PVI Paper

HPM silicon: The next generation of multicrystalline silicon for PV

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

By Matthias Trempa, Iven Kupka, Christian Kranert, Christian Reimann & Jochen Friedrich, Fraunhofer IISB, Fraunhofer THM

High-performance multicrystalline (HPM) silicon, achieved by nucleation on special seed layers at the crucible bottom, is now increasingly replacing conventional multicrystalline (mc) silicon, which is solidified on the standard silicon nitride coating. The HPM material is characterized by a very fine initial grain structure consisting of small, regularly shaped grains surrounded by a large number of random-angle grain boundaries. These grain structure properties, which differ significantly from those of conventional multicrystalline silicon, lead to a much lower dislocation content in the material, and therefore result in higher efficiencies of the silicon solar cells produced. This paper gives a rough overview of the worldwide R&D activities on HPM silicon in recent years, supplemented by several research results obtained at Fraunhofer IISB/THM. The focus is on the different seeding methods, the grain structure properties and the development of the grain and defect structure over the ingot height, as well as on the main challenges for further improvements in material quality and production costs.

L3dwLWNvbnRlbnQvdXBsb2Fkcy9sZWdhY3ktcHVibGljYXRpb24tcGRmcy82M2NkMmRkNjZiLWhwbS1zaWxpY29uLXRoZS1uZXh0LWdlbmVyYXRpb24tb2YtbXVsdGljcnlzdGFsbGluZS1zaWxpY29uLWZvci1wdi5wZGY=

Published In

PVI Issue
The thirty-fifth issue of Photovoltaics International brings you insights into how investment in high-efficiency cell technology production appears to be showing no signs of slowing down and more about scientists from the R&D team at Canadian Solar look at so-called ‘black’ silicon, one of the new cell technology concepts beginning to gain currency. Additionally, how researchers from Germany’s Fraunhofer ISE take up the theme with a paper exploring the question of quality control in the production of high-efficiency silicon solar cells and not forgetting the growing importance of thin-film technologies in the overall PV mix.

Read Next

PVI Paper
Cell Processing, Photovoltaics International Papers
The holy grail of every solar cell producer is the creation of a lowcost interdigitated back-contact (IBC) solar cell with an efficiency greater than 25%, a goal that can be found in almost every roadmap presentation. In this paper it will be shown that we are not far away from achieving this target, since IBC devices, with different process complexities, are already in production at several companies.
PVI Paper
Cell Processing, Photovoltaics International Papers
This paper will accordingly outline the recent activities at CEA-INES concerning the development and understanding of the integration of such shingle cells.
PVI Paper
Cell Processing, Photovoltaics International Papers
In this paper, an even greater reduction in wafer thickness, down to 130μm, is evaluated, and the critical steps in terms of breakage rates in cell and module production processes are reviewed. Finally, the mechanical stability and reliability of these thin HJT cells in glass–backsheet and glass–glass module types are addressed.
PVI Paper
Cell Processing, Photovoltaics International Papers
This paper provides a short overview of historical developments, presents the main approaches in mass production today, discusses potential process simplifications, and briefly touches upon a key topic for the future, namely reducing the silver (Ag) consumption per cell.
PVI Paper
Fab & Facilities, Photovoltaics International Papers
This paper discusses what approaches from the digitalization field can be used quickly and easily to accelerate ramp-up, to analyse overlapping data and to improve production either manually or automatically.
PVI Paper
Fab & Facilities, Photovoltaics International Papers
To embrace the terawatt-scale challenge of the PV market growth, a low-carbon and resource-efficient pathway has to be guaranteed. An approach for doing this is to enable market mechanisms that account for the greenhouse gases emissions, and their associated costs, from PV systems and components.

Subscribe to Newsletter

Upcoming Events

Solar Media Events
June 15, 2021
Solar Media Events
July 6, 2021
Solar Media Events
August 24, 2021
Solar Media Events, Upcoming Webinars
October 6, 2021