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Interface engineering of high efficiency perovskite solar cells based on zno nanorods using atomic layer deposition

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Nano Research 2017年第3期10卷 1092-1103页

作者： Shibin Li Peng Zhang Yafei Wang Hojjatollah Sarvari Detao Liu Jiang Wu Yajie Yang Zhiming Wang Zhi David Chen School of Optoelectronic Information University of Electronic Science and Technology of China Chengdu 610054 China Department of Electrical & Computer Engineering and Center for Nanoscale Science & Engineering University of Kentucky Lexington Kentucky 40506 USA Department of Electronic and Electrical Engineering University College London Torrington Place London WC I E 7JE UK Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China

Despite the considerably improved efficiency of inorganic-organic metal hybrid perovskite solar cells （PSCs）, electron transport is still a challenging issue. In this paper, we report the use of zno nanorods prepared by hydrothermal self- assembly as the electron transport layer in perovskite solar cells. The efficiency of the perovskite solar cells is significantly enhanced by passivating the interfacial defects via atomic layer deposition of Al2O3 monolayers on the zno nanorods. By employing the Al2O3 monolayers, the average power conversion efficiency of methylammonium lead iodide PSCs was increased from 10.33% to 15.06%, and the highest efficiency obtained was 16.08%. We suggest that the passivation of defects using the atomic layer deposition of monolayers might provide a new pathway for the improvement of all types of PSCs..

关键词： perovskite solar cell zno nanorods oxygen vacancy Al2O3 monolayer charge recombination

Effects of surface adsorbed oxygen, applied voltage, and temperature on UV photoresponse of zno nanorods

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Chinese Physics B 2015年第10期24卷 501-506页

作者：宗仙丽朱荣 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University

The ultraviolet（UV） photoresponses of zno nanorods directly grown on and between two micro Au-electrodes by using electric-field-assisted wet chemical method are measured comprehensively under different conditions, including ambient environment, applied bias voltage, gate voltage and temperature. Experimental results indicate that the photoresponses of the zno nanorods can be modulated by surface oxygen adsorptions, applied voltages, as well as temperatures. A model taking into account both surface adsorbed oxygen and electron-hole activities inside zno nanorods is proposed. The enhancement effect of the bias voltage on photoresponse is also analyzed. Experimental results shows that the UV response time（to 63%） of zno nanorods in air and at 59°C could be shortened from 34.8 s to 0.24 s with a bias of 4 V applied between anode and cathode.

关键词： zno nanorods UV photoresponse surface effect applied voltage effect

Growth of Variable Aspect Ratio zno nanorods by Solochemical Processing

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Journal of Materials Science & Technology 2015年第1期31卷 10-15页

作者： Marivone Gusatti Daniel A.R.Souza Nivaldo C.Kuhnen Humberto G.Riella Departamento de Engenharia Química e Engenharia de Alimentos Programa de Pós-Graduacao em Engenharia Química LABMAC Universidade Federal de Santa Catarina (UFSC) Campus UniversitárioCP 476 Florianópolis Santa Catarina 88040-900 Brazil

In this work,variable aspect ratio（length divided by diameter） zinc oxide nanorods were synthesized through a simple solochemical method by reacting a Zn2+precursor with sodium hydroxide at low reaction *** analysis of the X-ray diffraction data indicated that the samples had hexagonal wurtzite structure and nanometric size *** transmission electron microscopy（TEM） images of the products prepared at60 and 80 ℃ exhibited rod-like architecture,showing that the reaction temperature did not affect the zno *** average aspect ratio of the zno nanorods decreased from 3.4 to 2.4 when the reaction temperature was raised from 60 to 80 ℃.The samples presented a blue shift in the excitonic absorption compared to zno bulk that increased alongside with reaction *** addition,this research investigated the results obtained by varying the concentration of zinc chloride *** the same temperature,it could be verified that when the zinc concentration was increased,the diameter of the zno nanorods also slightly increased,and much shorter nanorods were achieved,especially in the reactions performed at 50 and 70 ℃.Finally,the growth mechanism of the zno nanostructures was proposed based on the results obtained by changing the zinc precursor concentration and reaction temperature.

