Abstract
dc:description.abstractThis thesis presents 3 experimental investigations combined with the underlying theoret ical framework: chapter 6 details the efforts made to investigate lateral spin transport (LST) in metal phthalocyanines with the underlying theory explained in chapter 3. We present the full process of obtaining and characterising spintronics appropriate metal phthalocyanines and present the first ever room-temperature LST measurements on metal phthalocyanines. We furthermore present the most recent challenges and reason which experiments could be done next to improve the insight gained. Spin lifetime investigations in TIPS-pentacene and diF-TES-ADT are presented in chapter 7 and appendix A with chapter 4 detailing electron spin resonance and its use in spin lifetime studies. We present the full fabrication procedure to obtain ESR devices and ESR measure ments on spin-coated TIPS-pentacene. We furthermore yield insight into why diF-TES-ADT behaves in a more difficult way and how to potentially overcome this in the future in order to gain access to a small molecule of such high interest. We furthermore present the discovery of a electrode-grown morphology of TIPS-pentacene and diF-TES-ADT that are both able to span 100 µm channels or more and thus overcoming previously established limitations. Moreover, charge transport in donor-donor (d-d) polymers and donor-acceptor (d-a) poly mers is studied with results discussed in chapter 8 while the underlying theory is discussed in chapter 2. We study 4 d-d derivatives of the polymer IDT-BT that has gained much scientific interest and obtain their full transport characteristics together with their oxygen doping beha viour. We see that d-d derivatives behave significantly different to their d-a counterparts and can be grouped by certain sub-features within the d-d category. We see evidence that this is due to a lack of order in d-d derivatives which is most likely to be caused due to a lack of intra-molecular forces. Furthermore, we find a derivative that behaves very similar to IDT-BT in terms of mobility and other spectroscopic properties which is un-reported so far to the best of our knowledge.
Degree
thesis:*- Name dc:type.qualificationname
- Doctor of Philosophy (PhD)
- Level dc:type.qualificationlevel
- Doctoral
- Grantor dc:publisher.institution
- University of Cambridge
- Year dc:date.issued
- 2023
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Ursel, Sarah
- Advisor dc:contributor.advisor
-
- Sirringhaus, Henning
Subjects
dc:subject × 8Rights
dc:rightsIdentifiers
dc:identifier.*- DOI dc:identifier.doi
- https://doi.org/10.17863/CAM.102118
- OAI identifier oai:identifier
- oai:www.repository.cam.ac.uk:1810/358491