Achieving Near-Unity Photoluminescence Efficiency for Blue-Violet-Emitting Perovskite Nanocrystals

Mondal, Navendu; De, Apurba; Samanta, Anunay

doi:10.1021/acsenergylett.8b01909

Cited by 358 publications

(370 citation statements)

References 46 publications

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“…Figure 4c displays the steady-state PL spectra of PbS-PbX 2 and PbS-AI QD solid film. [50,51] A slower PL decay was observed for PbS-AI QD solid film compared with that of PbS-PbX 2 QD solid film. The timeresolved PL decay measurement was performed using a timecorrelated single-photon counting (TCSPC) technique, which could directly detect the dynamic of photoinduced charge carrier in CQD solid.…”

Section: Charge Recombination and Collectionmentioning

confidence: 95%

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Jia

Chen

Zheng

et al. 2019

Advanced Energy Materials

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absorption spectrum, low-cost, solutionprocessable fabrication, and compatibility with flexible substrates. [8][9][10][11] Furthermore, the surface ligand exchange of postsynthetic QDs allows for tailoring QD surface chemistry, which provides large freedom to fine-tune the optoelectronic properties of QDs, therefore engineering the device performance. [12][13][14] For the QDs in solar cell applications, the multiple excitation generation in QDs gives the possibility to overcome the Shockley-Queisser theoretical limitation on the power conversion efficiency (PCE) of a single-junction solar cell since the QD may produce more than one electron-hole pair after absorbed one high-energy photon. [15,16] Over the past few years, benefiting from the fundamental studies in controlling QD surface chemistry, device architecture, interfacial properties and electro-optics within the QD solar cell (QDSC) devices, significant progress was obtained and a PCE of more than 12% was achieved for the PbS QDSC. [14,17] Meanwhile, the QDSC has good stability both under continuous illumination and long-term storage under ambient conditions, showing great potential for the development of highly efficient and stable photovoltaic devices. [18,19] During the QD synthesis, the long native organic ligand (such as oleic acid (OA)) is generally applied to cover the QD surface to control the dot size and make the colloidal system stable in organic solvents. [20,21] However, when the QDs is used to construct a solar cell, such long organic ligands should be replaced by small surface binding species to decrease the distance between dots and meanwhile minimize QD surface traps, facilitating charge-transport within the QD solid. Insufficient ligand exchange will lead to oxidation on the QD surface, which affects the photovoltaic performance and stability of QDSCs. [22][23][24] Liquid-state ligand exchange approach provides an efficient way to replace the long organic ligand on the QD surface with small binding species, such as small organic molecules or lead halide (PbX 2 , X = Br or I). [2,25,26] The ligand-exchanged QDs are dispersed in a polar butylamine solvent forming a concentrated QD ink, which can be used for the deposition of a thick QD solid film with a single-step deposition technique, significantly decreasing the time for QD solid film deposition and improving material usage efficiency. [17,25] The QD solid film prepared with the QD ink shows better characteristics compared with that Liquid-state ligand exchange provides an efficient approach to passivate a quantum dot (QD) surface with small binding species and achieve a QD ink toward scalable QD solar cell (QDSC) production. Herein, experimental studies and theoretical simulations are combined to establish the physical principles of QD surface properties induced charge carrier recombination and collection in QDSCs. Ammonium iodide (AI) is used to thoroughly replace the native oleic acid ligand on the PbS QD surface forming a concentrated QD ink, which has high stability of more than 30 ...

