Structure and Charge Carrier Dynamics in Colloidal PbS Quantum Dot Solids

Chen, Wei1; Zhong, Jialin2; Li, Junzi3; Saxena, Nitin1; Kreuzer, Lucas P.1; Liu, Haochen2; Song, Lin1; Su, Bo1; Yang, Dan1; Wang, Kun1; Schlipf, Johannes1; Koerstgens, Volker1; He, Tingchao3; Wang, Kai2; Mueller-Buschbaum, Peter1,4

2019-05-02

10.1021/acs.jpclett.9b00869

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

The ligand exchange process is a key step in fabrications of quantum dot (QD) optoelectronic devices. In this work, on the basis of grazing incidence X-ray scattering techniques, we find that the ligand exchange process with halide ions changes the PbS QD superlattice from face-centered-cubic to body-centered-cubic stacking, while the QD crystal lattice orientation also changes from preferentially "edge-up" to "corner up". Thus, the QDs' shape is supposed to be the main factor for the alignment of QDs in close packed solids. Moreover, we tailor the alignment of the close packed solids by thermal treatments and further investigate their inner charge carrier dynamics by pump probe transient absorption experiments. An overall better structure alignment optimizes the charge carrier hopping rate, as confirmed by the time dependence of the photon bleaching peak shift. The QD solid treated at 100 degrees C shows the best inner structure alignment with the best charge carrier hopping rate.

SCI ; EI

英语

NI期刊

其他

Shenzhen Innovation Project[JCYJ20160301113537474]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000466991300006

AMER CHEMICAL SOC

20191906897109

Alignment ; Charge carriers ; Crystal orientation ; Ionic conduction ; IV-VI semiconductors ; Lead compounds ; Ligands ; Nanocrystals ; Optoelectronic devices ; Sols ; X ray scattering

Mechanical Devices:601.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Products Generally:804 ; High Energy Physics:932.1 ; Crystal Lattice:933.1.1

Web of Science

1.Tech Univ Munich, Dept Phys, Lehrstuhl Funkt Mat, James Franck Str 1, D-85748 Garching, Germany
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Shenzhen Univ, Coll Phys & Energy, Shenzhen 518060, Peoples R China
4.Tech Univ Munich, Heinz Maier Leibnitz Zentrum MLZ, Lichtenbergstr 1, D-85748 Garching, Germany

Chen, Wei,Zhong, Jialin,Li, Junzi,et al. Structure and Charge Carrier Dynamics in Colloidal PbS Quantum Dot Solids[J]. Journal of Physical Chemistry Letters,2019,10(9):2058-2065.

Chen, Wei.,Zhong, Jialin.,Li, Junzi.,Saxena, Nitin.,Kreuzer, Lucas P..,...&Mueller-Buschbaum, Peter.(2019).Structure and Charge Carrier Dynamics in Colloidal PbS Quantum Dot Solids.Journal of Physical Chemistry Letters,10(9),2058-2065.

Chen, Wei,et al."Structure and Charge Carrier Dynamics in Colloidal PbS Quantum Dot Solids".Journal of Physical Chemistry Letters 10.9(2019):2058-2065.