Article (Scientific journals)
Deliberate and Accidental Gas-Phase Alkali Doping of Chalcogenide Semiconductors: Cu(In,Ga)Se2
Colombara, Diego; Berner, Ulrich; Ciccioli, Andrea et al.
2017In Scientific Reports, 7, p. 43266
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Keywords :
Sodium; Potassium; Doping; CIGS; Chalcopyrite; CZTS; Kesterite; Chalcogenide; Solar cell; Photovoltaic; Thin film; GGI gradient; In-Ga interdiffusion; Contamination
Abstract :
[en] Alkali metal doping is essential to achieve highly efficient energy conversion in Cu(In,Ga)Se2 (CIGSe) solar cells. Doping is normally achieved through solid state reactions, but recent observations of gas phase alkali transport in the kesterite sulfide (Cu2ZnSnS4) system (re)open the way to a novel gas-phase doping strategy. However, the current understanding of gas-phase alkali transport is very limited. This work (i) shows that CIGSe device efficiency can be improved from 2% to 8% by gas-phase sodium incorporation alone, (ii) identifies the most likely routes for gas-phase alkali transport based on mass spectrometric studies, (iii) provides thermochemical computations to rationalize the observations and (iv) critically discusses the subject literature with the aim to better understand the chemical basis of the phenomenon. These results suggest that accidental alkali metal doping occurs all the time, that a controlled vapor pressure of alkali metal could be applied during growth to dope the semiconductor, and that it may have to be accounted for during the currently used solid state doping routes. It is concluded that alkali gas-phase transport occurs through a plurality of routes and cannot be attributed to one single source.
Disciplines :
Chemistry
Energy
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Physics
Engineering, computing & technology: Multidisciplinary, general & others
Materials science & engineering
Author, co-author :
Colombara, Diego ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Berner, Ulrich
Ciccioli, Andrea
Malaquias, Joao Corujo Branco ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Bertram, Tobias ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Crossay, Alexandre ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Schöneich, Michael
Meadows, Helen ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Regesch, David ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Delsante, Simona
Gigli, Guido
Valle, Nathalie
Guillot, Jérome
El Adib, Brahime
Grysan, Patrick
Dale, Phillip ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
More authors (6 more) Less
External co-authors :
yes
Language :
English
Title :
Deliberate and Accidental Gas-Phase Alkali Doping of Chalcogenide Semiconductors: Cu(In,Ga)Se2
Publication date :
February 2017
Journal title :
Scientific Reports
ISSN :
2045-2322
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
7
Pages :
43266
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR8302176 - Gas-phase Alkali Doping Of Chalcogenide Semiconductors, 2014 (01/06/2015-31/05/2017) - Diego Colombara
Name of the research project :
GALDOCHS
Funders :
FNR - Fonds National de la Recherche [LU]
Available on ORBilu :
since 13 March 2017

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