关键词： Chemical synthesis zno nanorods Growth mechanism

High-performance textile piezoelectric pressure sensor with novel structural hierarchy based on zno nanorods array for wearable application

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Nano Research 2021年第11期14卷 3969-3976页

作者： Yongsong Tan Kun Yang Bo Wang Hui Li Lei Wang Chaoxia Wang Key Laboratory of Eco-Textile Ministry of EducationCollege of Textile Science and EngineeringJiangnan University1800 Lihu RoadWuxi214122China Institute of Biomedical&Health Engineering Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China

With the increasing demand for smart wearable clothing, the textile piezoelectric pressure sensor (T-PEPS) that can harvest mechanical energy directly has attracted significant attention. However, the current challenge of T-PEPS lies in remaining the outstanding output performance without compromising its wearing comfort. Here, a novel structural hierarchy T-PEPS based on the single-crystalline zno nanorods are designed. The T-PEPS is constructed with three layers mode consisting of a polyvinylidene fluoride (PVDF) membrane, the top and bottom layers of conductive rGO polyester (PET) fabrics with self-orientation zno nanorods. As a result, the as-fabricated T-PEPS shows low detection limit up to 8.71 Pa, high output voltage to 11.47 V and superior mechanical stability. The sensitivity of the sensor is 0.62 V·kPa−1 in the pressure range of 0–2.25 kPa. Meanwhile, the T-PEPS is employed to detect human movements such as bending/relaxation motion of the wrist, bending/stretching motion of each finger. It is demonstrated that the T-PEPS can be up-scaled to promote the application of wearable sensor platforms and self-powered devices.

关键词： smart wearable clothing textile piezoelectric pressure sensor(T-PEPS) zno nanorods conductive rGO@polyester(PET)fabrics

Vertically coupled zno nanorods on MoS2 monolayers with enhanced Raman and photoluminescence emission

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Nano Research 2015年第3期8卷 743-750页

作者： Kenan Zhang Yun Zhang Tianning Zhang Wenjing Dong Tiaoxing Wei Yan Sun Xin Chen Guozhen Shen Ning Dai National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

Hybrid structures composed of layered materials have received much attention due to their exceptional tunable optical, electronic and catalytic properties. Here, we describe a hydrothermal strategy for coupling vertical zno nanorods on MoS2 monolayers without a catalyst. These vapor-solid-grown MoS2 monolayers aid in growing vertical zno nanorods via epitaxy. Enhanced Raman and photoluminescence emissions were observed from the MoS2 monolayers under the zno nanorods in these coupled structures, which was attributed to the light antenna effect of the zno nanorods. These hybrid and incorporation protocols for layered materials will provide new perspectives and opportunities for promoting the construction of heterojunctions with adjustable layered structures leading to fascinating fundamental phenomena and advanced devices.

关键词： MoS2 monolayers zno nanorods Raman photoluminescence

Ag-doped zno nanorods synthesized by two-step method

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Chinese Physics B 2012年第11期21卷 373-377页

作者：陈先梅冀勇郜小勇赵显伟 Key Laboratory of Material Physics of Ministry of Education School of Physics and EngineeringZhengzhou University

A two-step method is adopted to synthesize Ag-doped zno nanorods. A zno seed layer is first prepared on a glass substrate by thermal decomposition of zinc acetate. Ag-doped zno nanorods are then assembled on the zno seed layer using the hydrothermal method. The influences of the molar percentage of Ag ions to Zn ions （RAg/zn） on the structural and optical properties of the zno nanorods obtained are carefully studied using X-ray diffractometry, scanning electron microscopy and spectrophotometry. Results indicate that Ag ions enter into the crystal lattice through the substitution of Zn ions. The （002） c-axis-preferred orientation of the zno nanorods decreases as RAg/Zn increases. At RAg/Zn 〉 1.0%, zno nanorods lose their c-axis-preferred orientation and generate Ag precipitates from the zno crystal lattice. The average transmissivity in the visible region first increases and then decreases as RAg/Zn increases. The absorption edge is first blue shifted and then red shifted. The influence of Ag doping on the average head face, and axial dimensions of the zno nanorods may be optimized to improve the average transmissivity at RAg/Zn 〈 1.0%.

