ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhuo Dong,Jiao Men,Jiaduo Wang,Zeyu Zhai,Xiaoying Xie,Jingbo Zhang
Al-doped ZnO (AZO) nanostructure-based compact thin films were successfully prepared via the irradiation of the precursor films containing zinc nitrate and aluminum nitrate under vacuum ultraviolet (VUV) radiation at 172 nm. The VUV irradiation can generate hydroxyl free radicals to make up for the oxygen defects on the as-prepared AZO thin films. Meanwhile, the photoactivation effect triggered by VUV irradiation can desorb the amorphous oxygen species adsorbed on the surface, thus significantly reducing the number of surface defects. By changing the ratio of aluminum nitrate to zinc nitrate, the doped amount of Al can be rationally adjusted for the promotion of electron mobility and conductivity. When the Al loading is 3%, the resultant AZO thin film has the highest electron mobility and conductivity. When used as a base compact layer in CdS/PbS quantum dot-sensitized solar cells (QDSSCs), the nanostructure-based AZO thin film could suppress the recombination of the photogenerated electrons and holes between the TiO2 mesoporous layer and FTO conductive glass. As a result, the assembled QDSSC based on the AZO thin film achieved a photoelectric conversion efficiency of 4.97%, higher than that based on the traditional AZO compact layer prepared by sintering at 450 °C (3.70%). Therefore, VUV irradiation is a promising strategy for the preparation of nanostructure-based compact thin films doped by metal oxides under low temperatures.
研究领域:
材料科学
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能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2015
·Vol. 60
·期 5
·541-548
·
IF 0
Cheng Ke,Wu Yangqing,Meng Jian,Zhao Yaolong,Wang Xiaoyun,Du Zuliang
The noble metal nanoparticles, such as gold, silver and copper, has been widely incorporated into the photoelectronic devices acting as a light-harvesting antenna and enhancing photocurrents through their light scattering or localized surface plasmon resonance effects. Here, this article presented the investigations into the use of gold nanocrystals to realize the plasmon-enhanced photocurrent generation in TiO 2 nanorod-based quantum dots-sensitized solar cells (QDSSCs). By introducing the gold nanocrystals, the short-circuit current density ( J
sc ) of QDSSCs was enhanced more than 10 % from 7.788 to 8.574 mA/cm 2 due to the direct injection of hot electrons from the gold nanocrystals to the photoanode. In order to confirm such conclusion, composite Au/TiO 2 nanostructure was also fabricated. Indeed, the hot electrons injection resulted photocurrent density of ~5 mA/cm 2 was clearly observed under the visible light irradiation.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2017
·Vol. 2017
·期 32
·3787-3793
·
IF 2.444
Qianji Han,Haikuo Zheng,Mingxing Wu
Graphical Highly effective sulfide-sphere counter electrodes are prepared for ZnO nanorod-based quantum-dot-sensitized solar cells. To increase the competitiveness of quantum-dot-sensitized solar cells (QDSCs) among the various photovoltaic devices, it is necessary to develop new counter-electrode (CE) catalysts to replace the unviable Pt CE. Herein, a series of metal-sulfide spheres (e.g., FeS 2 , Co 9 S 8 , NiS, CuS, and ZnS) are designed and synthesized as CE catalysts for QDSCs. As inferred from cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization-curve results, except for ZnS, all of the sulfide spheres perform better than Pt toward S x 2– /S 2– redox-couple regeneration, among which, NiS shows the highest catalytic activity, followed by Co 9 S 8 , CuS, and FeS 2 . The power conversion efficiencies of ZnO nanorod-array photoanode-based QDSCs with sulfide-sphere CEs are 2.5 % (NiS), 2.2 % (Co 9 S 8 ), 1.8 % (CuS), and 0.8 % (FeS 2 ), much higher than that of their Pt CE-based counterparts (0.30 %).
