MKS Instruments GLM-2000 measures photoconductance in c-Si wafers

Share on facebook
Facebook
Share on twitter
Twitter
Share on linkedin
LinkedIn
Share on reddit
Reddit
Share on email
Email

MKS Instruments has introduced the GLM-2000 PV and Silicon Wafer Monitor for quality control in photovoltaic and crystalline silicon wafer processing for solar applications. The multi-function GLM-2000 uses a unique, high speed, non-contact RF detection technology to measure photoconductance in PV and silicon feedstocks and partially processed cells, either in-process or post-process.

Problem

The quality of silicon used for crystal silicon PV cells has a direct influence on the quality, or conversion efficiency, of the final product. The objective is to transfer as much of the incoming energy, or carriers, to the output of the circuit or cell. This is achieved, in part, by minimizing any recombination of the carriers. Carriers recombine when they come in touch with defects or impurities in the silicon. Recombination reduces the potential output current from the cell.

Solution

Measuring minority carrier lifetime is a way to quantitatively assess the quality of the base silicon, since lower minority carrier lifetime is an indication of impurities and defects in the silicon. Additionally, measuring sheet resistance and Photoconductance Decay (PCD) give further information on surface recombination effects and the quality of the PV cell manufacturing process from as-cut inspection through ARC deposition.
The GLM-2000 metrology tool employs a novel implementation of the current RFPCD measurement technique to instantaneously measure sheet resistance, minority carrier lifetime (Gtau), photoconductance decay (PCD), and photoconductance rise (PCR), key quality control parameters for PV processing. The GLM-2000 employs a programmable LED array that permits measurements at different light intensities, allowing the user to determine the true steady state minority carrier lifetimes. The use of LEDs also allows flexibility in the choice of light color and this can be useful in distinguishing surface effects from bulk characteristics.

Applications

High accuracy monitoring using True Steady State (Gtau) provides detection of changes in lifetime caused by crystal imperfections and impurities and a simple, deterministic value for c-Si or poly-Si quality and for recombination lifetimes. Photoconductance Rise (PCR) and Photoconductance
Decay (PCD) measurements are used to detect standard changes in lifetime of partially fabricated solar cells (pre-metallization). Comparing PCR to PCD signals to distinguish shallow trapping effect that happen with plague standard PCD measurements. Detect changes in lifetimes due to surface conditions or surface preparation steps in standard solar cell manufacturing.

Platform

The flexibility of the sensor design permits easy integration into the production line as either a standalone benchtop unit or integrated within OEM or custom system components. The unit is compact, fast, and contactless and uses a robust LED illuminator for measurements near the surface or through the complete bulk of the substrate. Information is displayed via easy-to-use software that works with 32 or 64 bit ‘Windows’ XP and higher operating systems.

Availability

June 2011 onwards.

22 September 2021
To commemorate the World Energy Storage Day(WESD) on 22 September, being recognized worldwide, Customized Energy Solutions (CES) and India Energy Storage Alliance (IESA) is organising the 5th global conference and virtual expo, which will be held virtually on 22 September 2021. WESD is a global movement initiated by various apex trade bodies working to promote and adopt energy storage, e-mobility & green hydrogen technologies for a sustainable future. The forthcoming edition of WESD is expected to attract global participation with an intent to facilitate bi-lateral trade, market development and new research and innovation, which will invite 100+ countries, 100+ regulators & policy makers, 100+ International speakers,1000+ organisations, 100+ partners & exhibitors and 20,000+ global delegates.
28 September 2021
Solar Solutions International is the largest trade show for solar energy in Northwest Europe. Now the solar market has grown up, it's time for the next step. Solar Solutions International displays more than 500 innovations and over 100 practical seminars concerning the latest in energy storage, smart products, and an ever evolving array of solar panels. As an exclusively B2B trade show, Solar Solutions International offers both exhibitors and visitors the chance to network at the highest level. Duurzaam Verwarmd, the largest trade show for sustainable HVAC technology in the Benelux, is held simultaneously. This way your one visit gets you up to date with all of the developments in both sustainable energy and heating.
6 October 2021
Intersolar Europe is the world’s leading exhibition for the solar industry. It takes place as part of The smarter E Europe – the continent’s largest platform for the energy industry. Under the motto “Connecting solar business,” manufacturers, suppliers, distributors, service providers and project planners and developers from around the world meet in Munich every year to discuss the latest developments and trends, explore innovations firsthand and meet potential new customers.
6 October 2021
The future is bright for a new era of US solar and storage, and the 8th annual Solar & Storage Finance Summit will provide opportunities to discuss solutions to the industry’s challenges and provide a networking platform designed to bring together the top minds in the industry to do business. With a mix of high-level, informative presentations and panels, a stellar cast of speakers and audience members with deal-making capacity, the 2021 edition of the event will be a sell-out success.
18 October 2021
Intersolar South America, South America’s largest exhibition and conference for the solar industry, takes place at the Expo Center Norte in São Paulo, Brazil on October 18–20, 2021, and has a focus on the areas of photovoltaics, PV production and solar thermal technologies. At the accompanying Intersolar South America Conference, renowned experts shed light on hot topics in the solar industry.
19 October 2021
This year’s EV World Congress will hold a special role, not only as the first live EverythingEV event in over a year – a chance to renew your connections and re-engage with the EV sector face to face – but also as a chance to share insight and inspiration as world starts to look towards move on post COVID towards hitting ambitious decarbonisation goals in 2030 and beyond. As ever, we will be bringing world leading organisations, cities, and technology providers to the UK to inspire EV innovators, and delve into the challenges facing the sector as the UK looks to revolutionise road transport.

Read Next

September 17, 2021
BP, Abu Dhabi National Oil Company (ADNOC) and Masdar have partnered up to develop low carbon hydrogen hubs and create decarbonised air travel corridors between the UK and UAE in a deal that will see “billions” of dollars of investment.
September 17, 2021
US utility company Dominion Energy Virginia has proposed 15 new energy projects totalling 1GW of power for the state, which Dominion Energy claimed was the largest group of projects to be submitted to the Virginia State Corporation Commission (SCC)
September 17, 2021
Renewables developer Ørsted has promoted Neil O'Donovan to CEO of its onshore business unit following the resignation of his predecessor in August.
September 17, 2021
A 58.5MW floating PV plant in Thailand, said to be the largest install of its kind in the country, has been connected to the grid, according to inverter and floating solutions supplier Sungrow.
PV Tech Premium
September 17, 2021
PV Tech spoke to investors and analysts about why Brazil is fast becoming an attractive market for solar investment.
September 16, 2021
Vistra Energy has welcomed the enactment of clean energy policies in Illinois which the power generation company said will support 300MW of solar and 150MW of battery storage to be built at nine of its coal plant sites. 

Subscribe to Newsletter

Upcoming Events

Solar Media Events
October 6, 2021
Solar Media Events
October 19, 2021
BRISTOL, UK
Solar Media Events
December 1, 2021