Synthesis of PbS nanocrystals from sulfur–amine solutions at room temperature

Si, Huayan; Yuan, Du; Chen, Jingsheng; Chow, Gan‐Moog

doi:10.1039/c1ra00279a

Cited by 8 publications

(11 citation statements)

References 50 publications

(73 reference statements)

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“…Because PbCl 2 is used as the lead source, Cl − also is adsorbed on the surface as the inorganic ligand. Previous studies have shown that alkylamine ligands preferentially bind to the {111} facets which are Pb‐rich, [ 33 ] while Cl − binds to the {100} facets forming atomically thin adlayers. [ 34 ] In addition to ligands, steric hindrance also dictates the surface energy.…”

Section: Resultsmentioning

confidence: 99%

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Xia

Chen

Zhang

et al. 2020

Adv Funct Materials

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Trap states in colloidal quantum dot (QD) solids significantly affect the performance of QD solar cells, because they limit the open-circuit voltage and short circuit current. The {100} facets of PbS QDs are important origins of trap states due to their weak or missing passivation. However, previous investigations focused on synthesis, ligand exchange, or passivation approaches and ignored the control of {100} facets for a given dot size. Herein, trap states are suppressed from the source via facet control of PbS QDs. The {100} facets of ≈3 nm PbS QDs are minimized by tuning the balance between the growth kinetics and thermodynamics in the synthesis. The PbS QDs synthesized at a relatively low temperature with a high oversaturation follow a kinetics-dominated growth, producing nearly octahedral nanoparticles terminated mostly by {111} facets. In contrast, the PbS QDs synthesized at a relatively high temperature follow a thermodynamics-dominated growth. Thus, a spherical shape is preferred, producing truncated octahedral nanoparticles with more {100} facets. Compared to PbS QDs from thermodynamics-dominated growth, the PbS QDs with less {100} facets show fewer trap states in the QD solids, leading to a better photovoltaic device performance with a power conversion efficiency of 11.5%.

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Section: Resultsmentioning

confidence: 99%

Facet Control for Trap‐State Suppression in Colloidal Quantum Dot Solids

Xia

Chen

Zhang

et al. 2020

Adv Funct Materials

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“…In contrast, the lead-based chalcogenides semiconductor materials (PbS, PbSe and PbTe) have been extensively studied in the last few decades owing to their unique intrinsic properties. [213][214][215] As the direct gap semiconductors in the bulk phase, they have a cubic (rock-salt) crystal structure and narrow band gaps (0.28-0.46 eV). Their high dielectric constants (e 3 = 18.0-24.0) as well as the small electron and hole effective masses (,0.1m*; m*: free electron mass) create excitons with a relatively large effective Bohr radii (20-46 nm).…”

Section: Preparation and Mechanism Of Lead-based Semiconductor Ncsmentioning

confidence: 99%

Recent advances in IV–VI semiconductor nanocrystals: synthesis, mechanism, and applications

et al. 2013

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This review is focused on the recent developments of the synthesis, mechanism and applications of IV-VI semiconductor nanocrystals (NCs), including germanium-, tin-and lead-based chalcogenides NCs. First of all, we systematically introduce a series of investigations on the preparation with controllable size and shape via a wide variety of methods. Corresponding growth mechanisms are also discussed. Moreover, the promising potential of IV-VI semiconductor NCs as building blocks with respect to energy, sensors and catalysis is highlighted. For the purpose of enhancing the performance to satisfy the practical applications, tailored nanocomposites by combining noble metals or graphene etc. are further developed. Finally, we present some concluding remarks and perspectives for future developments. We hope this article can provide researchers with the key snapshots of the recent advances and the future challenges, thus achieving a great progress in IV-VI semiconductor NCs.

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“…The polysulfide ions react with excess amine, produced in situ, and the generated H 2 S can quickly react with metal salts to form metal sulfide NCs. Most recently, Si et al used a sulfur-alkylamine solution as a sulfur precursor to prepare PbS NCs at room temperature depending on the produced H 2 S. 17 Therefore, a similar reaction mechanism could be used to explain the synthesis of PbS below room temperature. The possible reaction pathway could be described follows: 47…”

Section: The Mechanism Of the Synthesis Of The Pbs Ncs Below Room Tem...mentioning

confidence: 99%

“…Recently, a few groups have found that some semiconductor NCs (e.g. PbS) [15][16][17] could be synthesized at room temperature using an organic solvent, which is the lowest reaction temperature as far as we know to date. Is it possible to synthesize semiconductor NCs at lower temperatures than room temperature, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In the synthesis of NCs, such as Au (wires, rods and particles), 38,39 CdSe, InP, 13 MnSe 40 and PbS NCs, 17,41 alkylamine acts as a reducing agent and decreases the reaction temperature for the synthesis of the NCs. Although there are a great number of reports about using a sulfur-amine solution to synthesize NCs, the reaction temperatures are normally above room temperature.…”

Section: Introductionmentioning

confidence: 99%

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