Control of the molecular orientation of a 2, 2′ -bithiophene-9,9- dioctylfluorene copolymer by laser annealing and subsequent enhancement of the field effect transistor characteristics

Korefumi Kubota, Takuji Kato, Chihaya Adachi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We controlled the orientation of a 2, 2′ -bithiophene-9,9- dioctylfluorene (F8T2) copolymer spin-coated film on a polycarbonate substrate using a laser-annealing technique and demonstrated an enhancement of the field-effect transistor characteristics. We used a semiconductor laser, having a lasing wavelength of λ=405 nm, with a small spot size of 400 nm. Using polarizing optical microscopy and x-ray diffraction analysis, we confirmed enhancement of the orientation of the molecular chains of F8T2, along the laser scanning direction. Following laser annealing, the field-effect hole mobility resulted in a value of μ=1.6× 10-3 cm2 /V s, which is about three times higher than that of the unannealed sample.

Original languageEnglish
Article number073303
JournalApplied Physics Letters
Volume95
Issue number7
DOIs
Publication statusPublished - Sep 1 2009

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laser annealing
copolymers
field effect transistors
molecular chains
augmentation
hole mobility
polycarbonates
lasing
x ray diffraction
semiconductor lasers
microscopy
scanning
wavelengths
lasers

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "We controlled the orientation of a 2, 2′ -bithiophene-9,9- dioctylfluorene (F8T2) copolymer spin-coated film on a polycarbonate substrate using a laser-annealing technique and demonstrated an enhancement of the field-effect transistor characteristics. We used a semiconductor laser, having a lasing wavelength of λ=405 nm, with a small spot size of 400 nm. Using polarizing optical microscopy and x-ray diffraction analysis, we confirmed enhancement of the orientation of the molecular chains of F8T2, along the laser scanning direction. Following laser annealing, the field-effect hole mobility resulted in a value of μ=1.6× 10-3 cm2 /V s, which is about three times higher than that of the unannealed sample.",
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AU - Kato, Takuji

AU - Adachi, Chihaya

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AB - We controlled the orientation of a 2, 2′ -bithiophene-9,9- dioctylfluorene (F8T2) copolymer spin-coated film on a polycarbonate substrate using a laser-annealing technique and demonstrated an enhancement of the field-effect transistor characteristics. We used a semiconductor laser, having a lasing wavelength of λ=405 nm, with a small spot size of 400 nm. Using polarizing optical microscopy and x-ray diffraction analysis, we confirmed enhancement of the orientation of the molecular chains of F8T2, along the laser scanning direction. Following laser annealing, the field-effect hole mobility resulted in a value of μ=1.6× 10-3 cm2 /V s, which is about three times higher than that of the unannealed sample.

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