A5024823391- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Perovskite Materials and Applications
- Conducting polymers and applications
- Nanocluster Synthesis and Applications
- Copper-based nanomaterials and applications
- Organic Electronics and Photovoltaics
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Nanowire Synthesis and Applications
- Solid-state spectroscopy and crystallography
- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Photonic Crystal and Fiber Optics
- Organic Light-Emitting Diodes Research
- Advanced Nanomaterials in Catalysis
- 2D Materials and Applications
- Advanced Memory and Neural Computing
- Thin-Film Transistor Technologies
- Laser-Matter Interactions and Applications
- Photoreceptor and optogenetics research
- Carbon and Quantum Dots Applications
- Plasmonic and Surface Plasmon Research
- Graphene and Nanomaterials Applications
Soochow University
2016-2025
Changchun Institute of Optics, Fine Mechanics and Physics
2020-2022
Indiana University Bloomington
2018-2021
Chinese Academy of Sciences
2020-2021
University of California, Berkeley
2016-2017
Lawrence Berkeley National Laboratory
2017
Kavli Energy NanoScience Institute
2016
Suzhou Research Institute
2014
Zero to Three
2013
While convenient solution-based procedures have been realized for the synthesis of colloidal perovskite nanocrystals, impact surfactant ligands on shape, size, and surface properties still remains poorly understood, which calls a more detailed structure–morphology study. Herein we systematically varied hydrocarbon chain composition carboxylic acids amines to investigate chemistry independent acid amine size shape nanocrystals. Solution phase studies purified nanocrystal samples by 1H NMR IR...
Lead halide perovskite nanocrystals (NCs) have emerged as attractive nanomaterials owing to their excellent optical and optoelectronic properties. Their intrinsic instability soft nature enable a post-synthetic controlled chemical transformation. We studied ligand mediated transformation of presynthesized CsPbBr3 NCs new type lead-halide depleted derivative nanocrystal, namely Cs4PbBr6. The is initiated by amine addition, the use alkyl-thiol ligands greatly improves size uniformity stability...
Abstract Lead sulphide (PbS) nanocrystals (NCs) are promising materials for low-cost, high-performance optoelectronic devices. So far, PbS NCs have to be first synthesized with long-alkyl chain organic surface ligands and then ligand-exchanged shorter (two-steps) enable charge transport. However, the initial synthesis of insulated show no necessity ligand-exchange process is tedious extravagant. Herein, we developed a direct one-step, scalable synthetic method iodide capped (PbS-I) NC inks....
Instability in mixed-halide perovskites (MHPs) is a key issue limiting perovskite solar cells and light-emitting diodes (LEDs). One form of instability arises during the processing MHP quantum dots using an antisolvent to precipitate purify forming surface traps that lead decreased luminescence, compromised colloidal stability, emission broadening. Here, introduction inorganic ligands antisolvents used dot purification reported order overcome this problem. MHPs are colloidally stable for...
We provide a comprehensive review of the latest research progress and challenges associated with various tandem solar cells based on lead chalcogenide (PbX, X = S, Se) quantum dot (QD) materials (including QD/QD, organic/QD, perovskite/QD).
Solution-processed hybrid solar cells employing a low band-gap polymer and PbSxSe1-x alloy nanocrystals, achieving record high PCE of 5.50% an optimal FF 67% are presented. The remarkable device efficiency can be attributed to the high-performance active materials, polymer/NCs ratio and, more importantly, vertical donor/(donor:acceptor)/acceptor structure which benefits charge dissociation transport. As service our authors readers, this journal provides supporting information supplied by...
PbS quantum-dot (QD) solar cells are promising candidates for low-cost solution-processed photovoltaics. However, the device fabrication usually requires ten more times film deposition and rinsing steps, which is not ideal scalable manufacturing. Here, a greatly simplified processing demonstrated by replacing methanol with acetonitrile (ACN) as solvent. It discovered that ACN can effectively "cure" cracks generated from volume loss during solid-state ligand-exchange process, enables of thick...
Abstract Current efforts on lead sulfide quantum dot (PbS QD) solar cells are mostly paid to the device architecture engineering and postsynthetic surface modification, while very rare work regarding optimization of PbS synthesis is reported. Here, QDs successfully synthesized using PbO PbAc 2 · 3H O as sources. QD based PbAc‐PbS have demonstrated a high power conversion efficiency (PCE) 10.82% (and independently certificated values 10.62%), which significantly higher than PCE 9.39% for...
New-generation solar cells based on colloidal lead chalcogenide (PbX) quantum dots (CQDs) are promising low-cost solution-processed photovoltaics.
Inverted planar heterojunction perovskite solar cells employing different polymers, poly{[N,N′-bis(2-octyldodecyl)-1,4,5,8-naphthalene diimide-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (N2200), poly{[N,N′-bis(alkyl)-1,4,5,8-naphthalene diimide-2,6-diyl-alt-5,5′-di(thiophen-2-yl)-2,2′-(E)-2-(2-(thiophen-2-yl)vinyl)thiophene]} (PNVT-8), and PNDI2OD-TT as electron-transporting material (ETM) have been investigated for the first time. The best device performance was obtained when N2200 applied ETM,...
A multiple-passivation strategy by solution-phase ligand engineering in lead halide exchanged QDs ink is presented, which result remarkably improved colloidal stability of and enhanced device performance.
