Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates

Leigh Fleming, Liam Blunt, David Robbins, Mohamed Elrawemi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper details findings from recent work undertaken as part of the EU funded NanoMend project. The aim of the project is to develop integrated process inspection, cleaning, repair and control systems for nano-scale thin films on large area substrates. The presence of surface irregularities on the uncoated film can induce "defects" within the, aluminium oxide, barrier layer, these features are in the order of magnitude of nanometres to a few microns. These "defects" are examined and quantitatively characterised. The measurements are carried out using a Taylor Hobson Coherence Correlation Interferometer an optical microscope and SEM. The efficient separation of small features from large features is achieved using data segmentation and feature parameter techniques. The presence of both large and small features is then correlated with the water vapour transmission rate as measured on representative sets of films using at standard MOCON (quantitative gas permeation) test. The paper concludes that, based on analysis of water vapour transmission rates (WVTR) and defect size that small numbers of large features have a more significant effect on the deterioration of water vapour transmission rates. It is the WVTR which indicates the potential longevity of the device as it is the effectiveness of this ALD barrier layer to water vapour which ensures the effective function of the core CIGS layers encapsulated in the device. The ability to measure and effectively characterise the features which are significant defects in the ALD barrier layers provides novel information to enable automatic detection and correction of potential restrictors to device performance in the processes.

Original languageEnglish
Title of host publicationLaser Metrology and Machine Performance X
Subtitle of host publication10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013
EditorsWolfgang Knapp, Liam Blunt
Publishereuspen
Pages59-68
Number of pages10
ISBN (Electronic)9780956679017
Publication statusPublished - 1 Mar 2013
Event10th International Conference and Exhibition on Laser Metrology, Coordinate Measuring Machine and Machine Tool Performance - Buckinghamshire, United Kingdom
Duration: 20 Mar 201321 Mar 2013
Conference number: 10

Conference

Conference10th International Conference and Exhibition on Laser Metrology, Coordinate Measuring Machine and Machine Tool Performance
Abbreviated titleLAMDAMAP 2013
CountryUnited Kingdom
CityBuckinghamshire
Period20/03/1321/03/13

Fingerprint

Water vapor
water vapor
coatings
Coatings
barrier layers
Substrates
Defects
defects
optical microscopes
irregularities
deterioration
Permeation
Interferometers
cleaning
Deterioration
inspection
Cleaning
Microscopes
Repair
interferometers

Cite this

Fleming, L., Blunt, L., Robbins, D., & Elrawemi, M. (2013). Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates. In W. Knapp, & L. Blunt (Eds.), Laser Metrology and Machine Performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013 (pp. 59-68). euspen.
Fleming, Leigh ; Blunt, Liam ; Robbins, David ; Elrawemi, Mohamed. / Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates. Laser Metrology and Machine Performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013. editor / Wolfgang Knapp ; Liam Blunt. euspen, 2013. pp. 59-68
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Fleming, L, Blunt, L, Robbins, D & Elrawemi, M 2013, Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates. in W Knapp & L Blunt (eds), Laser Metrology and Machine Performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013. euspen, pp. 59-68, 10th International Conference and Exhibition on Laser Metrology, Coordinate Measuring Machine and Machine Tool Performance, Buckinghamshire, United Kingdom, 20/03/13.

Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates. / Fleming, Leigh; Blunt, Liam; Robbins, David; Elrawemi, Mohamed.

Laser Metrology and Machine Performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013. ed. / Wolfgang Knapp; Liam Blunt. euspen, 2013. p. 59-68.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Elrawemi, Mohamed

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N2 - This paper details findings from recent work undertaken as part of the EU funded NanoMend project. The aim of the project is to develop integrated process inspection, cleaning, repair and control systems for nano-scale thin films on large area substrates. The presence of surface irregularities on the uncoated film can induce "defects" within the, aluminium oxide, barrier layer, these features are in the order of magnitude of nanometres to a few microns. These "defects" are examined and quantitatively characterised. The measurements are carried out using a Taylor Hobson Coherence Correlation Interferometer an optical microscope and SEM. The efficient separation of small features from large features is achieved using data segmentation and feature parameter techniques. The presence of both large and small features is then correlated with the water vapour transmission rate as measured on representative sets of films using at standard MOCON (quantitative gas permeation) test. The paper concludes that, based on analysis of water vapour transmission rates (WVTR) and defect size that small numbers of large features have a more significant effect on the deterioration of water vapour transmission rates. It is the WVTR which indicates the potential longevity of the device as it is the effectiveness of this ALD barrier layer to water vapour which ensures the effective function of the core CIGS layers encapsulated in the device. The ability to measure and effectively characterise the features which are significant defects in the ALD barrier layers provides novel information to enable automatic detection and correction of potential restrictors to device performance in the processes.

AB - This paper details findings from recent work undertaken as part of the EU funded NanoMend project. The aim of the project is to develop integrated process inspection, cleaning, repair and control systems for nano-scale thin films on large area substrates. The presence of surface irregularities on the uncoated film can induce "defects" within the, aluminium oxide, barrier layer, these features are in the order of magnitude of nanometres to a few microns. These "defects" are examined and quantitatively characterised. The measurements are carried out using a Taylor Hobson Coherence Correlation Interferometer an optical microscope and SEM. The efficient separation of small features from large features is achieved using data segmentation and feature parameter techniques. The presence of both large and small features is then correlated with the water vapour transmission rate as measured on representative sets of films using at standard MOCON (quantitative gas permeation) test. The paper concludes that, based on analysis of water vapour transmission rates (WVTR) and defect size that small numbers of large features have a more significant effect on the deterioration of water vapour transmission rates. It is the WVTR which indicates the potential longevity of the device as it is the effectiveness of this ALD barrier layer to water vapour which ensures the effective function of the core CIGS layers encapsulated in the device. The ability to measure and effectively characterise the features which are significant defects in the ALD barrier layers provides novel information to enable automatic detection and correction of potential restrictors to device performance in the processes.

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M3 - Conference contribution

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BT - Laser Metrology and Machine Performance X

A2 - Knapp, Wolfgang

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PB - euspen

ER -

Fleming L, Blunt L, Robbins D, Elrawemi M. Characterisation techniques to assess functional properties of barrier coatings for flexible PV substrates. In Knapp W, Blunt L, editors, Laser Metrology and Machine Performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM and Robotic Performance, LAMDAMAP 2013. euspen. 2013. p. 59-68