Ultrasmall Nanoplatelets: The Ultimate Tuning of Optoelectronic Properties

Zhou, Yufeng; Çelikin, Mert; Camellini, Andrea; Sirigu, Gianluca; Tong, Xin; Liu, Jin; Basu, Kaustubh; Barba, David; Ma, Dongling; Sun, Shuhui; Vidal, François; Zavelani‐Rossi, M.; Wang, Zhiming M.; Zhao, Haiguang; Vomiero, Alberto; Rosei, Federico

doi:10.1002/aenm.201602728

Cited by 35 publications

(37 citation statements)

References 53 publications

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“…[ 5a,14 ] However, the lateral dimension of 2D PbS NPLs is generally at hundred‐nanometer scale, resulting in unfavorable band energy levels. [ 15 ] In addition, there are more surface trap states on larger NPLs, which can significantly decrease their PL quantum efficiencies and limit the subsequent photonic applications. [ 14b ] Although bottom‐up approaches are the most widely used strategies to synthesize 2D PbS NPLs, their use makes it still hard to control the lateral size under 10 nm.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Small 2D PbS Nanoplatelets: Liquid‐Phase Exfoliation and Emerging Applications for Photo‐Electrochemical Photodetectors

Gao

Chen

Wang

et al. 2021

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2D PbS nanoplatelets (NPLs) form an emerging class of photoactive materials and have been proposed as robust materials for high‐performance optoelectronic devices. However, the main drawback of PbS NPLs is the large lateral size, which inhibits their further investigations and practical applications. In this work, ultra‐small 2D PbS NPLs with uniform lateral size (11.2 ± 1.7 nm) and thickness (3.7 ± 0.9 nm, ≈6 layers) have been successfully fabricated by a facile liquid‐phase exfoliation approach. Their transient optical response and photo‐response behavior are evaluated by femtosecond‐resolved transient absorption and photo‐electrochemical (PEC) measurements. It is shown that the NPLs‐based photodetectors (PDs) exhibit excellent photo‐response performance from UV to the visible range, showing extremely high photo‐responsivity (27.81 mA W−1) and remarkable detectivity (3.96 × 1010 Jones), which are figures of merit outperforming currently reported PEC‐type PDs. The outstanding properties are further analyzed based on the results of first‐principle calculations, including electronic band structure and free energies for the oxygen evolution reaction process. This work highlights promising applications of ultra‐small 2D PbS NPLs with the potential for breakthrough developments also in other fields of optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Ultra‐Small 2D PbS Nanoplatelets: Liquid‐Phase Exfoliation and Emerging Applications for Photo‐Electrochemical Photodetectors

Gao

Chen

Wang

et al. 2021

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“…PbS sheets with a thickness of 2.2 nm had lateral dimensions of hundreds of nm and demonstrated a wide PL band centered at 790 nm. Since that time, PbS [ 10 , 11 , 12 , 13 , 14 , 15 ], PbSe [ 16 , 17 ], PbSe 1− x S x [ 18 ], and HgTe [ 19 , 20 ] NIR-emitting NPLs were synthesized using both oriented attachment and cation exchange procedures. A different strategy to obtain NIR-emitting NPLs was to dope visible-emitting CdSe NPLs with Ag [ 21 , 22 ] or Cu [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Photoluminescent Properties of PbSe Nanoplatelets

et al. 2020

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Semiconductor colloidal nanoplatelets (NPLs) are a promising new class of nanostructures that can bring much impact on lightning technologies, light-emitting diodes (LED), and laser fabrication. Indeed, great progress has been made in optimizing the optical properties of the NPLs for the visible spectral range, which has already made the implementation of a number of effective devices on their basis possible. To date, state-of-the-art near-infrared (NIR)-emitting NPLs are significantly inferior to their visible-range counterparts, although it would be fair to say that they received significantly less research attention so far. In this study, we report a comprehensive analysis of steady-state and time-dependent photoluminescence (PL) properties of four monolayered (ML) PbSe NPLs. The PL measurements are performed in a temperature range of 78–300 K, and their results are compared to those obtained for CdSe NPLs and PbSe quantum dots (QDs). We show that multiple emissive states, both band-edge and trap-related, are responsible for the formation of the NPLs’ PL band. We demonstrate that the widening of the PL band is caused by the inhomogeneous broadening rather than homogeneous one, and analyze the possible contributions to PL broadening.

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“…[1][2] During this process, most works focus on deposition methods, interface engineering, hysteresis in the current-voltage curves of PSCs and the application of new functional materials. [3][4][5][6][7][8][9][10][11][12] In order to make it more conducive to practical application, the degradation mechanism of perovskite in air and the fabrication process of larger sized devices are investigated by a lot of research groups. [13][14][15][16][17] As a result, precisely controlling the growth of perovskite crystals has also become an interesting topic to explore the fundamental properties and growth dynamics of high quality perovskite films for efficient solar cells.…”

Section: Introductionmentioning

confidence: 99%

Stitching triple cation perovskite by a mixed anti-solvent process for high performance perovskite solar cells

et al. 2017

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With the rapid development of organic-inorganic lead halide perovskite photovoltaics, increasingly more attentions are paid to explore the growth mechanism and precisely control the quality of perovskite films. In this study, we propose a "stitching effect" to fabricate high quality perovskite films by using chlorobenzene (CB) as an anti-solvent and isopropyl alcohol (IPA) as an additive into this anti-solvent. Because of the existence of IPA, CB can be efficiently released from the gaps of perovskite precursors and the perovskite film formation can be slightly modified in a controlled manner. More homogeneous surface morphology and larger grain size of perovskite films were achieved via this process. The reduced grain boundaries ensure low surface defect density and good carrier transport in the perovskite layer. Meanwhile, we also performed the Fourier transform infrared (FTIR) spectroscopy to investigate the film growth mechanism of unannealed and annealed perovskite films. Solar cells fabricated by using the "stitching effect" exhibited a best efficiency of 19.2%. Our results show that solvent and solvent additives dramatically influenced the formation and crystallization processes for perovskite materials due to their different coordination and extraction capabilities. This method presents a new path towards controlling the growth and morphology of perovskite films.

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Ultrasmall Nanoplatelets: The Ultimate Tuning of Optoelectronic Properties

Cited by 35 publications

References 53 publications

Ultra‐Small 2D PbS Nanoplatelets: Liquid‐Phase Exfoliation and Emerging Applications for Photo‐Electrochemical Photodetectors

Ultra‐Small 2D PbS Nanoplatelets: Liquid‐Phase Exfoliation and Emerging Applications for Photo‐Electrochemical Photodetectors

Temperature-Dependent Photoluminescent Properties of PbSe Nanoplatelets

Stitching triple cation perovskite by a mixed anti-solvent process for high performance perovskite solar cells

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