Study of semi-polar and non-polar nitride based structures for opto-electronic device applications
Lead Research Organisation:
University of Cambridge
Department Name: Materials Science & Metallurgy
Abstract
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
Publications
Badcock T
(2012)
Recombination mechanisms in heteroepitaxial non-polar InGaN/GaN quantum wells
in Journal of Applied Physics
Zhu T
(2012)
Unintentional doping in GaN.
in Physical chemistry chemical physics : PCCP
Oehler F
(2013)
Surface morphology of homoepitaxial c-plane GaN: Hillocks and ridges
in Journal of Crystal Growth
Zhu T
(2013)
Non-polar (11-20) InGaN quantum dots with short exciton lifetimes grown by metal-organic vapor phase epitaxy
in Applied Physics Letters
Oehler F
(2013)
Fundamentals of X-ray Diffraction Characterisation of Strain in GaN Based Compounds
in Japanese Journal of Applied Physics
Oehler F
(2013)
Alloy content determination of fully strained and partially relaxed semi-polar group III-nitrides by x-ray diffraction
in Journal of Applied Physics
Massabuau F
(2013)
Correlations between the morphology and emission properties of trench defects in InGaN/GaN quantum wells
in Journal of Applied Physics
Zhu T
(2013)
Defect Reduction in Semi-Polar (112¯2) Gallium Nitride Grown Using Epitaxial Lateral Overgrowth
in Japanese Journal of Applied Physics
Griffiths J
(2014)
Growth of non-polar (11-20) InGaN quantum dots by metal organic vapour phase epitaxy using a two temperature method
in APL Materials
Reid B
(2014)
Observations of Rabi oscillations in a non-polar InGaN quantum dot
in Applied Physics Letters
| Description | We have found that the growth of InGaN QWs on sapphire can result in prohibitively high densities of defects that limit the polarisation properties of non polar LEDs. This problem can be overcome by growth on GaN substrates leading to very strongly linearly polarised light. Different non-polar planes have surprisingly different optical properties however. We have performed the first atom probe tomography investigation of non-polar quantum wells in order to investigate this issue, and found startling evidence for non-random indium clustering in InGaN quantum wells. We have also shown that a phenomenon of efficiency droop, whereby LED efficiency drops as current increases, occurs in non-polar nitrides at similar carrier densities to those at which it occurs in polar nitrides, suggesting that the droop phenomenon is intrinsic and not a product of the electric fields. |
| Exploitation Route | Our work has resulted in improved understanding of the issues facing the growth of non and semi polar QWs on non native substrates. Following on from our successful fabrication of non polar InGaN QWs we are currently testing the design of a polarised light LED, which could be incorporated into display technologies, as a low energy solution. |
| Sectors | Digital/Communication/Information Technologies (including Software),Electronics,Environment |
| Description | DCMS: Compound Semiconductors: Industry & Academia Roundtable |
| Geographic Reach | National |
| Policy Influence Type | Participation in a guidance/advisory committee |
| Description | EPSRC/Innovate UK Semiconductor Roundtable |
| Geographic Reach | National |
| Policy Influence Type | Contribution to a national consultation/review |
| Description | FCDO UK Semiconductor Sector Visit to Washington DC |
| Geographic Reach | Multiple continents/international |
| Policy Influence Type | Contribution to a national consultation/review |
| Description | Institute of Physics / Royal Academy of Engineering Roundtable: UK Semiconductor Challenges and Solutions |
| Geographic Reach | National |
| Policy Influence Type | Contribution to a national consultation/review |
| URL | https://raeng.org.uk/media/2hmbvzke/0402_semi-conductor-report_v2.pdf |
| Description | Royal Academy of Engineering: Exploring the UK semiconductor innovation system workshop |
| Geographic Reach | National |
| Policy Influence Type | Contribution to a national consultation/review |
| URL | https://raeng.org.uk/media/rm1hck2o/raeng-exploring-the-uk-semiconductor-innovation-system.pdf |
| Description | A National Research Facility for Epitaxy |
| Amount | £12,250,478 (GBP) |
| Funding ID | EP/X015300/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 06/2022 |
| End | 06/2027 |
| Description | EPSRC Responsive Mode |
| Amount | £497,100 (GBP) |
| Funding ID | EP/M011682/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 01/2015 |
| End | 12/2017 |
| Description | EPSRC Responsive Mode |
| Amount | £467,349 (GBP) |
| Funding ID | EP/M012379/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 02/2015 |
| End | 01/2018 |
| Description | Simulation software for modelling nitride-based quantum light sources |
| Amount | £88,759 (GBP) |
| Funding ID | EP/R04502X/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 03/2018 |
| End | 02/2019 |
| Title | XRD determination of alloy content semipolar nitride layer |
| Description | New method to compute the alloy content of InGaN of AlGaN material by X-ray diffraction. |
| Type Of Material | Improvements to research infrastructure |
| Year Produced | 2013 |
| Provided To Others? | Yes |
| Impact | Allow correct alloy content to be computed, thus modelling of quantum well can be done accurately and the theory can be tested appropriately. |
| URL | http://dx.doi.org/10.1063/1.4817422 |
| Title | Research data supporting "Local carrier recombination and associated dynamics in m-plane InGaN/GaN quantum wells probed by picosecond cathodoluminescence" |
| Description | Research data in support of the publication "Local carrier recombination and associated dynamics in m-plane InGaN/GaN quantum wells probed by picosecond cathodoluminescence". We have included the original data (tab-separated text files) as plotted for the quantum wells, measured by spatially- and time-resolved cathodoluminescence. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2016 |
| Provided To Others? | Yes |
| Description | Tyndall |
| Organisation | University College Cork |
| Department | Tyndall National Institute |
| Country | Ireland |
| Sector | Academic/University |
| PI Contribution | Provision of data on the structural and optical properties of non and semi-polar quantum wells |
| Collaborator Contribution | Theoretical modelling of non- and semi-polar quantum wells |
