Investigation of fabricated tips­pentacene based organic diode using slide coating deposition technique

• Main Author: Fara Naila Rusnan
• Format: Thesis
• Language: English
• Published: 2019
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: https://eprints.ums.edu.my/id/eprint/25146/1/Investigation%20of%20fabricated%20tips%20pentacene%20based%20organic%20diode%20using%20slide%20coating%20deposition%20technique.pdf; https://eprints.ums.edu.my/id/eprint/25146/

Organic material is one of the most capable material to fit into any kinds of substrates as it gained recent popularity for being able to be deposited under low maintenance of manufacturing. The performances are still comparable with non-organic based electronics. The main purpose of this study is to investigate fabricated TIPS-pentacene based organic diode using slide coating deposition technique. Different alignment of deposition method such as dip coating, spin coating and slide coating were compared and used drop casting deposition technique as benchmark. Slide coating has the ability to control the direction of deposition and the drying area as it will influence the quality of device. Optimum condition for depositing TIPS-pentacene were also taken into account where 60 minutes duration used to furnace, and 0.2 weight percentage needed to achieve highly oriented molecular properties. Molecular orientation of slide coated deposition technique has sharp (0 0 1) peak at 5.33° with FWHM of 0.32. This result is comparable with drop casting where 2e angle is 5.27° and FWHM of 0.08. The measured 1-V characteristics of the organic diode show rectifying behaviour and non-symmetrical graph, thus the junction is non-ohmic. Extraction of organic diode parameter such as current density, J, turn-on voltage, Vr, saturation current, Io, barrier heights, {f)b, series resistance, Rs, and ideality factor, n, values at 1.33 x 10·7 A/cm2, 2.22V, 19.32 A, 4.61 x 10-1, 8.75 x 106Q and 18, respectively. Comparison research between chloroform and toluene solution to dilute TIPS-pentacene were also discussed in this study based on physical and electrical characterization, where toluene is the most suitable organic solvent to dilute TIPS-pentacene as it benefits more in both aspects compared to chloroform.