar liquid crystals can lower the electron mobility for transistor‐type charge transport.
Konular
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Liquid Crystal Research Advancements
Birincil konu Organic Electronics and Photovoltaics