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Yun‐Fei Li Shu‐Yu Chou Peng Huang Changtao Xiao Xiaofeng Liu Yu Xie Fangchao Zhao Yilong Huang Jing Feng Haizheng Zhong Hong‐Bo Sun Qibing Pei 《Advanced materials (Deerfield Beach, Fla.)》2019,31(22)
Stretchable light‐emitting diodes (LEDs) and electroluminescent capacitors have been reported to potentially bring new opportunities to wearable electronics; however, these devices lack in efficiency and/or stretchability. Here, a stretchable organometal‐halide‐perovskite quantum‐dot LED with both high efficiency and mechanical compliancy is demonstrated. The hybrid device employs an ultrathin (<3 µm) LED structure conformed on a surface‐wrinkled elastomer substrate. Its luminescent efficiency is up to 9.2 cd A?1, which is 70% higher than a control diode fabricated on the rigid indium tin oxide/glass substrate. Mechanical deformations up to 50% tensile strain do not induce significant loss of the electroluminescent property. The device can survive 1000 stretch–release cycles of 20% tensile strain with small fluctuations in electroluminescent performance. 相似文献
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Effect of Solvent Environment on Colloidal‐Quantum‐Dot Solar‐Cell Manufacturability and Performance
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Ahmad R. Kirmani Graham H. Carey Maged Abdelsamie Buyi Yan Dongkyu Cha Lisa R. Rollny Xiaoyu Cui Edward H. Sargent Aram Amassian 《Advanced materials (Deerfield Beach, Fla.)》2014,26(27):4717-4723
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A Self‐Quenching‐Resistant Carbon‐Dot Powder with Tunable Solid‐State Fluorescence and Construction of Dual‐Fluorescence Morphologies for White Light‐Emission
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Yonghao Chen Mingtao Zheng Yong Xiao Hanwu Dong Haoran Zhang Jianle Zhuang Hang Hu Bingfu Lei Yingliang Liu 《Advanced materials (Deerfield Beach, Fla.)》2016,28(2):312-318
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Jun Pan Li Na Quan Yongbiao Zhao Wei Peng Banavoth Murali Smritakshi P. Sarmah Mingjian Yuan Lutfan Sinatra Noktan M. Alyami Jiakai Liu Emre Yassitepe Zhenyu Yang Oleksandr Voznyy Riccardo Comin Mohamed N. Hedhili Omar F. Mohammed Zheng Hong Lu Dong Ha Kim Edward H. Sargent Osman M. Bakr 《Advanced materials (Deerfield Beach, Fla.)》2016,28(39):8718-8725
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Min‐Jae Choi YongJoo Kim Hunhee Lim Erkki Alarousu Aniruddha Adhikari Basamat S. Shaheen Yong Ho Kim Omar F. Mohammed Edward. H. Sargent Jin Young Kim Yeon Sik Jung 《Advanced materials (Deerfield Beach, Fla.)》2019,31(32)
Solution‐processed colloidal quantum dots (CQDs) are attractive materials for the realization of low‐cost and efficient optoelectronic devices. Although impressive CQD‐solar‐cell performance has been achieved, the fabrication of CQD films is still limited to laboratory‐scale small areas because of the complicated deposition of CQD inks. Large‐area, uniform deposition of lead sulfide (PbS) CQD inks is successfully realized for photovoltaic device applications by engineering the solute redistribution of CQD droplets. It is shown experimentally and theoretically that the solute‐redistribution dynamics of CQD droplets are highly dependent on the movement of the contact line and on the evaporation kinetics of the solvent. By lowering the friction constant of the contact line and increasing the evaporation rate of the droplets, a uniform deposition of CQD ink in length and width over large areas is realized. By utilizing a spray‐coating process, large‐area (up to 100 cm2) CQD films are fabricated with 3–7% thickness variation on various substrates including glass, indium tin oxide glass, and polyethylene terephthalate. Furthermore, scalable fabrication of CQD solar cells is demonstrated with 100 cm2 CQD films which exhibits a notably high efficiency of 8.10%. 相似文献
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Carbon Nanotube‐Quantum Dot Nanohybrids: Coupling with Single‐Particle Control in Aqueous Solution
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Antonio Attanzio Andrei Sapelkin Felice Gesuele Arend van der Zande William P. Gillin Ming Zheng Matteo Palma 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(16)
A strategy is reported for the controlled assembly of organic‐inorganic heterostructures consisting of individual single‐walled carbon nanotubes (SWCNTs) selectively coupled to single semiconductor quantum dots (QDs). The assembly in aqueous solution was controlled towards the formation of monofunctionalized SWCNT‐QD structures. Photoluminescence studies in solution, and on surfaces at the single nanohybrid level, showed evidence of electronic coupling between the two nanostructures. The ability to covalently couple heterostructures with single particle control is crucial for the design of novel QD‐based optoelectronic and light‐energy conversion devices. 相似文献
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Enhanced Open‐Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity‐Controlled Solution‐Phase Ligand Exchange
