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المؤلفAbdellah, Mohamed
المؤلفPoulsen, Felipe
المؤلفZhu, Qiushi
المؤلفZhu, Nan
المؤلفŽídek, Karel
المؤلفChábera, Pavel
المؤلفCorti, Annamaria
المؤلفHansen, Thorsten
المؤلفChi, Qijin
المؤلفCanton, Sophie E.
المؤلفZheng, Kaibo
المؤلفPullerits, Tõnu
تاريخ الإتاحة2020-11-19T08:53:09Z
تاريخ النشر2017
اسم المنشورNanoscale
المصدرScopus
الرقم المعياري الدولي للكتاب20403364
معرّف المصادر الموحدhttp://dx.doi.org/10.1039/c7nr04495j
معرّف المصادر الموحدhttp://hdl.handle.net/10576/17007
الملخصUltrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1−xS1−y gradient core–shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell thicknesses was studied. Complementary photoelectrochemical cell measurements were carried out to confirm that the hole injection from the active core through the gradient shell to NiO takes place. The hole injection from the valence band of the QDs to NiO depends much less on the shell thickness when compared to the corresponding electron injection to n-type semiconductor (ZnO). We simulate the charge carrier tunneling through the potential barrier due to the gradient shell by numerically solving the Schrödinger equation. The details of the band alignment determining the potential barrier are obtained from X-ray spectroscopy measurements. The observed drastic differences between the hole and electron injection are consistent with a model where the hole effective mass decreases, while the gradient shell thickness increases.
راعي المشروعThis work was made possible by NPRP Grant # NPRP7-227-1-034 from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are solely the responsibility of the authors. Financial support from KWA, Swedish Research Council, and STINT (CH2015-6232) is acknowledged. The ELI-ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund. Q.C. acknowledges the financial support by the Danish Council for Independent Research for Natural Science (DFF-FNU). We are dedicating this work to the soul of Prof. Ahmed Zewail.
اللغةen
الناشرRoyal Society of Chemistry
الموضوعCadmium Sulfide
Solar Cells
Quantum Dots
العنوانDrastic difference between hole and electron injection through the gradient shell of Cd: XSeyZn1- xS1- y quantum dots
النوعArticle
الصفحات12503-12508
رقم العدد34
رقم المجلد9
dc.accessType Open Access


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