Engineering the surface chemistry of lead chalcogenide nanocrystal solids to enhance carrier mobility and lifetime in optoelectronic devices

Oh, Soong Ju; Straus, Daniel B.; Zhao, Tianshuo; Choi, Jung Chan; Lee, S.-W.; Gaulding, E. Ashley; Murray, Christopher B.; Kagan, Cherie R.

doi:10.1039/c6cc07916d

Cited by 36 publications

(47 citation statements)

References 30 publications

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“…After EDT treatment, peak intensities were significantly decreased, indicating successful ligand exchange with EDT due to smaller number of CH‐ bonds compared to oleic acid or oleylamine . Free S–H peaks around 2500–2600 cm −1 were not observed after EDT treatment, indicating that Au–S or Cd–S bonding is formed …”

Section: Resultsmentioning

confidence: 99%

Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors

Lee

Joh

et al. 2017

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All-solution processed, high-performance wearable strain sensors are demonstrated using heterostructure nanocrystal (NC) solids. By incorporating insulating artificial atoms of CdSe quantum dot NCs into metallic artificial atoms of Au NC thin film matrix, metal-insulator heterostructures are designed. This hybrid structure results in a shift close to the percolation threshold, modifying the charge transport mechanism and enhancing sensitivity in accordance with the site percolation theory. The number of electrical pathways is also manipulated by creating nanocracks to further increase its sensitivity, inspired from the bond percolation theory. The combination of the two strategies achieves gauge factor up to 5045, the highest sensitivity recorded among NC-based strain gauges. These strain sensors show high reliability, durability, frequency stability, and negligible hysteresis. The fundamental charge transport behavior of these NC solids is investigated and the combined site and bond percolation theory is developed to illuminate the origin of their enhanced sensitivity. Finally, all NC-based and solution-processed strain gauge sensor arrays are fabricated, which effectively measure the motion of each finger joint, the pulse of heart rate, and the movement of vocal cords of human. This work provides a pathway for designing low-cost and high-performance electronic skin or wearable devices.

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Section: Resultsmentioning

confidence: 99%

Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors

Lee

Joh

et al. 2017

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“…We anticipate that the PbSe nanocrystal films with SnSe-like interstitial material in this work could be promising for thin film transistors, [42,43] and optoelectronics. [44][45][46][47] PbSe is also an excellent thermoelectric material [48,49] and Sn-alloyed PbSe can function as topological crystalline insulator. [50][51][52]…”

Section: Treatment Of Pbse Nanocrystal Thin Films With Tin(iv) Methylmentioning

confidence: 99%

Tin(IV) Methylselenolate as a Low Temperature SnSe Precursor and Conductive “Glue” Between Colloidal Nanocrystals

Vartak

Wang

2020

ChemNanoMat

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We report the synthesis of a soluble precursor that transforms into crystalline SnSe at 200 °C. This transformation temperature is significantly lower than the 270–350 °C range of previously reported tin selenide precursors. This precursor is synthesized by reacting tin with dimethyl diselenide and we identify the precursor as tin(IV) methylselenolate using a combination of mass spectrometry, Raman spectroscopy, and nuclear magnetic resonance spectroscopy. We then chemically treat PbSe colloidal nanocrystals with this precursor and subject them to mild annealing. We characterize the chemical and structural changes during this processing using infrared spectroscopy, aberration‐corrected scanning transmission electron microscopy, and X‐ray photoelectron spectroscopy. These characterization studies indicate the successful formation of a SnSe‐like material that fills the interstitial space between the PbSe nanocrystal cores. We find that the electrical conductivity of these nanocrystal films is comparable to other excellent treatments used to improve charge transport. This excellent charge transport demonstrates the utility of tin(IV) methylselenolate as a conductive “glue” between nanocrystals.

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“…Lead chalcogenides nanocrystals [1][2][3], with a large exciton Bohr radius [4], are of high interest for optoelectronic applications, such as light-emitting diodes [5], photodetectors [6], and photovoltaic devices [7,8]. This interest arises mostly from the strong quantum confinement, and the broad size-tunability of the bandgap energies [9,10].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the size-dependent photoluminescence emission of CBD-grown PbSe nanocrystals on glass

Hemati

Weng

2020

Nano Ex.

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In this work, we study the size-dependent properties of Photoluminescence (PL) emissions of PbSe Nanocrystals (NCs) grown by Chemical Bath Deposition (CBD) method. In previous studies, PL emissions have been tuned by CBD-grown PbSe, and the growth mechanism was dependent on crystalized substrates such as GaAs. In this research, however, PL emissions are controlled over the midinfrared (MIR) range, through PbSe NCs, which are deposited on glass as an amorphous material. This study proposes an alternative approach to control PL emissions, which provides us with more freedom to fabricate low-cost MIR light sources as crucial components in remote sensing and gas analysis. Moreover, in this study, the advantage of the post-thermal method to control the NCs size, compared to the growth temperature, is shown.

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Engineering the surface chemistry of lead chalcogenide nanocrystal solids to enhance carrier mobility and lifetime in optoelectronic devices

Cited by 36 publications

References 30 publications

Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors

Designing Metallic and Insulating Nanocrystal Heterostructures to Fabricate Highly Sensitive and Solution Processed Strain Gauges for Wearable Sensors

Tin(IV) Methylselenolate as a Low Temperature SnSe Precursor and Conductive “Glue” Between Colloidal Nanocrystals

Experimental study of the size-dependent photoluminescence emission of CBD-grown PbSe nanocrystals on glass

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