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 7
·2214-2221
·
IF 4.099
Qiang Wu,Juan Hou,Haifeng Zhao,Zhiyong Liu,Xuanyu Yue,Shanglong Peng,Haibin Cao
ZnS as an inorganic passivation agent has been proven to be effective in suppressing charge recombination and enhancing power conversion efficiency (PCE) in quantum dot-sensitized solar cells (QDSCs). In the present study, we constructed a novel TiO2/ZnS/CdS/ZnCdS/CdSe/ZnS photoelectrode via successive ionic layer adsorption and reaction (SILAR) and chemical bath deposition (CBD). The complementary effects of multi-ZnS layers on the optical and electrochemical performance of the QDSCs were systematically investigated. The multi-ZnS can not only facilitate the growth and distribution of QDs, but also suppress the different interface charge recombination effectively. We suggest that the formation of the ZnCdS intermediate layers via ion-exchange route during CBD process contributes to the higher photoelectrochemical cell performance of the QDSCs with the middle ZnS layer. When the three-layer ZnS was employed in CdS/CdSe co-sensitized system, the PCE reached 6.05%, which is much higher than that observed for solar cells with the conventional single ZnS treatments and the two layers inserted at the interface between CdS QDs and CdSe QDs and electrolyte (4.80% and 5.42%, respectively).
研究领域:
材料科学
·
纳米科技
·
光电子学
·
能源化学
·
半导体器件
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Senyang Wang,Yingdi Zhou,Bo Huang,Jingyi Qi,Mengting Hua,Xiaoshi Jin,Ling Li
The practical progression of quantum-dot sensitized solar cells (QDSSCs) due to the poor stability, which directly related to the leakage and volatileness of liquid electrolyte. Herein, the sodium alginate (SA) polysulfide gel electrolyte prepared by grinding method was first applied in the quasi-solid state QDSSCs. It has a pore structure which can elevate the rapid diffusion of ions. And the cross-linked interface with photoanode is smooth and non-adherent. The SA polysulfide gel electrolyte was used in Zn-Cu-In-Se (ZCISe) QDSSCs for standard experiments. The QDSSCs are able to materialize the photoelectric conversion efficiency (PCE) of 8.85 % (V oc is 0.63 V, J sc is 26.16 mA·cm −2 , FF is 51.80), which is 6 % higher than the liquid polysulfide QDSSCs (8.34 %). Above all, the stability is 3.2 times higher than that of liquid polysulfide electrolyte. The research fulfilled the goal of both efficiency and stability, also environmentally friendly.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Qiang Luo,Youchen Gu,Jianbao Li,Ning Wang,Hong Lin
Cobalt-based spinel binary and ternary sulfides (Co 3 S 4 , CuCo 2 S 4 and NiCo 2 S 4 ) are prepared via an economical, facile and versatile synthesis strategy and used as counter electrodes for quantum-dot sensitized solar cells (QDSCs) in conjunction with the aqueous polysulfide electrolyte. The spinel sulfides exhibit superior catalytic activities toward the polysulfide electrolyte reduction than that of the Cu 2 S. Both electrochemical impedance spectroscopic and Tafel polarization measurements imply that the incorporation of Cu or Ni cation into the spinel lattices induces a significantly faster electrocatalytic rate towards the polysulfide reduction than that of the binary Co 3 S 4 . Using ternary NiCo 2 S 4 as counter electrode, the QDSC achieves a power conversion efficiency of 3.3%; which is increased by 26% compared with the QDSC fabricated with binary Co 3 S 4 counter electrode (2.61%). The excellent electrochemical performance of the ternary cobalt spinel sulfides suggests their promising application as counter electrodes for efficient QDSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS-CONDENSED MATTER
·
2022
·Vol. 34
·期 25
·255001
·
IF 2.745
Baomei Wang,Xingna Liu,Zhen Liu,Zinan Ma,Zhongwei Li,Bingrui Wang,Xiao Dong,Yongyong Wang,Xiaohui Song
In this work, copper selenide (Cu2−xSe) thin films were grown on FTO conductive glass substrates using a facile microwave-assisted hydrothermal method. The effects of synthesis parameters such as precursor components and deposition time on the stoichiometry and morphology of the synthesized films were systematically investigated through different techniques including XRD, SEM, and AFM. In order to evaluate the electrochemical catalytic performance of the synthesized copper selenide in electrolyte containing the sulfide/polysulfide redox couple, we assembled liquid-junction quantum dots-sensitized solar cells (QDSSC) using the synthesized copper selenide thin films as counter electrodes and CdSe quantum dots-sensitized mesoporous TiO2 as photoanodes. Under the illumination of one Sun (100 mW cm−2), the QDSSC assembled with the optimal copper selenide CEs (Cu:Se = 1:1) exhibited a power conversion efficiency of 2.07%, which is much higher than that of traditional Pt counter electrode (0.76%).
