Ligand Exchange of Colloidal ZnO Nanocrystals from the High Temperature and Nonaqueous Approach

Luo, Jun; Dai, Xingliang; Bai, Sai; Jin, Yizheng; Ye, Zhizhen; Guo, Xiaojun

doi:10.5101/nml.v5i4.p274-280

Cited by 3 publications

(4 citation statements)

References 20 publications

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“…XRD patterns (Fig. 1 b) for different thicknesses of ZnO films indicate that the crystallinity with wurtzite structure could be enhanced as the thickness increased [ 15 , 36 ]. Moreover, the c -axis oriented (002) intensity of thicker ZnO film is stronger than the thinner ones, demonstrating the orientation growth which may improve the carrier transport mobility [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the window layer attracts less attention in spit that it plays the key roles in extracting and transporting charge carriers in heterojunction. As an n-type window layer, ZnO is an ideal candidate due to its relatively high electron mobility, environment stability, and high transparency [ 15 ]. Even utilizing the same window layer of ZnO, different groups utilized varied thickness and obtained over 8% conversion efficiency [ 12 , 14 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer

et al. 2017

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Comparing with hot researches in absorber layer, window layer has attracted less attention in PbS quantum dot solar cells (QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on. Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V oc of 18%, J sc of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer. Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-016-0124-2) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer

et al. 2017

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“…Solution-based chemistry techniques can leave insulating surface chemistries on the nanoparticle that can be time consuming to remove before device integration. This is important because ligands can interfere with optoelectronic device performance and efficiency by inhibiting charge transport and preventing the close-packing of particles [ 51 , 52 ]. Additionally, PLFL offers a method to produce bimodal size distributions, further enhancing particle packing which can improve performance [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

ZnO Nanoparticle/Graphene Hybrid Photodetectors via Laser Fragmentation in Liquid

et al. 2020

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By combining the enhanced photosensitive properties of zinc oxide nanoparticles and the excellent transport characteristics of graphene, UV-sensitive, solar-blind hybrid optoelectronic devices have been demonstrated. These hybrid devices offer high responsivity and gain, making them well suited for photodetector applications. Here, we report a hybrid ZnO nanoparticle/graphene phototransistor that exhibits a responsivity up to 4 × 104 AW−1 and gain of up to 1.3 × 105 with high UV wavelength selectivity. ZnO nanoparticles were synthesized by pulsed laser fragmentation in liquid to attain a simple, efficient, ligand-free method for nanoparticle fabrication. By combining simple fabrication processes with a promising device architecture, highly sensitive ZnO nanoparticle/graphene UV photodetectors were successfully demonstrated.

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“…It has already been demonstrated that ZnO is an excellent candidate as an electron-transport layer because it possesses relatively high mobility, high optical transparency (wide band gap), abundance, and ease of fabrication and processing. 18,19 The excellent photosensitive response of ZnO to ultraviolet (UV) radiation is also well-known and adds to its utility in solar cells. 20 Several groups have explored various modifications to ZnO films and monitored the effect of these modifications in solar cells to achieve >8% PCE.…”

Section: ■ Introductionmentioning

confidence: 99%

Impact of Background Oxygen Pressure on the Pulsed-Laser Deposition of ZnO Nanolayers and on Their Corresponding Performance as Electron Acceptors in PbS Quantum-Dot Solar Cells

Dong

Liu

Hara

et al. 2019

ACS Appl. Nano Mater.

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ZnO films are commonly employed as n-type semiconductors in heterojunctions with PbS colloidal quantum-dot (CQDs) films because of their outstanding optical transparency and electron acceptor properties, yet studies of the impact of ZnO film microstructure, composition, and defect qualities on the solar-cell performance are quite limited. Here we report on the fabrication of ZnO films via pulsed-laser deposition and use these films to investigate how different morphologies affect the PbS CQD solar-cell performance. By modification of the background gas O 2 pressures during the ZnO deposition process, the device performance approaching a 7.8% energy conversion efficiency is achieved with an O 2 pressure of 100 mTorr. Higher or lower O 2 pressures led to significantly lower device efficiency. We employ various materials and device characterizations to highlight the differences in the physical properties introduced by the fabrication oxygen pressure. In particular, we have found that the differences in the type and density of ZnO oxygen defects are the key factors behind the dispersion in solar-cell performances.

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Ligand Exchange of Colloidal ZnO Nanocrystals from the High Temperature and Nonaqueous Approach

Cited by 3 publications

References 20 publications

Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer

Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer

ZnO Nanoparticle/Graphene Hybrid Photodetectors via Laser Fragmentation in Liquid

Impact of Background Oxygen Pressure on the Pulsed-Laser Deposition of ZnO Nanolayers and on Their Corresponding Performance as Electron Acceptors in PbS Quantum-Dot Solar Cells

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