Self-assembled monolayers in organic electronics
PhD ceremony: Ms. F. Gholamrezaie, 16.15 uur, Academiegebouw, Broerstraat 5, Groningen
Dissertation: Self-assembled monolayers in organic electronics
Promotor(s): prof. D.M. de Leeuw, prof. P.W.M. Blom
Faculty: Mathematics and Natural Sciences
In recent years organic semiconductors have attracted considerable attention for application in electronic devices such as solar cells, light-emitting diodes and field-effect transistors. The advantages of the use of polymers are their unique electrical and mechanical properties and the opportunity to produce low-cost electronics on large area substrate such as glass and plastic.
A promising technology for organic electronics is bottom-up self-assembled monolayer (SAM), where molecules self-organize into complex patterns and structures without human intervention. Despite being only a single molecular layer thick, the SAM can change the macroscopic mechanical and electrical properties of surfaces. SAMs are applied onto the metal electrodes to tune the work function. The charge injection into the semiconductor can be enhanced or suppressed. Controlling the threshold voltage in OFETs can be done by SAMs. SAMs made from conjugated molecules can act as semiconducting layers in an OFET, it is shown that monolayer OFETs can surprisingly be made by simple spin coating. The mobility of the semiconductor is comparable with that of a bulk layer of the same material. The SAMFETs can also made by solution process. The SAMFETs made with SiO2 as the gate dielectric cannot be used for flexible electronics as the substrate is not bendable. The fully functional circuits demonstrate long-range order over large areas of a bare polymer surface, which can be regarded as the start of flexible monolayer electronics is the main report of this thesis.
Last modified: | 13 March 2020 12.59 a.m. |
More news
-
13 May 2024
‘The colourful cells of petals never get boring!’
Most people will enjoy colours in nature. However, the interest of evolutionary biologist Casper van der Kooi goes much further: he studies how flowers, birds, butterflies, and beetles get their colours. He also studies how these colours are used...
-
13 May 2024
Trapping molecules
In his laboratory, physicist Steven Hoekstra is building an experimental set-up made of two parts: one that produces barium fluoride molecules, and a second part that traps the molecules and brings them to an almost complete standstill so they can...
-
07 May 2024
Lecture with soon to be Honorary Doctor Gerrit Hiemstra on May 24
In celebration of his honorary doctorate, FSE has invited Hiemstra to give a lecture entitled ‘Science, let's talk about it’ on the morning of 24 May