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Cellules solaires sensibilisées par points quantiques très efficaces à Zn-Cu-en-Se par recouvrement à la surface avec de l'acide ascorbique.

L'équilibre entre la structure, la composition et le défaut de la bande est essentiel pour améliorer les propriétés optoélectroniques des points quantiques ternaires et quaternaires et les performances photovoltaïques correspondantes. Dans ce travail, de l'acide ascorbique (AA) en tant que ligand coiffant est introduit dans le système réactionnel pour préparer des points quantiques verts Zn-Cu-In-Se (ZCISe). Les résultats montrent que l'ajout de AA peut augmenter le contenu en Zn tout en le diminuant, entraînant un élargissement de la bande interdite, un niveau d'énergie élevé de la bande de conduction et une recombinaison de charge supprimée. Lorsque le rapport AA / Cu est égal à 1, les points quantiques possèdent la bande interdite la plus large de 1,49 eV et les cellules solaires sensibilisées au point quantique assemblées présentent des performances photovoltaïques supérieures, avec une augmentation d’environ 17%, principalement dues à la densité de courant considérablement accrue. Les nouveaux rendements record de 10,44 et 13,85% sont obtenus à partir des cellules ZCISe assemblées avec des contre-électrodes à mailles de laiton et de titane, respectivement.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30675780


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