Trap engineering in solution processed PbSe quantum dots for high-speed MID-infrared photodetectors

Dolatyari, Mahboubeh; Rostami, Ali; Mathur, Sanjay; Klein, Axel

doi:10.1039/c8tc06093b

Cited by 37 publications

(29 citation statements)

References 68 publications

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“…This avoids the introduction of Br − and SCN − ion impurities into the sample (which occur with the tetrabutylammonium bromide and ammonium thiocyanate treatments, respectively) that could potentially be problematic in some scenarios and applications. We anticipate that the PbSe nanocrystal films with SnSe‐like interstitial material in this work could be promising for thin film transistors, and optoelectronics . PbSe is also an excellent thermoelectric material and Sn‐alloyed PbSe can function as topological crystalline insulator …”

Section: Resultsmentioning

confidence: 93%

“…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%

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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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Section: Resultsmentioning

confidence: 93%

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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“…Lead selenide (PbSe) CQDs have a tunable bandgap in the MWIR, but are less developed than HgTe CQDs for photodetection. 19 Heavy metal-free CQD alternatives include indium arsenide (InAs), indium antimo-nide (InSb), and their ternary alloy with IR absorptions tunable from SWIR to MWIR wavelengths. 20 Unfortunately, these heavy metal-free alternatives are much less developed.…”

Section: Making Strides Toward Commercial Cqd Ir Imagingmentioning

confidence: 99%

Bringing Colloidal Quantum Dots to Detector Technologies

Ackerman¹

2020

Information Display

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“…This interest arises mostly from the strong quantum confinement, and the broad size-tunability of the bandgap energies [9,10]. Therefore, photoluminescence emissions of lead chalcogenides NCs can cover the near-infrared region entirely, and specifically lead selenide (PbSe) NCs cover PL emissions over the mid-infrared wavelengths [11,12]. Efficient mid-infrared devices play an essential role in a variety of applications, including remote detection, environmental sensing, and gas analysis [13][14][15].…”

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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Trap engineering in solution processed PbSe quantum dots for high-speed MID-infrared photodetectors

Abstract: The ongoing quest to find methods to control the trap states in solution processed nanostructures (trap engineering) will revolutionise the applications of nanomaterials for optoelectronic purposes.

Cited by 37 publications

References 68 publications

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

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

Bringing Colloidal Quantum Dots to Detector Technologies

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

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