Challenges and Prospects of Electronic Doping of Colloidal Quantum Dots: Case Study of CdSe

Chikán, Viktor

doi:10.1021/jz2012325

Cited by 62 publications

(61 citation statements)

References 42 publications

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“…Several decades ago Turnbull proposed that very small crystals will tend to contain fewer defects compared with large ones. The concept of self‐purification has been studied for CQDs and has been proposed as a mechanism, which relies on the consideration of thermodynamic factors (energetics), to account for the difficulties met early on in the incorporation of dopants into CQDs for certain systems, such as doping CdSe CQDs with manganese . Later works, however, showed that the dopant‐incorporation efficiency for several dopant:CQD systems, for example Mn:CdSe and In:ZnO, is substantially controlled by kinetics and related factors such as the reactivity of the dopant precursor relative to the reactivity of the host crystal precursors or the dopant′s affinity over the various surface facets of the CQD.…”

Section: Challenges In Doping Cqdsmentioning

confidence: 99%

Strategies for the Controlled Electronic Doping of Colloidal Quantum Dot Solids

Stavrinadis

Konstantatos

2016

ChemPhysChem

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Over the last several years tremendous progress has been made in incorporating colloidal quantum dot (CQD) solids as photoactive components in optoelectronic devices. A large part of this progress is associated with significant advancements made in controlling the electronic doping of CQD solids. Today, a variety of strategies exists towards that purpose; this Minireview aims to survey the major published works in this subject. Additional attention is given to the many challenges associated with the task of doping CQDs, as well as to the realization of optoelectronic functionalities and applications upon successful light and heavy electronic doping of CQD solids.

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Section: Challenges In Doping Cqdsmentioning

confidence: 99%

Strategies for the Controlled Electronic Doping of Colloidal Quantum Dot Solids

Stavrinadis

Konstantatos

2016

ChemPhysChem

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“…electrode and the concentration of dopant, which could result in enhanced electrical and optical properties. [21][22][23] These properties can be enhanced by doping Mn 2+ , Fe 2+ , and Co 2+ to QDs. [24] Of key PbS/TiO 2 photo-anode.…”

mentioning

confidence: 99%

Exploring the effect of manganese in lead sulfide quantum dot sensitized solar cell to enhance the photovoltaic performance

et al. 2015

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Herein we demonstrate for the first time, the combination of PbS with CdSe/CdS/TiO 2 and exploring the impact of manganese (Mn) on PbS (lead sulfide) quantum dot-sensitized solar cells (QDSSCs). Photoanodes were sensitized with different percentages of Mn content (5, 10 and 15%) on PbS/CdS/CdSe using a simple successive ion layer adsorption and reaction (SILAR) technique. The performance of the QDSSCs is examined in detail using polysulfide electrolyte and a copper sulfide (CuS) counter electrode.The optimized percentage of Mn content on PbS/CdS/CdSe electrode results in higher efficiency compared to bare PbS/CdS/CdSe-sensitized QDs. This is confirmed with photovoltaic studies and electrochemical impedance spectroscopy. The 10% Mn-doped PbS/CdS/CdSe electrode exhibits short circuit current density of 17.34 mA cm 2 with an enhanced power to conversion efficiency (ɳ) of 4.25% under 1 sun illumination (AM 1.5 G, 100 mW/cm 2 ). electrode and the concentration of dopant, which could result in enhanced electrical and optical properties. [21][22][23] These properties can be enhanced by doping Mn 2+ , Fe 2+ , and Co 2+ to QDs. [24] Of key PbS/TiO 2 photo-anode. For the deposition of CdSe QDs, the CdS/PbS/TiO 2 -sensitized photo-anode is immersed in an aqueous solution of 0.1 M cadmium acetate dihydrate and 0.2 M Na 2 SeSO 3 for about 8 cycles. Then, the QD-deposited photo-anodes were washed with DI water and dried in N 2 gas. Finally, two cycles of ZnS passivizing layers were coated over the CdSe/CdS/PbS and CdSe/CdS/ Mn-d-PbS sensitized photo-anodes by the SILAR

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“…[1][2][3] Electrically active doping in QDs can also further engender the host QDs with new functional-material properties, thereby improving the electrical/optical properties of colloidal QD (CQD) solids. [4][5][6][7][8][9] Unfortunately, to date, in situ incorporation of dopants during CQD synthesis has been difficult within the nanosize regime. The incorporation of impurity atoms into the interiors of fewnanometer-sized QD host materials is unfavorable owing to several factors: [5,10,11] (i) the dopant solubility limit is often exceeded in the small volume of a QD; (ii) dopants can be ejected from the QD lattice through a thermodynamically controlled self-purification mechanism; and (iii) Coulombic repulsion between charged impurity ions push them towards the QD surface.…”

Section: Introductionmentioning

confidence: 99%

Facile in situ Synthesis of Ag‐Doped CdSe Supra‐Quantum Dots and their Characterization

et al. 2019

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A supra‐quantum dot (SQD) is a three‐dimensionally assembled QD structure composed of several hundreds to thousands of QDs connected through oriented attachments. Owing to their three‐dimensional interconnected structures and relatively large volumes, impurity atoms are thermodynamically more stable in SQDs than in conventional QDs. Herein, we report the facile in‐situ synthesis of colloidal Ag‐doped CdSe SQDs. Ag dopants were efficiently incorporated into CdSe SQDs through the three‐dimensional interconnection of Ag‐doped primary CdSe QDs, as confirmed by elemental analysis combined with chemical etching. Photoelectron spectroscopic studies revealed that the Ag‐doped CdSe SQDs exhibit n‐type doping behavior, since the valence electrons from the interstitial Ag atoms are directly donated to the lattice.

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Challenges and Prospects of Electronic Doping of Colloidal Quantum Dots: Case Study of CdSe

Cited by 62 publications

References 42 publications

Strategies for the Controlled Electronic Doping of Colloidal Quantum Dot Solids

Strategies for the Controlled Electronic Doping of Colloidal Quantum Dot Solids

Exploring the effect of manganese in lead sulfide quantum dot sensitized solar cell to enhance the photovoltaic performance

Facile in situ Synthesis of Ag‐Doped CdSe Supra‐Quantum Dots and their Characterization

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