Growth conditions effects on morphology and transport properties of an oligothiophene semiconductor

Hajlaoui, Mohsen Elain; Garnier, F.; Hassine, L.; Kouki, Fayçal; Bouchriha, H.

doi:10.1016/s0379-6779(02)00040-1

Cited by 40 publications

(43 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pentacene films deposited at higher substrate temperature often consist of large grains [26]. The larger grain size forming at higher temperatures on OTS treated substrates is shown in the topography images in Fig.…”

Section: A Influence Of the Film Morphologymentioning

confidence: 82%

Threshold voltage shift in organic field effect transistors by dipole monolayers on the gate insulator

Pernstich

Rashid

Haas

et al. 2004

Journal of Applied Physics

531

492

View full text Add to dashboard Cite

We demonstrate controllable shift of the threshold voltage and the turn-on voltage in pentacene thin film transistors and rubrene single crystal field effect transistors (FET) by the use of nine organosilanes with different functional groups. Prior to depositing the organic semiconductors, the organosilanes were applied to the SiO2 gate insulator from solution and form a self assembled monolayer (SAM). The observed shift of the transfer characteristics range from -2 to 50 V and can be related to the surface potential of the layer next to the transistor channel. Concomitantly the mobile charge carrier concentration at zero gate bias reaches up to 4 × 10 12 /cm 2 . In the single crystal FETs the measured transfer characteristics are also shifted, while essentially maintaining the high quality of the subthreshold swing. The shift of the transfer characteristics is governed by the built-in electric field of the SAM and can be explained using a simple energy level diagram. In the thin film devices, the subthreshold region is broadened, indicating that the SAM creates additional trap states, whose density is estimated to be of order 1 × 10 12 /cm 2 .

show abstract

Section: A Influence Of the Film Morphologymentioning

confidence: 82%

Threshold voltage shift in organic field effect transistors by dipole monolayers on the gate insulator

Pernstich

Rashid

Haas

et al. 2004

Journal of Applied Physics

531

492

View full text Add to dashboard Cite

show abstract

“…Systematic studies realized with 6T and DH‐6T as active layers in OTFTs demonstrated that relatively high mobilities can be reached with polycrystalline organic films (µ = 0.002 cm 2 V −1 s −1 for 6T and µ = 0.050 cm 2 V −1 s −1 for DH‐6T) 15, 16. Higher charge carrier mobilities, as high as 0.33 cm 2 V −1 s −1 , have been reported for vacuum‐deposited films of unsubstituted 8T 17. Following these results, some strategies emerged to improve OTFT performance.…”

Section: Organic Semiconductorsmentioning

confidence: 95%

Organic transistors and phototransistors based on small molecules

Lucas

Trigaud

Videlot‐Ackermann

2011

Polymer International

View full text Add to dashboard Cite

International audienceSignificant advances have been made recently in the area of organic electronics and optoelectronics based on small molecules as a result of the synthesis of new soluble and air-stable molecules. First reported 20 years ago, organic transistors quickly became a focus of intense research and development in academic and industrial laboratories. The great progress achieved thus far offers an opportunity for the production of new small electro-active molecules and the implementation of low-cost device fabrication technologies. This review focuses on recently synthesized p- or n-type organic semiconductors, particularly those suitable for fabrication of solution-processed and/or air-stable field effect transistors with an emphasis on low-cost wet processes. The numerous recent efforts realized in optoelectronics, particularly on phototransistors based on small molecules, offer various opportunities in applications for such organic compounds. Copyright © 2011 Society of Chemical Industr

show abstract

“…This is contrary to the lack of correlation of mobility with conjugation length observed with the a-nThiophene (a-nT) series of molecules, where n ¼ 4, 6, and 8, namely the quarterthiophene, sexithiophene, and octithiophene molecules, respectively. [28,29] Garnier and co-workers conclude that increasing the oligomer length beyond a-4T does not result in any increase in mobility. [30] Locklin and co-workers also report no increase in mobility going from the phenyl-bithiophenephenyl series to the phenyl-terthiophene-phenyl series.…”

Section: Discussionmentioning

confidence: 99%

Functionalized Asymmetric Linear Acenes for High‐Performance Organic Semiconductors

Tang

Reichardt

Okamoto

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

A series of compounds from the tetraceno[2,3‐b]thiophene and the anthra[2,3‐b]thiophene family of semiconducting molecules has been made. Specifically, synthetic routes to functionalize the parent molecules with bromo and then hexyl groups are shown. The bromo‐ and hexyl‐functionalized tetraceno[2,3‐b]thiophene and anthra[2,3‐b]thiophene were characterized in the top‐contact thin‐film transistor (TFT) geometry. They give high mobilities, ranging from 0.12 cm2 V−1 s−1 for α‐n‐hexylanthra[2,3‐ b]thiophene to as high as 0.85 cm2 V−1 s−1 for α‐bromotetraceno[2,3‐b]thiophene. Notably, grain size increases, going from the shorter anthra[2,3‐b]thiophene core to the longer tetraceno[2,3‐b]thiophene core, with a corresponding increase in mobility. The transition from undesirable 3D to desirable 2D thin‐film growth is explained by the increase in length of the molecule, in this case by one benzene ring, which results in an increase in intralayer interactions relative to interlayer interactions.

show abstract

Growth conditions effects on morphology and transport properties of an oligothiophene semiconductor

Cited by 40 publications

References 8 publications

Threshold voltage shift in organic field effect transistors by dipole monolayers on the gate insulator

Threshold voltage shift in organic field effect transistors by dipole monolayers on the gate insulator

Organic transistors and phototransistors based on small molecules

Functionalized Asymmetric Linear Acenes for High‐Performance Organic Semiconductors

Contact Info

Product

Resources

About