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Bourdais, S., Chone, C., Delatouche, B., Jacob, A., Larramona, G., Moisan, C., Lafond, A., Donatini, F., Rey, G., Siebentritt, S., Walsh, A. & Dennler, G. (2016) Is the Cu/Zn Disorder the Main Culprit for the Voltage Deficit in Kesterite Solar Cells ? Adv. Energy Mater. 6 1502276.
Added by: Richard Baschera (2017-04-06 12:47:07) Last edited by: Richard Baschera (2017-04-06 12:48:01) |
| Type de référence: Article DOI: 10.1002/aenm.201502276 Numéro d'identification (ISBN etc.): 1614-6832 Clé BibTeX: Bourdais2016 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS Mots-clés: band-gap fluctuations, cu2znsn(s, cu2znsns4, efficiency, nanocrystals, NMR, photovoltaic applications, radiative recombination, se)(4), semiconductors, thin-films Créateurs: Bourdais, Chone, Delatouche, Dennler, Donatini, Jacob, Lafond, Larramona, Moisan, Rey, Siebentritt, Walsh Collection: Adv. Energy Mater. |
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| Résumé |
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Photovoltaic thin film solar cells based on kesterite Cu2ZnSn(S-x, Se1-x)(4) compounds (CZTSSe) have reached {>}12% sunlight-to-electricity conversion efficiency. This is still far from the {>}20% record devices known in Cu(In1-y,Gay)Se-2 and CdTe parent technologies. A selection of {>}9% CZTSSe devices reported in the literature is examined to review the progress achieved over the past few years. These devices suffer from a low open-circuit voltage (V-oc) never better than 60% of the V-oc (max), which is expected from the Shockley-Queisser radiative limit (S-Q limit). The possible role of anionic (S/Se) distribution and of cationic (Cu/Zn) disorder on the V-oc deficit and on the ultimate photovoltaic performance of kesterite devices, are clarified here. While the S/Se anionic distribution is expected to be homogeneous for any ratio x, some grain-to-grain and other non-uniformity over larger area can be found, as quantified on our CZTSSe films. Nevertheless, these anionic distributions can be considered to have a negligible impact on the V-oc deficit. On the Cu/Zn order side, even though significant bandgap changes ({>}10%) can be observed, a similar conclusion is brought from experimental devices and from calculations, still within the radiative S-Q limit. The implications and future ways for improvement are discussed.
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