Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

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Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO. / Bamini, Sesha ; Němec, Hynek; Zidek, Karel; Abdellah, Mohamed; Al-Marri, Mohammed J.; Chábera, Pavel; Ponseca, Carlito; Zheng, Kaibo; Pullerits, Tönu.

In: Physical Chemistry Chemical Physics, Vol. 19, No. 8, 2017, p. 6006-6012.

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Bamini, Sesha ; Němec, Hynek ; Zidek, Karel ; Abdellah, Mohamed ; Al-Marri, Mohammed J. ; Chábera, Pavel ; Ponseca, Carlito ; Zheng, Kaibo ; Pullerits, Tönu. / Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO. In: Physical Chemistry Chemical Physics. 2017 ; Vol. 19, No. 8. pp. 6006-6012.

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TY - JOUR

T1 - Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

AU - Bamini, Sesha

AU - Němec, Hynek

AU - Zidek, Karel

AU - Abdellah, Mohamed

AU - Al-Marri, Mohammed J.

AU - Chábera, Pavel

AU - Ponseca, Carlito

AU - Zheng, Kaibo

AU - Pullerits, Tönu

PY - 2017

Y1 - 2017

N2 - Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra shows that electron injection occurs in a two-step process, where the formation of a charge transfer state (occurring in several picoseconds) is followed by its dissociation within tens of picoseconds. The photoconductivity of electrons injected into the ZnO nanoparticles is lower than that of charges photogenerated directly in ZnO. We conclude that the motion of injected electrons in ZnO nanoparticles is strongly influenced by their interaction with positive charges left in the sensitizing quantum dots.

AB - Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra shows that electron injection occurs in a two-step process, where the formation of a charge transfer state (occurring in several picoseconds) is followed by its dissociation within tens of picoseconds. The photoconductivity of electrons injected into the ZnO nanoparticles is lower than that of charges photogenerated directly in ZnO. We conclude that the motion of injected electrons in ZnO nanoparticles is strongly influenced by their interaction with positive charges left in the sensitizing quantum dots.

UR - http://www.scopus.com/inward/record.url?scp=85015070944&partnerID=8YFLogxK

U2 - 10.1039/c6cp07509f

DO - 10.1039/c6cp07509f

M3 - Article

C2 - 28182179

AN - SCOPUS:85015070944

VL - 19

SP - 6006

EP - 6012

JO - Physical chemistry chemical physics : PCCP

JF - Physical chemistry chemical physics : PCCP

SN - 1463-9084

IS - 8

ER -