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Towards the next generation of highefficiency Cu(In,Ga)Se2 thin-film solar cells – Sharc25

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By Wolfram Witte; Philip Jackson; Stephan Buecheler; Romain Carron; Susanne Siebentritt; Florian Werner; Sébastien Duguay; Arantxa Vilalta-Clemente; Roberto Menozzi; Giovanna Sozzi; Emilie Bourgeois; Giedrius Degutis; Marcus Bär; Thomas Kunze; Sascha Sadewasser; Nicoleta Nicoara; Martti J. Puska; Maria Malitckaya; Ayodhya Nath Tiwari

The EU Horizon Sharc25 project has provided deep insights into highly efficient Cu(In,Ga)Se2 (CIGSe) thin-film solar cells fabricated by lowand high-temperature co-evaporation using advanced characterization methods, analytical tools, device simulation, and density functional theory modelling. This complementary approach led to a continuous knowledgedriven development and improvement of the CIGSe absorber. Based on optimized chemical composition, profiles, and alkali metal post-deposition treatments (PDT) using KF, RbF, and CsF, the CIGSe cell efficiency could be substantially increased to a record value of 22.6%. Due to additional modifications at the absorber/emitter (replacement of standard buffer system by a combination of thin CdS and TiO2) and back contact/ absorber (introduction of Al back reflector in combination with InZnO diffusion barrier) interfaces, in particular the short-circuit current could be increased. Furthermore, passivation layers in combination with point contact schemes at the CIGSe front and back side were developed and are still under investigation.

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Welcome to Photovoltaics International 41. An emerging theme in the industry further downstream is the growing variety of bankable PV modules. It’s a topic we’ll be picking up on 23-24 October at our PV ModuleTech conference in Penang, Malaysia. This issue of PVI captures the ongoing work to drive improvements across the full range of those technologies. From the exploration of next generation CIGs cells to the commercial improvements of PERC by Trina Solar, this edition neatly captures that variety. Fraunhofer ISE reviews the latest results from efforts to improve the texturing of diamond wire sawn wafers. Trina Solar presents a roadmap for PERC improvements that it claims could halve costs while pushing efficiencies to 24% in around seven years. ECN and imec explore the latest developments in integrated cell to module manufacturing approaches from the more familiar multi-busbar and multi-wire to shingling and woven fabric and foil-based module technologies for back contacted cells. Elsewhere, CSEM INES zooms in on a major limiting factor for silicon heterojunction cells, metallization. All the regular features including our news reviews and R&D spending report make a return, plus lots more. Following on from this bumper edition, PVI42 will be published in Spring 2019.

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