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Jea Woong Jo Jongmin Choi F. Pelayo García de Arquer Grant Walters Bin Sun Olivier Ouellette Junghwan Kim Andrew H. Proppe Rafael Quintero‐Bermudez James Fan Jixian Xu Chih Shan Tan Oleksandr Voznyy Edward H. Sargent 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open‐circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution‐phase ligand exchange that, via judicious incorporation of reactivity‐engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved. 相似文献
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High‐Efficiency Photovoltaic Devices using Trap‐Controlled Quantum‐Dot Ink prepared via Phase‐Transfer Exchange
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Havid Aqoma Muhibullah Al Mubarok Wisnu Tantyo Hadmojo Eun‐Hye Lee Tae‐Wook Kim Tae Kyu Ahn Seung‐Hwan Oh Sung‐Yeon Jang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(19)
Colloidal‐quantum‐dot (CQD) photovoltaic devices are promising candidates for low‐cost power sources owing to their low‐temperature solution processability and bandgap tunability. A power conversion efficiency (PCE) of >10% is achieved for these devices; however, there are several remaining obstacles to their commercialization, including their high energy loss due to surface trap states and the complexity of the multiple‐step CQD‐layer‐deposition process. Herein, high‐efficiency photovoltaic devices prepared with CQD‐ink using a phase‐transfer‐exchange (PTE) method are reported. Using CQD‐ink, the fabrication of active layers by single‐step coating and the suppression of surface trap states are achieved simultaneously. The CQD‐ink photovoltaic devices achieve much higher PCEs (10.15% with a certified PCE of 9.61%) than the control devices (7.85%) owing to improved charge drift and diffusion. Notably, the CQD‐ink devices show much lower energy loss than other reported high‐efficiency CQD devices. This result reveals that the PTE method is an effective strategy for controlling trap states in CQDs. 相似文献
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A Layer‐by‐Layer ZnO Nanoparticle–PbS Quantum Dot Self‐Assembly Platform for Ultrafast Interfacial Electron Injection
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Mohamed Eita Anwar Usman Ala'a O. El‐Ballouli Erkki Alarousu Osman M. Bakr Omar F. Mohammed 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(1):112-118
Absorbent layers of semiconductor quantum dots (QDs) are now used as material platforms for low‐cost, high‐performance solar cells. The semiconductor metal oxide nanoparticles as an acceptor layer have become an integral part of the next generation solar cell. To achieve sufficient electron transfer and subsequently high conversion efficiency in these solar cells, however, energy‐level alignment and interfacial contact between the donor and the acceptor units are needed. Here, the layer‐by‐layer (LbL) technique is used to assemble ZnO nanoparticles (NPs), providing adequate PbS QD uptake to achieve greater interfacial contact compared with traditional sputtering methods. Electron injection at the PbS QD and ZnO NP interface is investigated using broadband transient absorption spectroscopy with 120 femtosecond temporal resolution. The results indicate that electron injection from photoexcited PbS QDs to ZnO NPs occurs on a time scale of a few hundred femtoseconds. This observation is supported by the interfacial electronic‐energy alignment between the donor and acceptor moieties. Finally, due to the combination of large interfacial contact and ultrafast electron injection, this proposed platform of assembled thin films holds promise for a variety of solar cell architectures and other settings that principally rely on interfacial contact, such as photocatalysis. 相似文献
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Daniel M. Balazs Bartosz M. Matysiak Jamo Momand Artem G. Shulga Maria Ibáñez Maksym V. Kovalenko Bart J. Kooi Maria Antonietta Loi 《Advanced materials (Deerfield Beach, Fla.)》2018,30(38)
Colloidal quantum dots (CQDs) are nanoscale building blocks for bottom‐up fabrication of semiconducting solids with tailorable properties beyond the possibilities of bulk materials. Achieving ordered, macroscopic crystal‐like assemblies has been in the focus of researchers for years, since it would allow exploitation of the quantum‐confinement‐based electronic properties with tunable dimensionality. Lead‐chalcogenide CQDs show especially strong tendencies to self‐organize into 2D superlattices with micrometer‐scale order, making the array fabrication fairly simple. However, most studies concentrate on the fundamentals of the assembly process, and none have investigated the electronic properties and their dependence on the nanoscale structure induced by different ligands. Here, it is discussed how different chemical treatments on the initial superlattices affect the nanostructure, the optical, and the electronic‐transport properties. Transistors with average two‐terminal electron mobilities of 13 cm2 V?1 s?1 and contactless mobility of 24 cm2 V?1 s?1 are obtained for small‐area superlattice field‐effect transistors. Such mobility values are the highest reported for CQD devices wherein the quantum confinement is substantially present and are comparable to those reported for heavy sintering. The considerable mobility with the simultaneous preservation of the optical bandgap displays the vast potential of colloidal QD superlattices for optoelectronic applications. 相似文献