Roman Keding | Fraunhofer ISE: Is the solar industry's growth about to be choked by a silver shortage?
00:05:03 - 00:05:47
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Summary of the clip:
Is the solar industry's growth about to be choked by a silver shortage?
The exponential growth required to meet global climate goals is putting immense pressure on the solar industry's supply chain, particularly concerning silver. In 2020, photovoltaics already consumed 10% of the global silver supply. Projecting the production capacity needed to achieve climate targets—a nearly tenfold increase to 3 Terawatts—reveals a critical bottleneck: the industry would consume the entire world's silver supply before 2030.
This resource constraint makes reducing silver consumption a non-negotiable requirement for the future of solar energy. The industry has set aggressive targets to drive down silver usage to sustainable levels, aiming for 5 milligrams per watt, and ultimately as low as 2 milligrams per watt. Achieving this goal is paramount for ensuring the long-term viability and cost-effectiveness of photovoltaic technology.
Two primary technological pathways are being pursued to tackle this challenge. The first is an evolutionary approach focused on fine-line printing, which aims to create narrower and taller conductive fingers to use less silver paste for the same electrical performance. The second, more revolutionary approach, involves replacing silver altogether with more abundant and less expensive materials, with copper being the leading candidate.
In this short video, you can learn:
* The critical dependency of the PV industry on the global silver supply.
* The quantitative target for silver reduction needed for sustainable growth.
* The two main technological pathways to solve this: fine-line printing and silver replacement.
📋 **Clip Abstract** The exponential growth of solar energy faces a critical bottleneck: silver consumption. This clip quantifies the impending resource crisis and outlines the key technological strategies, like fine-line printing and copper substitution, required to sustain the industry's expansion.
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#SilverReduction, #FineLinePrinting, #SilverReplacement, #Photovoltaics, #PrintedElectronics, #AdditiveElectronics
This is a highlight of the presentation:
Thinner than a human hair - fine line metallization for next-generation silicon solar cells
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00:07:03 - 00:08:35
Can screen printing, a centuries-old technology, produce lines thinner than a human hair for next-gen solar cells?
Can screen printing, a centuries-old technology, produce lines thinner than a human hair for next-gen solar cells?
The journey of continuous improvement in screen printing for solar metallization is highlighted, showing a dramatic reduction in finger feature size from over 100 microns in 2008 down to the sub-20 micron range required today. This evolution has been critical for improving solar cell efficiency by minimizing shading losses while simultaneously reducing the consumption of expensive silver paste.
This remarkable progress was not achieved by a single breakthrough, but through a systematic, multi-faceted optimization approach. Key areas of innovation include developing advanced silver pastes with tailored rheology for clean printing, engineering sophisticated screen meshes with higher mesh counts and finer wire diameters, and even employing laser-based methods to create ultra-precise screen openings beyond the limits of traditional emulsion techniques.
The culmination of this research is a new record for screen-printed fingers, achieving a width of just 14 microns with a height of 15 microns. This dimension is comparable to a human hair, demonstrating the incredible precision now possible with an industrial, high-throughput printing process. This achievement sets a new benchmark for high-efficiency, low-cost solar cell manufacturing using the industry's incumbent technology.
In this short video, you can learn:
* The decade-long evolution of screen-printed feature sizes in photovoltaics.
* The key optimization levers: advanced pastes, engineered screens, and laser processing.
* A new world record for screen printing: a 14-micron wide conductive finger.
📋 **Clip Abstract** This clip details the remarkable evolution of screen printing for solar cell metallization, culminating in a record-breaking 14-micron finger, thinner than a human hair. It explores the combination of paste, screen, and process innovations that have pushed this industrial technology to its physical limits.
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#ScreenPrinting, #SolarMetallization, #FineLinePrinting, #SilverPaste, #PrintedElectronics, #AdditiveElectronics
00:09:38 - 00:10:51
What if you could replace expensive silver and complex photolithography in high-efficiency solar cells with a simple inkjet printing and copper plating process?
What if you could replace expensive silver and complex photolithography in high-efficiency solar cells with a simple inkjet printing and copper plating process?
A novel, additive manufacturing process is presented for creating copper electrodes on low-temperature silicon heterojunction solar cells. The process begins by using high-precision inkjet printing to deposit a temporary mask made from a waxy, phase-change ink directly onto the cell's conductive Transparent Conductive Oxide (TCO) layer. This digital, maskless approach allows for rapid design changes and precise pattern definition.
Following the mask deposition, the entire wafer undergoes an electrochemical copper plating process. The copper selectively deposits only on the unmasked areas of the conductive TCO, growing into the desired grid pattern. The final step involves a simple stripping process to remove the waxy ink mask, leaving behind a high-resolution, pure copper electrode structure that is free from the porosity issues often seen in sintered paste-based electrodes.
This technique achieves an impressive feature size of just 10.5 microns, resulting in a solid, homogeneous copper finger with excellent electrical performance. The power of this approach was demonstrated by using it to replace a costly and complex photolithography step in the fabrication of a III-V on silicon solar cell, contributing to a world-class efficiency of 31.6% and proving its viability for next-generation PV devices.
In this short video, you can learn:
* A step-by-step guide to the mask-and-plate process using inkjet and copper plating.
* How this additive approach achieves sub-11 micron features with superior electrical properties.
* The successful replacement of photolithography in a record 31.6% efficiency solar cell.
📋 **Clip Abstract** Discover a groundbreaking method that uses inkjet printing of a wax mask followed by copper plating to create ultra-fine electrodes for solar cells. This process not only eliminates the need for expensive silver but also replaces complex photolithography, as demonstrated on a record-efficiency 31.6% solar cell.
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#InkjetPrinting, #CopperPlating, #WaxyMask, #AdditiveManufacturing, #PrintedElectronics, #Photovoltaics