Silicon Materials Workshop

4th Silicon Materials Workshop and

11th International Workshop on Crystalline Silicon for Solar Cells

New date: September 1st – 3rd, 2021 in Lisbon, Portugal

Dear Colleagues,

with great pleasure we announce the new date for the SiMat and CSSC workshop. You will receive shortly the information to partecipate at the event.

Joao Serra and Gianluca Coletti



This year and for the second time, we offer the participants of the SiMat and CSSC workshops a joint and unique event hosted by the University of Lisbon in Portugal, from September the 1st to the 3rd, 2021 (NEW DATE). The CSSC workshop is focused on the silicon material and the substrate with strong attention on crystallization. The SiMat workshop focuses on the interface between silicon materials and cell and module technologies. Combining the two workshops will create a fantastic opportunity to exchange knowledge and insights between industrial and scientific participants from the two communities. The program will include invited and contributed oral and poster presentations in addition to several open forum discussions on selected topics.
Welcome to a unique silicon for photovoltaics event in Lisbon!

Topics to be covered at the workshop are:

• Fundamental materials science related to crystalline silicon solar cells
• Silicon feedstock technologies
• Crystallization of multicrystalline, quasi-mono, monocrystalline silicon
• Advanced wire sawing and emerging kerfless technologies
• Novel materials and processing for advanced cell architecture 
• Impact of silicon material to performance of cell, module and PV system
• Degradation phenomena related to silicon materials on cell and module performance (e.g. LID, LeTID, PID, hotspot, etc.)

In the past, CSSC was held in Sendai, Japan (2006), Xiamen, China (2007), Trondheim, Norway (2009), Taipei, Taiwan (2010), Boston, USA (2011), Aix-les-Bains, France (2012), Fukuoka, Japan (2013), Bamberg, Germany (2015),  Tempe, USA (2016) and Sendai (2018).

The SiMat was held in Amsterdam, the Netherlands (2008), Rome, Italy (2013), Tempe, USA (2016).

Important dates

Call for Abstracts: January 2021

Abstract submission deadline: April 26th, 2021

Notification of Acceptance: June 12th, 2021

Notification of selection for SOLMAT: June 12th, 2021

Start of Registration: to be announced

Early Bird Registration until: to be announced

Conference date: September 1-3, 2020 (NEW DATE)

Abstract preparation and submission

Deadline for abstract submission: April 26th, 2021

Abstract (in the format of 1 page + up to 2 explanatory pages) shall be written in English and must include the following sections: Aim, scientific innovation and results, conclusions. Author needs to provide Title of the contribution, full name, affiliation and email address of all the authors and co-authors and one author for all the correspondence.

Submit your abstract to:

Peer review publications.

During the abstract review top contributions will be selected for publication in Solar Energy Materials & Solar Cells. Authors of these selected abstracts will be encouraged to submit their full paper. Instructions will be provided on how to make use of this option.

Notification of the review process will be sent to the corresponding author on June the 12th, 2021.




The joint SiMaterials and CSSC workshops are hosted by the Faculty of Sciences of the University of Lisbon. the joint workshop will be held at the:

Faculty of Sciences of the University of Lisbon (FCUL)

Campo Grande 016, 1749-016 Lisboa, Portugal


Local organiser joint event SiMat and CSSC

  • João Serra, FCUL, Portugal – Chair
  • Gianluca Coletti, TNO Energy Transition, the Nederlands and UNSW, Australia  – Co-Chair
  • José Silva, FCUL, Portugal
  • Killian Lobato, FCUL, Portugal
  • Guilherme Gaspar, FCUL, Portugal
  • Ivo Costa, FCUL, Portugal
  • Daniel Vilhena, FCUL, Portugal

Scientific committee

  • Gianluca Coletti (TNO and UNSW) – Chair
  • Ivan Gordon (imec)
  • Anis Jouini (INES)
  • Eivind Johannes Ovrelid (Sintef)
  • Martin Schubert (Fraunhofer ISE)
  • Mariana Bertoni (ASU)
  • João Serra (FCUL)


Reasons for the Si-Materials workshop

The Si-Materials workshop series target specific issues in the field of crystalline silicon materials for photovoltaic applications. The workshop presentations and discussion sessions rotate around this topic.
The workshop’s main character is to be at the interface between silicon material technologies and cell- and module technologies.


The first workshop was organized in Amsterdam, the Netherlands, in 2008. The focus was on solar-grade feedstock specifications. At that time the poly-silicon shortage necessitated the redefinition of solar grade silicon and its specifications. The workshop resulted in a tentative and approximate standard set of specifications for solar grade silicon suitable for the fabrication of solar cells which were taken as basis for the discussion and the formulation of the SEMI standard on polysilicon issued in 2009.

 The second workshop was organized in Rome, Italy in 2013 and focused on the challenges for Si materials. The main debates were around mono- and multi-crystalline silicon from the different perspective of wafer, cell and module producers and customers in a market dominated by oversupply of PV modules. The outcome was reported in the editorial of a special edition of Solar Energy Materials and Solar Cells, Volume 130, November 2014, from page 629.

The third workshop was organised in Tempe, Arizona, USA. in 2016. The market situation has changed again. The PV industry was coming out from dark economical and financial situations. It was the time where new technologies were to be implemented to keep and further increase this positive trend. The focus was to discussion and debate over new technologies available and in R&D phase for the PV industry. In this market situation, an often mentioned topic was and still is the ongoing debate between p- and n-type silicon together with silicon defect mitigation processes. These topics was the core of the Si-Materials workshop 3rd edition.