BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Hongwu Zhu,Xiaoguang Lin,Yong Su,Hua Dong,Jianhua Wu
Dielectrophoresis (DEP), the induced motion of polarizable particles in a non-uniform electric field, has been proven as a perfect candidate to transport, accumulate, separate and characterize micro-/nano-scale bioparticles in microfluidic systems. However, conventional fabrication technologies are complex, time-consuming and relatively expensive, leading to low throughput of the DEP-based systems. In this paper, we report a novel microfluidic alternating current DEP (AC-DEP) chip fabricated via inexpensive screen printing method. The innovation of our work consists in the extreme simplicity of the fabrication procedure, i.e., the main components, including electrodes and channels, were constructed by layer-by-layer screen printing process , which is especially suitable for high-throughput mass production. Carbon paste, instead of metals, was used to print interdigitated electrodes with semi-3D structure which not only reduces dramatically the chip cost but also increases particle trapping efficiency. To test the chip performance, yeast cells, as model cells, were trapped and separated from a mixed suspension with PS microspheres . Our results show that high capture rate and separation efficiency can be achieved under optimized conditions.
研究领域:
生物工程
·
微纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Teng Liao,Aodong Zhu,Yuanzhu Jiang,Wang Zhao,Mengmeng Cheng,Junyan Xiao,Yi-Bing Cheng
Carbon-based top electrodes have significant value in enhancing the stability and reducing the cost of perovskite solar cells (PSCs). However, the fabrication process for carbon-based top electrodes in large-area, high-performance perovskite solar modules (PSMs) still lacks practical techniques. In this work, we reference the bag moulding process and use a plasticine-like uncured carbon paste to prepare the top electrode for small-area PSCs and PSMs. Benefiting from the uniform pressure provided by the bag pressing process, this carbon electrode can make sufficiently good electrical contact with the hole transport layer in the large-area device in a single pass. After further removing excess fluid, the device can achieve efficiencies of 18.57 % (∼0.15 cm 2 ) and 14.44 % (∼10 cm 2 ) with good stability. This convenient top electrode preparation method at room temperature offers a novel technological solution for the commercial application of large-area PSMs.
研究领域:
材料科学
·
可再生能源
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Liquan Yao,Limei Lin,Hui Liu,Fengying Wu,Jianmin Li,Shuiyuan Chen,Zhigao Huang,Guilin Chen
Antimony chalcogenide Sb 2 (S, Se) 3 is attracting a lot of attention as photovoltaic absorber owing to its rewarding photoelectric properties, low toxicity, and earth abundance. However, its device efficiency is still limited by the absorber material quality and device interface recombination. In this work, a fluorine-doped tin oxide (FTO) substrate with ultra-thin SnO 2 layer and a low-cost stabilized carbon paste are introduced as a front and back contact layer respectively in Sb 2 (S, Se) 3 based planar solar cells. Over 5.2 % efficiency is demonstrated in the structure of FTO/SnO 2 /CdS/Sb 2 (S, Se) 3 /Carbon/Ag, where the Sb 2 (S, Se) 3 is prepared by hydrothermal technique. The complementary device physics characterizations reveal that the interfacial recombination between TCO and CdS is significantly suppressed by the introduction of ultra-thin SnO 2 layer, which is profited from the leakage protection and bandgap offset engineering by its high resistivity and suitable conduction band minimum. Meanwhile, the successful adoption of the low-cost stabilized carbon as a back contact here shows an enormous potential to replace the conventional organic hole transport materials and noble metal. We hope this work can provide positive guidance to optimize Sb 2 (S, Se) 3 based planar solar cells in the future.
研究领域:
材料科学
·
光伏技术
·
可再生能源
✓ 已验证
DOI
高影响因子
Solar RRL
·
2020
·Vol. 4
·期 11
·2000431
·
IF 7.527
Pengfei Xie,Guizhi Zhang,Zechao Yang,Zhenxiao Pan,Yueping Fang,Huashang Rao,Xinhua Zhong
Carbon electrodes are a promising alternative to metal electrodes in the access of high-stable and low-cost perovskite solar cells (PSCs). However, polar components (including cyclohexanone, terpineol, etc.) in commercial carbon pastes for carbon electrodes usually corrode perovskite materials, thereby deteriorating the photovoltaic performance of the resulting solar cells. Therefore, the development of perovskite-compatible carbon pastes and carbon electrodes is of great significance in obtaining high-performance carbon-based PSCs. Herein, carbon pastes based on low polar alkane solvents are developed for perovskite-compatible carbon electrode (PCCE) in the construction of carbon-based CsPbI 2 Br PSCs. The optimized cells based on PCCE offer a champion efficiency of 13.16% ( J SC = 14.33 mA cm −2 , V OC = 1.22 V, and fill factor (FF) = 0.75), which is remarkably higher than that of commercial carbon paste-derived counterparts (11.51%). Even without encapsulation, CsPbI 2 Br PSCs based on PCCE maintain over 93% of their initial efficiency in an air atmosphere with a humidity of 30–40% for over 1000 h.
研究领域:
材料科学
·
能源技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6716
·
IF 3.623
Shiyu Ma,Yan Lu,Bo Wang,Jinkai Li
White LEDs were encapsulated using Cs4PbBr6quantum dots and Gd2O3:Eu red phosphor as lamp powder. Under the excitation of a GaN chip, the color coordinates of the W-LED were (0.33, 0.34), and the color temperature was 5752 K, which is close to the color coordinate and color temperature range of standard sunlight. The electric current stability was excellent with an increase in the electric current, voltage, and luminescence intensity of the quantum dots and phosphors by more than 10 times. However, the stability of the quantum dots was slightly insufficient over long working periods. The photocatalytic devices were constructed using TiO2, CsPbBr3, and NiO as an electron transport layer, light absorption layer, and catalyst, respectively. The Cs–Pb–Br-based perovskite quantum dot photocatalytic devices were constructed using a two-step spin coating method, one-step spin coating method, and full PLD technology. In order to improve the water stability of the device, a hydrophobic carbon paste and carbon film were selected as the hole transport layer. The TiO2layer and perovskite layer with different thicknesses and film forming qualities were obtained by changing the spin coating speed. The influence of the spin coating speed on the device’s performance was explored through SEM and a J–V curve to find the best spin coating process. The device constructed by the two-step spin coating method had a higher current density but no obvious increase in the current density under light, while the other two methods could obtain a more obvious light response, but the current density was very low.
研究领域:
材料科学
·
光电
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）