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Section: Charge Recombination and Collectionmentioning

confidence: 95%

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Jia

Chen

Zheng

et al. 2019

Advanced Energy Materials

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“…Capping ligands are used to stabilize/solubilize nanocrystals in different solvents . Generally, primary amines are used as capping ligands during the synthesis of lead halide perovskite nanocrystals .…”

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confidence: 99%

Role of Capped Oleyl Amine in the Moisture‐Induced Structural Transformation of CsPbBr₃ Perovskite Nanocrystals

Sandeep

Gopika

Revathi

2019

Physica Rapid Research Ltrs

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The moisture‐induced structural decomposition of lead halide perovskites is the major challenge in solar cells and light‐emitting diodes based on perovskites as the active material. The presence of moisture results in the structural conversion of cubic 3D CsPbBr3 nanocrystals to 2D CsPb2Br5 nanosheets before its decomposition to PbBr2. The capping agent used, oleyl amine, plays a crucial role in this structural transformation. The presence of moisture converts the capping agent, oleyl amine, to its salt, which transforms the 3D CsPbBr3 perovskite nanocrystals to 2D CsPb2Br5 nanosheets. Further, these CsPb2Br5 nanosheets decompose to trigonal PbBr2, in the presence of higher amounts of water. Also, the amount of capping agent, oleyl amine, plays an important role in the rate of moisture‐induced structural transformations. The rate of decomposition increases with the amount of oleyl amine used as a result of the reaction of water with the excess ligands. By revealing the exact mechanism of the structural alterations in the presence of water, new design strategies can be used to prevent the decomposition of perovskites.

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“…Recently, PLQY values of 98% were described for blue‐violet–emitting CsPbCl 3 perovskite NCs, which were treated with CdCl 2 after the synthesis. This postsynthetic treatment of the perovskite NCs does not show any effect on the position of the photoluminescence (PL) peak and the spectral width . We found that OIHP semiconductor quantum wells thermodynamically prefer to form lamellar superlattices, which exhibit the AIE characteristics.…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 85%

“…As we discussed earlier, the PLQYs for semiconductor perovskite emitters are approaching nearly 100% in both solutions and solids . Apart from that, it is interesting to investigate the blue and red emissions in perovskites QDs.…”

Section: Development Of Rgb Perovskite Qdsmentioning

confidence: 90%

“…A lot of scientific work was performed in the last years to further improve the optical properties of these interesting perovskite NCs . The new class of nanomaterials exhibits high PLQY values for blue, green, and red emission compared with other inorganic quantum dot classes such as CdSe or InP NCs . Near‐unity PLQYs in the quantum dot solids for the lead bromide perovskite systems have been reported .…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

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Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

et al. 2019

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Perovskite quantum dots (QDs) are emerging as one of the most promising candidates for the monochromatic light‐emitting diodes (LEDs) approaching the Rec. 2020 color gamut due to their extremely narrow emission bandwidth. Another important aspect are the high photoluminescence quantum yield (PLQY) values that can be obtained either in solution or thin films making these materials as promising candidates for optoelectronic applications such as LEDs or solar cells. Considerable research efforts in chemistry, chemical engineering, solid‐state physics, and material sciences have been made in the past years. The new opportunity in the field of semiconductor quantum dots is still in the beginning phase and is expected to remain active in the following years. Here, in this invited commentary, we briefly discuss and summarize the opportunities and challenges in both fundamental and technological aspects, based on our work and the recent work in this field.

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Achieving Near-Unity Photoluminescence Efficiency for Blue-Violet-Emitting Perovskite Nanocrystals

Cited by 358 publications

References 46 publications

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Role of Capped Oleyl Amine in the Moisture‐Induced Structural Transformation of CsPbBr₃ Perovskite Nanocrystals

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

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Achieving Near-Unity Photoluminescence Efficiency for Blue-Violet-Emitting Perovskite Nanocrystals

Cited by 358 publications

References 46 publications

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Highly Stabilized Quantum Dot Ink for Efficient Infrared Light Absorbing Solar Cells

Role of Capped Oleyl Amine in the Moisture‐Induced Structural Transformation of CsPbBr3 Perovskite Nanocrystals

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

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Role of Capped Oleyl Amine in the Moisture‐Induced Structural Transformation of CsPbBr₃ Perovskite Nanocrystals