Equilibrium self-assembly of close-packed ordered PbTe nanocrystal thin film and near-infrared photoconductive detector

Lin, Zhonghai; Wang, Minqiang; Zhang, Liyuan; Xue, Yaohui; Yao, Xi; Cheng, Haowei; Bai, Jintao

doi:10.1039/c2jm00054g

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…Ko et al 176 cited the Urban 172 route when preparing PbTe NCs of various sizes to measure Fermi level energies and densities of states in PbTe films. Likewise Lin et al 177 grew their PbTe materials for photoconductivity studies following Urban 172 and Murphy. 171 Fafarman et al 178 also used the Urban 172 method to produce oleyl capped PbTe NCs but added methods to replace the long alkyl chain ligands, both in solution or in deposited NC films, with far more compact ammonium thiocyanate ligands, thereby improving charge mobility and injection/extraction efficiencies.…”

Section: Pb Chalcogenidesmentioning

confidence: 99%

“…Fabrication of PbTe NC close packed films has been reported by several groups. 170,172,173,177 Lu et al 170 formed regularly packed spherical PbTe NC arrays and mosaic-like arrays of cubic PbTe NCs. Urban et al 172 synthesized a range of different sized monodisperse PbTe NCs, with a range of shapes from spherical to cubic via octahedral, and demonstrated films with long-range ordering and some with glassy, disordered packing.…”

Section: Nc Close Packed Arrays Dense Films and Solidsmentioning

confidence: 99%

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Narrow bandgap colloidal metal chalcogenide quantum dots: synthetic methods, heterostructures, assemblies, electronic and infrared optical properties

2013

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The chemistry, material processing and fundamental understanding of colloidal semiconductor nanocrystals (quantum dots) are advancing at an astounding rate, bringing the prospects of widespread commercialization of these novel and exciting materials ever closer. Interest in narrow bandgap nanocrystals in particular has intensified in recent years, and the results of research worldwide point to the realistic prospects of applications for these materials in solar cells, infrared optoelectronics (e.g. lasers, optical modulators, photodetectors and photoimaging devices), low cost/large format microelectronics, and in biological imaging and biosensor systems to name only some technologies. Improvements in fundamental understanding and material quality are built on a vast body of experience spread over many different methods of colloidal synthetic growth, each with their own strengths and weaknesses for different materials and sometimes with regard to particular applications. The nanocrystal growth expertise is matched by a rapidly expanding, and highly interdisciplinary, understanding of how best to assemble these materials into films or hybrid composites and thereby into useful devices, and again there are many different strategies that can be adopted. In this review we have attempted to survey and compare the recent work on colloidal synthesis, film and nanocrystal composite material fabrication, concentrating on narrow bandgap chalcogenide materials and some of their topical applications in the solar energy and biological fields. Since these applications are attracting rising interest across a wide range of disciplines, from the biological sciences, device engineering, and materials processing fields as well as the physics and synthetic chemistry communities, we have endeavoured to make the review of these narrow bandgap nanomaterials both comprehensive and accessible to newcomers to the area.

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Section: Pb Chalcogenidesmentioning

confidence: 99%

Section: Nc Close Packed Arrays Dense Films and Solidsmentioning

confidence: 99%

Narrow bandgap colloidal metal chalcogenide quantum dots: synthetic methods, heterostructures, assemblies, electronic and infrared optical properties

2013

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“…The formation of SLs is strongly affected by the solvent evaporation process (Figure 2), which depends on several factors, such as fluctuations in solvent density and nanoparticle diffusion. 31,40…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, assembling hierarchically organized NC solids that display highly periodic patterns over areas spanning square centimeters presents an immense potential for the fabrication of NC-based transistors with enhanced electrical mobility. 40…”

Section: Resultsmentioning

confidence: 99%

Long-Range Order in Nanocrystal Assemblies Determines Charge Transport of Films

et al. 2017

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Self-assembly of semiconductor nanocrystals (NCs) into two-dimensional patterns or three-dimensional (2-3D) superstructures has emerged as a promising low-cost route to generate thin-film transistors and solar cells with superior charge transport because of enhanced electronic coupling between the NCs. Here, we show that lead sulfide (PbS) NCs solids featuring either short-range (disordered glassy solids, GSs) or long-range (superlattices, SLs) packing order are obtained solely by controlling deposition conditions of colloidal solution of NCs. In this study, we demonstrate the use of the evaporation-driven self-assembly method results in PbS NC SL structures that are observed over an area of 1 mm Ã\u97 100 Î¼m, with long-range translational order of up to 100 nm. A number of ordered domains appear to have nucleated simultaneously and grown together over the whole area, imparting a polycrystalline texture to the 3D SL films. By contrast, a conventional, optimized spin-coating deposition method results in PbS NC glassy films with no translational symmetry and much shorter-range packing order in agreement with state-of-the-art reports. Further, we investigate the electronic properties of both SL and GS films, using a field-effect transistor configuration as a test platform. The long-range ordering of the PbS NCs into SLs leads to semiconducting NC-based solids, the mobility (Î¼) of which is 3 orders of magnitude higher than that of the disordered GSs. Moreover, although spin-cast GSs of PbS NCs have weak ambipolar behavior with limited gate tunability, SLs of PbS NCs show a clear p-type behavior with significantly higher conductivities

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“…Recently, a maximum external quantum efficiency of 122% has been reported in PbSe NR solar cells, indicating a strong MEG effect [9]. Among lead chalcogenide systems, PbTe has a large excitonic Bohr radius (∼ 46 nm) and light e − and h + masses as well as a large dielectric constant (ε 0 ∼ 1000), which make it widely used in photodetectors [17], solar cells [18], optical switches [19] and thermoelectrical devices [20]. In addition, the large anisotropy inherent to the bandstructure of PbTe (a B ∼12 nm, a B⊥ ∼150 nm) renders PbTe NCs a uniquely interesting subject for optoelectronic investigations and shape engineering of quantum properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ultra-narrow PbTe nanorods with extremely strong quantum confinement

Han

Fang

et al. 2019

Journal of Materials Science & Technology

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Monodisperse, high-quality, ultra-narrow PbTe nanorods were synthesized for the first time in a one-pot, hot-injection reaction using trans-2-decenoic acid as the agents for lead precursors and tris(diethylamino)phosphine telluride together with free tris(diethylamino)phosphine as the telluride precursors. High monomer reactivity, rapid nucleation and fast growth rate derived from the new precursors led to the anisotropic growth of PbTe nanocrystals at low reaction temperatures (<150 • C). In addition, the aspect ratio of PbTe nanorods could be largely adjusted from 4 to 15 by tuning the Pb to Te precursor molar ratio and reaction temperatures. Moreover, the synthesized ultra-narrow PbTe nanorods exhibited extremely strong quantum confinement and presented unique optical properties. We revealed that the diameter and length of PbTe nanorods could significantly affect their optical properties, which potentially offer them new opportunities in the application of optoelectronic and thermoelectric devices and make them desired subjects for multiple exciton generation and other fundamental physics studies.

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Equilibrium self-assembly of close-packed ordered PbTe nanocrystal thin film and near-infrared photoconductive detector

Cited by 20 publications

References 17 publications

Narrow bandgap colloidal metal chalcogenide quantum dots: synthetic methods, heterostructures, assemblies, electronic and infrared optical properties

Narrow bandgap colloidal metal chalcogenide quantum dots: synthetic methods, heterostructures, assemblies, electronic and infrared optical properties

Long-Range Order in Nanocrystal Assemblies Determines Charge Transport of Films

Synthesis of ultra-narrow PbTe nanorods with extremely strong quantum confinement

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