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UPC · Universitat Politècnica de Catalunya

Micro and Nanotechnologies

logo UPCThe group brings to the network the expertise in PV solar cell fabrication, technology and measurements.

We have developed state of the art technology for high efficiency silicon solar cell fabrication. In particular and related to the topic of the network (Nanophotonics for Energy efficiency) we fabricate IBC solar cells  (Interdigitated Back Contact) with efficiencies over 22% and 9 cm2  (independently measured). This cell structure, leaving the front surface moderately doped and free of contacts is an ideal benchmark for exploring new nanophotonic approaches  improving the absorption/volume ratio and hence the efficiency.

In this context we have explored the use of colloidal photonic crystals and their compatibility with Silicon solar cell technology. These colloidal photonic crystals can be deposited on large surfaces through a new technology developed by our group and used either directly or as a template for reverse opal formation.  We have also explored silicon microspheres as light traps and other high refraction index nanostructures in particular we have recently obtained the world record efficiency in so-called black Silicon solar cells.

Other cutting edge activities relates to the fabrication of selective thermal emitters for thermophotovoltaic applications and the invention of a procedure called "Silicon Millefeuille" allowing to obtain multiple ultra-thin crystalline Silicon layers from a single Silicon wafer.

Finally, and closer to mainstream industrial application, we work also on HIT solar cells, surface passivation layers research, and laser applications to solar cell technology.

Partner: UPC

Group Leader:  This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Webpage: http://www.eel.upc.edu/

Available Resources

Clean room, PECVD (Plasma Enhanced Chem Vapour Dep), Sputterings, Evaporator and e-beam, Optical lithography, Diffusion and oxidation furnaces. Specific equipment for organic semiconductors processing: (evaporators, glovebox, spinner, ozone cleaner etc) FTIR. Facilities associated to the CRNE: DRX, FIB (Including EDX, EBSD), FTIR, UV-VIS-NIR spectrophotometer. AFM-Nanoscope V, Interferometric microscope, Profilometer. UHV fabrication and characterization platform including : XPS, High pressure and evaporation chamber, AFM -STM(in-situ)

Key Personnel

Ramon Alcubilla is full professor at the Electronic Engineering Department at the Technical University of Catalonia UPC, where he leads together with Professor L. Castañer the Group of Micro and Nanotechnologies formed by more than 20 scientists. At the UPC he coordinates the semiconductor technology facilities and since 2005 directs the Center for Nanoengineering Research( CRnE).He has published more than 60 papers in major journals and has supervised 8 PhD Thesis. His research activity has been focused on photovoltaic technology. Research topics are: Development of new passivation layers for crystalline Silicon solar cells, new technologies for crystalline Silicon solar cell fabrication, HWCVD technology for HIT solar cells fabrication, macroporous Silicon 3D photonic crystals for selective thermal emitters in thermophotovoltaic applications, organic technology and organic devices development in particular solar cells.

Joaquim Puigdollers is an associate professor at the Electronic Engineering Department at the Technical University of Catalonia (UPC). His research activities have been always related to the fabrication and characterization of photovoltaic devices, including the design of photovoltaic systems. Research areas of expertise include: PECDV and HWCVD deposition process, hydrogenated amorphous silicon pin solar cells, Heterojunction with Intrinsic Thin layer (HIT) solar cells, organic solar cells, Thin-film transistors. He has published more that 50 papers in international journals.

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