Alison Walker (scientist)
{{Short description|Physicist and Professor}}
{{Infobox scientist
| name = Alison Walker
| image =
| caption = University of Bath faculty photo of Walker.
| workplaces = University of Bath
Michigan State University
University of East Anglia
Cambridge Display Technology
| alma_mater = University of Oxford
| thesis_title = Studies of disorder in fastionics and of a nuclear quadrupole interaction in ordered markets
| thesis_url = http://www.worldcat.org/oclc/229017488
| thesis_year = 1980
| website = [https://people.bath.ac.uk/pysabw/abwmod.html Device Modelling]
}}
Alison Bridget Walker is a physicist who is a professor at the University of Bath. Her research considers computational modelling of printed electronic devices and the development of perovskite solar cells. She is best known for her work on the Kinetic Monte Carlo method.
Early life and education
Walker was born in Sarawak.{{Citation needed|date=February 2021|reason=previously provided citation failed verification.}} She completed her undergraduate and postgraduate studies at the University of Oxford.{{Cite web|title=Alison Walker|url=https://theconversation.com/profiles/alison-walker-250762|access-date=2021-02-08|website=The Conversation|language=en}} Her doctoral research considered nuclear quadrupole interactions and fast ionic conductors.{{Cite Q| Q28911952|author=Walker, A. B. (Alison Bridget)}} After earning her doctorate, Walker moved to the United States, where she joined Michigan State University as a postdoctoral fellow. She moved to the Daresbury Laboratory as a research fellow.{{cn|date=February 2021}}
Research and career
Walker started her independent scientific career at the University of East Anglia.{{Cite web|title=Alison Walker Home Page|url=https://people.bath.ac.uk/pysabw/|access-date=2021-02-08|website=people.bath.ac.uk|language=en-US}} She joined the University of Bath in 1998, where she was awarded a Royal Society Industry Fellowship to work at Cambridge Display Technology.
At Bath, Walker is a team leader for the Centre of Excellence, EoCoE (Energy Oriented Centre of excellence, 2015-2018)] Walker works alongside Saiful Islam and Rob Scheichl, who are also funded by the EoCoE. Walker is the Academic Director for the Centre for Doctoral Training in New Sustainable PV (CDT-PV). This council is funded by the EPSRC, which has 7 universities and is headed by Ken Durose at the University of Liverpool.
Walker has developed kinetic Monte Carlo (KMC) approaches to better understand the electronic processes of printed electronic devices. In particular, she has considered photovoltaics and light emitting diodes (LEDs). Several different electronic processes take place in these devices, such as charge injection, the formation of excitons (bound electron – hole pairs), charge and exciton migration, and charge recombination/separation (dissociation). The KMCs developed by Walker take into account the complex three-dimensional morphology of the organic active layer and allow for investigations into how device architectures impact device performance. Beyond KMCs, Walker has developed drift-diffusion models to understand the movement of charge and energy in one-dimension.
In her efforts to understand the mechanisms that underpin device operation in OFETs, OLEDs and OPVs, Walker uses optical models that solve Maxwell's equations. These equations can be used to understand the variations in fields associated with photon absorption and generation. Such models can be used to understand the luminance, quantum efficiencies and current-voltage characteristics. A combination of the three models can be used to identify and optimize the positions of the dissociation and recombination zones.{{Cite web|title=CDTPV|url=https://www.cdt-pv.org/|access-date=2021-02-08|website=www.cdt-pv.org}} In 2013 Walker was made Academic Director of the Centre for Doctoral Training in New and Sustainable Photovoltaics, as well as co-leading the University of Bath SuperSolar network.{{Cite web|title=SUPERGEN SuperSolar|url=https://www.supersolar-hub.org/|access-date=2021-02-08|language=en-GB}}
Walker has worked with Petra Cameron to investigate perovskite solar cells, hybrid devices that contain organic and inorganic materials. The active layers of these devices contain perovskite crystal structures, which strongly absorb solar radiation. Electrons within the perovskite are excited across the material bandgap, creating mobile charge carriers that migrate to electron and hole transport layers. Walker was made coordinator of the Horizon 2020 program making perovskite truly exploitable (Maestro).{{Cite web|title=MAESTRO - The European Training Network|url=https://maestro-itn.eu/|access-date=2021-02-08|website=MAESTRO - The European Training Network|language=en}} Walker has created protein simulations to understand the structure and function of biologically-relevant molecules.
Selected publications
{{Scholia|author}}
- {{Cite Q|Q46386309}}
- {{Cite Q|Q59463302}}
- {{Cite Q|Q51356005}}
References
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Category:Year of birth missing (living people)
Category:21st-century women physicists