| Impact | Publication: DOI: 10.1063/1.4868692 |
| Start Year | 2010 |
| Description | Cambridge ICE - Little Lights with Big Ideas |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Public/other audiences |
| Results and Impact | This talk was delivered as part of an online adult education programme provide by the Cambridge Insitute of Continuing Education, intended to provide free enrichment activities for the general public during the pandemic. |
| Year(s) Of Engagement Activity | 2020 |
| Description | Cambridge Science Festival 2015 |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | Over 100 people attended an interactive talk which sparked questions and discussions afterwards. The science festival had positive feedback that attendees enjoyed the event and we have been asked to put on a larger event in 2016. |
| Year(s) Of Engagement Activity | 2015 |
| URL | http://www.sciencefestival.cam.ac.uk/about/past-festivals/2015-cambridge-science-festival |
| Description | Chesterton Science Club (Communication using Light) |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | Local |
| Primary Audience | Schools |
| Results and Impact | An interactive talk on "Communication using Light" was delivered to the Chesterton Community College Science Club, incorporating elements on LiFi using LEDs and quantum communication using single photon sources. |
| Year(s) Of Engagement Activity | 2016 |
| Description | Crystal structure activities |
| Form Of Engagement Activity | Engagement focused website, blog or social media channel |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Schools |
| Results and Impact | A set of downloadable activities to allow users to build their own crystal structures and understand the properties of crystals. |
| Year(s) Of Engagement Activity | 2018 |
| URL | https://www.gan.msm.cam.ac.uk/resources/crystalmodels |
| Description | EPSRC Stand - Big Bang |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | Yes |
| Geographic Reach | National |
| Primary Audience | Schools |
| Results and Impact | Many school children increased their awareness of energy efficiency issues This activity was coordinated by the EPSRC and they would be more able to comment on such impacts. |
| Year(s) Of Engagement Activity | 2013 |
| Description | EPSRC Stand - Cheltenham |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | Yes |
| Geographic Reach | National |
| Primary Audience | Schools |
| Results and Impact | Many school children had increased awareness of energy efficiency issues. This activity was coordinated by the EPSRC, who would be more able to comment on this than me. |
| Year(s) Of Engagement Activity | 2013 |
| Description | EYFS and KS1 workshops at Cambridge Science Festival |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | Local |
| Primary Audience | Public/other audiences |
| Results and Impact | A series of workshops on light and electricity was held for early years foundation stage and key stage 1 children as part of the Cambridge Science Festival. This sparked discussion with the children's parents also. This series of workshops will be repeated at Cambridge Science Festival this year and in local schools. |
| Year(s) Of Engagement Activity | 2016 |
| Description | GaN Group Stand - Cheltenham |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | Yes |
| Geographic Reach | National |
| Primary Audience | Schools |
| Results and Impact | Many schoolchildren have increased awareness of energy efficiency issues and enjoyed an opportunity to experience some simple lab work. Visitors mentioned that the information on energy efficient lighting might change what light bulbs they would buy. This may result in changed buying patterns and decreased energy usage. |
| Year(s) Of Engagement Activity | 2014 |
| Description | Researcher profiles website |
| Form Of Engagement Activity | Engagement focused website, blog or social media channel |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Schools |
| Results and Impact | A website has been set up with career profiles for members of the Cambridge Gallium Nitride Centre as a resource for school and University students considering a career in research. |
| Year(s) Of Engagement Activity | 2016,2017 |
| URL | http://www.gan.msm.cam.ac.uk/resources/profiles |
| Description | Robinson Science Residential |
| Form Of Engagement Activity | Participation in an open day or visit at my research institution |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Schools |
| Results and Impact | Approximately 40 sixth formers took part in a 2 day even at Robinson College to which I contributed a talk, tutorial content and a practical session. Robinson reported increased student applications in related subject areas. |
| Year(s) Of Engagement Activity | 2015 |
| URL | https://www.robinson.cam.ac.uk/access-and-outreach |
| Description | Robinson Women in Science Festivale |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Schools |
| Results and Impact | Over 120 female sixth formers took part in a day festival aimed at encouraging participation in the Physical Sciences. In addition to organising the day, I gave a presentation on my research, chaired a student talk session and organised a practical session. Feedback from the sixth formers was very positive, several have been influenced to apply to study science at University and a second event is being organised. |
| Year(s) Of Engagement Activity | 2015 |
| URL | https://www.robinson.cam.ac.uk/access-and-outreach |
| Description | Science festival talk (How Can GaN Change Your Life?) |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Public/other audiences |
| Results and Impact | An interactive talk was delivered to a large audience at the Cambridge Science Festival, outlinging a number of different uses for Gallium Nitride from lighting to quantum communications. |
| Year(s) Of Engagement Activity | 2016 |
| Description | Talk to visiting school group (Communications using light) |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Schools |
| Results and Impact | An interactive talk on "Communication using Light" was delivered to a group of sixth formers visiting the department, incorporating elements on LiFi using LEDs and quantum communication using single photon sources. |
| Year(s) Of Engagement Activity | 2016 |