Abstract Almost all surfaces sensitive to the ambient environment are covered by water, whereas impacts of water on surface-dominated colloidal quantum dot (CQD) semiconductor electronics have rarely been explored. Here, strongly hydrogen-bonded hydroxylated lead sulfide (PbS) CQD is identified. The could pilot thermally induced evolution surface chemical environment, which significantly influences nanostructures, carrier dynamics, and trap behaviors in solar cells. aggravation hydroxylation...
The high open-circuit voltage (Voc ) loss arising from insufficient surface passivation is the main factor that limits efficiency of current lead sulfide colloidal quantum dots (PbS CQDs) solar cell. Here, synergistic performed in direct synthesis conductive PbS CQD inks by introducing multifunctional ligands to well coordinate complicated CQDs with thermodynamically optimal configuration. improved effect intactly delivered final photovoltaic device, leading an order lower trap density and...
The zinc oxide (ZnO) nanoparticles (NPs) are well-documented as an excellent electron transport layer (ETL) in optoelectronic devices. However, the intrinsic surface flaw of ZnO NPs can easily result serious recombination carriers. Exploring effective passivation methods is essential to maximize device's performance. Herein, a hybrid strategy explored for first time improve quality ETL by incorporating stable organic open-shell donor-acceptor type diradicaloids. high electron-donating...
PbS quantum dots (QDs) are promising building blocks for solution-processed short-wavelength infrared (SWIR) devices. The recently developed direct synthesis of semi-conductive QD inks has substantially simplified the preparation processing and reduced material cost, while facing challenge to synthesize large-size QDs with absorption covering SWIR region. Herein, we first time realize a low-cost, scalable after an extensive investigation reaction kinetics. Finally, based on these inks, solar...
Abstract Metal-oxide nanocrystals doped with aliovalent atoms can exhibit tunable infrared localized surface plasmon resonances (LSPRs). Yet, the range of dopant types and concentrations remains limited for many metal-oxide hosts, largely because difficulty in establishing reaction kinetics that favors incorporation by using co-thermolysis method. Here we develop cation-exchange reactions to introduce p-type dopants (Cu + , Ag etc.) into n-type nanocrystals, producing programmable LSPR...
A new approach to synthesize self-doped colloidal Cu3−xP NCs with controlled size and localized surface plasmon resonance absorption is reported. These show ultrafast exciton dynamics huge optical nonlinearities due plasmonic resonances, which afford the first demonstration of as simple, effective, solution-processed nonlinear absorbers for high-energy Q-switched fiber laser. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials...
Cesium-doped ZnO nanoparticle was synthesized for application in PbS QD solar cells as an efficient electron transporting layer.
Abstract For the first time, plasmonic gold bipyramids (Au BPs) are introduced to PbS colloidal quantum dot (CQD) solar cells for improved infrared light harvesting. The localized surface plasmon resonance peaks of Au BPs matches perfectly with absorption conventional CQDs. Owing geometrical novelty BPs, they exhibit significantly stronger far‐field scattering effect and near‐field enhancement than nanospheres (NSs). Consequently, device open‐circuit voltage ( V oc ) short‐circuit current J...
Abstract The integration of graphene with colloidal quantum dots (QDs) that have tunable light absorption affords new opportunities for optoelectronic applications as such a hybrid system solves the problem both quantity and mobility photocarriers. In this work, comprising monolayer self‐doped copper phosphide (Cu 3− x P) QDs is developed efficient broadband photodetection. Unlike conventional PbS are toxic, Cu P environmental friendly plasmonic resonant in near‐infrared (NIR) wavelength....
We have successfully demonstrated the effect of a thin organic bulk-heterojunction (BHJ) interlayer on improving photovoltaic performance lead sulfide (PbS) colloidal quantum dot (CQD) solar cells. Multiple BHJ films with PTB7-Th blending various N-type acceptors been introduced as hole-transporting layer (HTL) in PbS Significant enhancement Voc was achieved hybrid devices compared to based conventional HTLs like 1,2-ethanedithiol-treated PbS. Systematic characterizations reveal that...
This study reports the fabrication of stable, high‐performance, simple structured tandem solar cells based on PbS colloidal quantum dots (CQDs) under ambient air. also reveals detailed device engineering to deposit each functional layer in subcells at low temperature avoid damage CQDs and meanwhile makes process compatible flexible plastic substrate. Two efficient recombination layers (RLs) are rationally designed connect two series. The use solution‐processed RL with an organic PEDOT:PSS...
The power conversion efficiency (PCE) of solution-processed organic-inorganic mixed halide perovskite solar cells has achieved rapid improvement. However, it is imperative to minimize the voltage deficit (Woc = Eg /q - Voc ) for their PCE approach theoretical limit. Herein, strategy depositing homologous bromide salts on surface achieve a and bulk passivation fabrication with high open-circuit reported. Distinct from conclusions given by previous works, that bromides such as FABr only react...
Their nanoscale size endows perovskite quantum dots (QDs) with processing flexibility and high tunability of optoelectronic properties. The vast surface area also provides an opportunity for ligand engineering to offer QDs extra protection, which however, will impede charge transport in the QD array. Currently, treatments that can balance both stability conductivity array remain a huge challenge. Here, we report situ growth atomic guanidinium lead iodide matrix on CsPbI3 QDs. In addition...