for thin-film materials and devices - vacuum-uk.org · aja phase ii-j multi-source rf sputtering...
TRANSCRIPT
![Page 1: for thin-film materials and devices - vacuum-uk.org · AJA Phase II-J Multi-source RF sputtering system ... SnO2 TiO2 SiO2 Al2O3 Ta2O5 Nb2O5 V2O5 V2O3 ZrO2 ZnS CdTe ZnTe CdSe ZnSe](https://reader031.vdocuments.us/reader031/viewer/2022022117/5c8f11bc09d3f22c798c18d2/html5/thumbnails/1.jpg)
Rapid optimisation techniquesfor thin-film materials and devices
Robert TreharneFunctional Thin Films16th October, Coventry
@robtreharne
slideshare.net/RobertTreharne
![Page 2: for thin-film materials and devices - vacuum-uk.org · AJA Phase II-J Multi-source RF sputtering system ... SnO2 TiO2 SiO2 Al2O3 Ta2O5 Nb2O5 V2O5 V2O3 ZrO2 ZnS CdTe ZnTe CdSe ZnSe](https://reader031.vdocuments.us/reader031/viewer/2022022117/5c8f11bc09d3f22c798c18d2/html5/thumbnails/2.jpg)
Rapid optimisation techniquesfor thin-film materials and devices
Robert TreharneFunctional Thin Films16th October, Coventry
@robtreharne
slideshare.net/RobertTreharne
![Page 3: for thin-film materials and devices - vacuum-uk.org · AJA Phase II-J Multi-source RF sputtering system ... SnO2 TiO2 SiO2 Al2O3 Ta2O5 Nb2O5 V2O5 V2O3 ZrO2 ZnS CdTe ZnTe CdSe ZnSe](https://reader031.vdocuments.us/reader031/viewer/2022022117/5c8f11bc09d3f22c798c18d2/html5/thumbnails/3.jpg)
Rapid optimisation techniquesfor thin-film materials and devices
Robert TreharneFunctional Thin Films16th October, Coventry
@robtreharne
slideshare.net/RobertTreharne
![Page 5: for thin-film materials and devices - vacuum-uk.org · AJA Phase II-J Multi-source RF sputtering system ... SnO2 TiO2 SiO2 Al2O3 Ta2O5 Nb2O5 V2O5 V2O3 ZrO2 ZnS CdTe ZnTe CdSe ZnSe](https://reader031.vdocuments.us/reader031/viewer/2022022117/5c8f11bc09d3f22c798c18d2/html5/thumbnails/5.jpg)
Outline
1) Capabilities
2) What I mean by “Combinatorial”
3) Case Study: Transparent Conductors
4) Other Applications
5) Other cool stuff
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AJA Phase II-JMulti-source RF sputtering systemZnOSnO2TiO2SiO2Al2O3
Ta2O5Nb2O5V2O5V2O3ZrO2
ZnSCdTeZnTeCdSeZnSe
CdSSb2Te3As2Te3
GeZnNbTeSn
AgTiAlCuBi
MgO
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Optical Characterisation● UV-VIS-IR (250 – 2000 nm): Shimadzu
● Variable Angle Ellipsometry: Woollam
● Both units have scanning capabilities
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Electrical Characterisation● Hall Effect – carrier conc & mobility
● 4PP – Sheet resistance – Scanning!
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Shhh! Don't say the C-word“Combinatorial” is sometimes a code term used to describe uncontrolled non-uniform deposition.
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Controlled Non-Uniformity● Profile from each gun described by 2D gaussian● Excellent control over deposition parameters● High run-to-run reproducibility● Can predict multi-gun profiles
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Case Study: Transparent Conductors● Essential materials for PV and consumer electronics● Combinatorial doping study: Si doped ZnO● Sample hundreds of compositions in a single sample● Mapping opto-electronic properties vs dopant composition● Extrapolation!
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Can do this in 1 day(that's a big deal)
Can also extract some fundamental physics
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Going deep!● Effective Mass – dependent on dopant conc.● Transport mechanisms: Scattering – new physical models!● Electronic structure: Shape of conduction band● ALL WITH ONE CONSISTENT SAMPLE!
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Further ApplicationsOptimising Thin-Film PV CdTe, CZTS, perovskites
Transparent Electronics ZnO TFTs
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Example: Cd(1-x)ZnxS layers for CdTe TFPV● Can investigate x = 0.1 – 0.7 in one device● Mapping performance with respect to x● Optimum x~0.6 identified● Improvement in Voc identified● Highly consistent data sets
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Recently presented at 40th IEEE PVSC Colorado
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Other StuffFilm S.T.A.R Thin-film optical database Multi-layer modelling Currently developing public webapp
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Perovskite!● Ellipsometry of perovskite film● n and k extracted● Multi-layer model to determine
optimum thickness for device
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Other StuffRecent breakthroughs MgCl2 activation of CdTe solar cells No need for toxic CdCl2
CdTe: Old dog, new tricks!
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EPSRC CDT in PhotovoltaicsStarts in November! 8m investment£ 7 University partners 65 PhD students Publically available resources
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Rapid optimisation techniquesfor thin-film materials and devices
Robert TreharneFunctional Thin Films16th October, Coventry
@robtreharne
slideshare.net/RobertTreharne