关键词： zno nanorods Ag doping thermal decomposition of zinc acetate hydrothermal method

Polymer-capped gold nanoparticles and zno nanorods form binary photocatalyst on cotton fabrics: Catalytic breakdown of dye

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Frontiers of Materials Science 2021年第3期15卷 431-447页

作者： Bharat BARUAH Christopher KELLEY Grace B.DJOKOTO Kelly M.HARTNETT Department of Chemistry and Biochemistry Kennesaw State UniversityKennesawGA 30144-5591USA Division of Natural Sciences Oglethorpe UniversityAtlantaGA 30319USA

This work reports the immobilization of zinc oxide(zno)nanostructures and gold nanoparticles(AuNPs)on cotton fabrics(CFs).The zno and AuNPs containing CF composite materials demonstrated excellent photocatalytic activity towards degradation of the model organic dye molecule.A two-step method was used to first create zinc oxide nanorods(znoNRs)on the CF ***,these znoNRs were decorated with cationic polymer-capped AuNPs to yield the composite materials.A one-pot synthetic route was developed to synthesize polymer-capped *** water-soluble cationic polymers used here are polyguanidino oxanorbornenes(PGONs)at 20 kDa and polyamino oxanorbornenes(PAONs)at 20 ***-vis was utilized to monitor the composite materials’photocatalytic activity in degrading model organic dye *** the materials were characterized by FTIR,UV-visible DRS,SEM,EDX,and *** composite materials exhibited excellent photocatalytic activity and recyclability in the presence of UV light.

关键词： cationic polymer polymer-capped nanoparticles zno nanorods fabric photocatalysis

The Inorganic-organic Hybrid Junction with n-zno nanorods/p-polyfluorene Structure Grown with Low-temperature Aqueous Chemical Growth Method

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Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 296-300页

作者：吴伟边继明 SUN Yinglan CHENG Chuanhui SUN Jingchang LIANG Hongwei LUO Yingmin DU Guotong School of Physics and Optoelectronic Engineering Dalian University of TechnologyDalian 116024China School of Physics and Electronic Technology Liaoning Normal UniverityDalian 116029China

The inorganic-organic hybrid junction was synthesized on ITO glass substrate, which was consisted of an n-type zno nanorods （NRs） grown by low-temperature aqueous chemical growth method and a p-type polyfluorene （PF） organic film fabricated by spin-coating. The experimental results indicate that densely and uniformly distributed zno nanorods are successfully grown on the PF layer. The thickness of the PF layer plays a dominant role for the current-voltage （I-V） characteristic of the zno NRs/PF inorganic-organic hybrid junction device, and a p-n junction with obviously rectifying behavior is achieved with optimal PF layer thickness. The photoluminescence （PL） spectrum covering the broad visible range was obtained from the n-zno nanorods/p-polyfluorene （PF） structure, which was originated from the combination of the PF-related blue emission and the zno-related deep level emission.

关键词： zno nanorods polyfluorene inorganic-organic hybrid junction photoluminescence

CdS nanocrystallites sensitized zno nanorods with plasmon enhanced photoelectrochemical performance

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Chinese Chemical Letters 2019年第12期30卷 2363-2367页

作者： Li Cai Yuanchang Du Xiangjiu Guan Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering (MFPE) Xi’an Jiaotong University (XJTU)

A novel architecture of CdS/zno nanorods with plasmonic silver(Ag) nanoparticles deposited at the interface of zno nanorods and CdS nanocrystallites,was designed as a photoanode for solar hydrogen generation,with photocurrent density achieving 4.7 mA/cm^2 at 1.6 V(***),which is 8 and 1.7 times as high as those of pure zno and CdS/zno nanorod films,***,with optical absorption onset extended to^660 nm,CdS/Ag/zno nanorod film exhibits significantly increased incident photo-tocurrent efficiency(IPCE) in the whole optical absorption region,reaching 23.1% and 9.8% at 400 nm and500 nm,*** PEC enhancement can be attributed to the one-dimensional zno nanorod structure maintained for superior charge transfer,and the extended visible-light absorption of CdS ***,the incorporated plasmonic Ag nanoparticles could further promote the interfacial charge carrier transfer process and enhance the optical absorption ability,due to its excellent plasmon resonance effect.

关键词： zno nanorods Plasmonic Ag nanoparticles CdS nanocrystallites Photoelectrochemical water splitting Synergistic effect