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Huiyun Wei,Guoshuai Wang,Yanhong Luo,Dongmei Li,Qingbo Meng
Colloidal QDs, typically, alloyed QDs with extending light absorption range, exhibit prospective application on quantum dot-sensitized solar cells (QDSCs). In this work, CdSe 0.8 Te 0.2 alloyed QDs have been employed to assemble QDSCs, and the influence of the photoanode structure and film thickness on the cell performance has been investigated in detail. Further study on the charge transport and interfacial electron transfer processes reveals that with the film thickness increasing, recombination possibility will be remarkably enhanced. By careful control on the balance between the light absorption and carrier recombination, an optimal double-layer photoanode structure with 11.5 μm-thickness transparent and 6 μm-thickness scattering layers can present a power conversion efficiency of 7.55%, which is one of the best records for the sandwiched-type QDSCs.
研究领域:
材料科学
·
光伏技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Guojiao Zhao,Yefeng Wang,Jing-Hui Zeng,Zhaofu Fei,Paul J. Dyson
Cost-effective solid-state electrolytes with improved conductivity and device performances have received much research interest in (photo)electrochemical cells, including solar cells, secondary batteries, and so on. In this work, a series of organic ionic crystals (OICs) containing imidazolium salts modified with bulky fluorenyl and diphenylmethyl substituents and BF4 anions were synthesized and applied into quantum dot-sensitized solar cells (QDSSCs) as the matrix of solid-state electrolytes. The performance of QDSSCs employing these new OICs was evaluated by electrochemical impedance spectroscopy, Tafel plots, and incident monochromatic photon–electron conversion efficiency traces. A champion device applying imidazolium salts with nonplanar diphenylmethyl substituents and BF4 anions afforded a highest power conversion efficiency of 5.69% under AM 1.5 (100 mW·cm–2) irradiation.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
·
2024
·
IF 4.6
Huu Phuc Dang,Ha Thanh Tung,Nguyen Thi My Hanh,Nguyen Thuy Kieu Duyen,Vo Thi Ngoc Thuy,Nguyen Thi Hong Anh,Hieu Van Le
This study developed a novel PbS-rGO composite counter electrode to enhance the performance of quantum dot-sensitized solar cells (QDSSCs). The composite was synthesized via a hydrothermal method by anchoring PbS nanocubes onto reduced graphene oxide (rGO) sheets. The effect of mass ratios of rGO to PbS (0.0, 0.1, 0.3, and 0.6) to a power conversion efficiency (PCE) was investigated. The optimized rGO-PbS (0.03) composite achieved a power conversion efficiency of 5.358%, Voc of 0.540 V, Jsc of 21.157 mA/cm², and FF of 0.516. The rGO framework provides an interconnected conductive network that facilitates efficient charge transport, reduces the charge transfer resistance, and improves the overall conductivity. Electrochemical analyses confirmed the superior electrocatalytic activity of the composite in reducing the Sn²⁻/S²⁻ redox couple. The unique band alignment between rGO and PbS optimized the electron transfer pathways. The hierarchical structure increased the surface area and light absorption, enabling a more effective charge transfer at the electrode-electrolyte interface.
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Ruifeng Li,Chunfeng Cai,Lian Hu,Huizhen Wu,Wenhua Zhang,Junfa Zhu
Band alignments of ZnO/CdSe nanocrystal quantum-dots (NQDs) heterojunctions are determined by ultraviolet photoelectron spectroscopy using synchrotron radiation source. To obtain ideal heterojunction interface, 1,2-ethanedithiol was used for CdSe NQDs as a ligand substitute. A type II band alignment of the ZnO/CdSe NQDs heterojunctions with changeable band offsets by varying the sizes of CdSe NQDs is concluded. The tunable band alignment of ZnO/CdSe NQDs heterojunctions is beneficial to the improvement of the design and fabrication of quantum-dot-sensitized solar cells.
研究领域:
材料科学
·
光电子学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）