SOLAR ENERGY
·
2021
·
IF 5.742
Jixi Wang,Yangbiao Liu,Xiudi Xiao,Zhuoneng Bi,Yuan Lu,Guizhang Sheng,Xuesong Cai,Yanqing Zhu,Xueqing Xu,Gang Xu
All inorganic perovskite solar cells (PSCs) have been demonstrated to get tremendous interest recently owing to their better thermal stability. Nevertheless, some CsPbI 2 Br films prepared at low temperature have lower quality compared to those annealing at high temperature. Herein, to obtain high performance PSCs, a simple post-treatment strategy is presented by spin coating acetylacetone (AA) solution on the CsPbI 2 Br films. The AA treatment can reduce the density traps on the CsPbI 2 Br films surface and enlarge the size of grains, resulting in enhanced performance PSCs. After optimizing surface treatment, the devices based on low-temperature-processed CsPbI 2 Br with AA treatment achieved a power conversion efficiency (PCE) of 14.43%. The better CsPbI 2 Br films quality and interface contact of hole transport layer (HTL)/CsPbI 2 Br result in better device stability. Therefore, it could be a promising post treatment method for enhancing the performance of PSCs by introducing AA on the perovskite surface.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 18
·185402
·
IF 3.874
Bingquan Han,Lei Zhang,Yuwei Cao,Benyi Li,Zhiyuan Liu,Lingbo Xu,Peng Wang,Ping Lin,Xiaoping Wu,Can Cui
CsPbI3 inorganic perovskites with ideal bandgap and much enhanced thermal stability compared with organic−inorganic hybrid perovskites, have attracted much interest in the field of solar cells. The performances of solar cells highly depend on the quality of perovskite films, yet the research on fabrication methods of inorganic perovskites is far below that of organic–inorganic hybrid counterparts. Antisolvent engineering is a widely used method in controlling the morphology and crystallinity of organic–inorganic hybrid perovskites. Its effect varies with parameters such as the physicochemical properties of antisolvents and the compositions of perovskite precursors. Specially, there lacks a comprehensive study comparing different antisolvents used in low-temperature processed CsPbI3 from dimethylammonium-based precursors. In this work, we used three different antisolvents to control the growth of CsPbI3 films in a low-temperature (<200 °C) processed procedure and systematically compared the properties of resultant films. The green antisolvent ethyl acetate (EA) engineered CsPbI3 films exhibit improved morphology and crystallinity as well as reduced defects, compared with the counterparts processed without antisolvent or those with widely employed toxic antisolvents toluene and chlorobenzene. The EA antisolvent engineering results in efficient CsPbI3 perovskite solar cells with a champion power conversion efficiency of 8.8%. Our work thus provides a green and viable way to prepare high quality CsPbI3 perovskite films for optoelectronic applications.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Bowen Ding,Xiao Zhao,Shimao Wang,Xueyan Shan,Zhe Chen,Zanhong Deng,Ruhua Tao,Jingzhen Shao,Gang Meng,Xiaodong Fang
Alkali metal bis(trifluoromethanesulfonyl)imide (TFSI) modification of TiO 2 electron transport layer (ETL) has been widely adopted to improve the performance of perovskite solar cells (PSCs), however, only a handful of investigations have proposed some corresponding mechanisms, and more in-depth investigations are urgent. In this investigation, Li-TFSI and K-TFSI were adopted to modify mesoporous TiO 2 (me-TiO 2 ) ETL of PSCs, electrochemical impedance spectroscopy , photoluminescence spectrum, space-charge limited current, and X-ray photoelectron spectroscopy measurements were performed to investigate the modification mechanisms. Alkali metal-TFSI modification could passivate the oxygen vacancies in me-TiO 2 ETL and suppress the charge recombination effectively, improve the contact between me-TiO 2 ETL and perovskite layer and increase the conductivity of me-TiO 2 ETL which lead to rapid charge extraction and transfer at ETL/perovskite interface and balance the electron flux and hole flux in devices. Moreover, sulfates induced by alkali metal-TFSI act as nucleation sites in the crystallization process of perovskite which could increase the grain size and improve the uniformity of CH 3 NH 3 PbI 3 films obviously, and it is a positive factor for suppressing charge recombination and improving the cell performance. As a result, the power conversion efficiencies of the champion devices for Li-TFSI and K-TFSI modified PSCs have reached 20.02% and 19.64%, respectively.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 46
·2005413
·
IF 16.836
Jiangdong Gong,Haiyang Yu,Xin Zhou,Huanhuan Wei,Mingxue Ma,Hong Han,Shuo Zhang,Yao Ni,Yuelong Li,Wentao Xu
Polycrystalline organometal halide perovskite films have been recently exploited as the active layer in artificial synapses, demonstrating the basic functional emulation of biological synapses. However, for the implementation of neuromorphic computing and bioinspired intelligent systems, full synapse-like functionality with a simple structure and extremely low energy consumption are of crucial importance. Here, a modified thickness-confined surfactant-assistant self-assembly strategy is proposed to synthesize CH 3 NH 3 PbBr 3 single-crystalline thin platelets (SCTPs) and a two-terminal lateral-structured synaptic device with ultralow operating current down to sub-pA is fabricated. Essential synaptic behaviors are realized, including paired-pulse facilitation, spike-dependent plasticity, transition from sensory memory to short-term memory and potentiation/depression. Furthermore, the activity-dependent plasticity is also demonstrated on the SCTP-based artificial synapse, which may enable nociceptors to detect intense external harm. These results provide a new protocol for designing lateral-structured synaptic devices based on hybrid perovskite SCTPs and future neuromorphic bioelectronics.
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高影响因子
JOURNAL OF POWER SOURCES
·
2020
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IF 8.247
Pengfei Wang,Wanhong Lü,Mingyue Wang,Lili Yang,Fengyou Wang,Huilian Liu,Maobin Wei,Jinghai Yang,Lin Fan
We use a two-step spin-coating method to construct efficient and non-hysteresis planar perovskite solar cells (PSCs). The influence of solvent environment on the precursor configuration, perovskite crystallization kinetics , and photoelectric properties of the PSCs are systematically studied, resulting in novel insights into the function of dimethyl sulfoxide/dimethylformamide (DMSO/DMF) blend solvent (BS). The DMSO/DMF BS promotes the construction of porous “rod-like” precursor film, which provides sufficient space for lattice expansion and orientation selection during perovskite growth, thus producing high-quality perovskite absorbers with high crystallinity . Moreover, DMSO/DMF BS also induces the formation of amorphous lead chloride (PbCl 2 ) and stores it in the final perovskite film, effectively passivating perovskite defects, extending carrier lifetime, and significantly improving device performance. As a result, a DMSO/DMF-based planar PSC is prepared with reverse efficiency of 19.69% and forward efficiency of 19.54%. Moreover, devices show a good stability over 500 h and reproducibility in 20 pieces fabricated with the same procedure. This study provides a new concept for the preparation of high-quality perovskite absorbers and highly efficient planar PSCs, and represents an important contribution toward determining the potential influence of solvent engineering on perovskite crystallization kinetics.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 37
·12865-12875
·
IF 7.059
Pan Shu,Xiaofei Cao,Yongqiang Du,Jiankui Zhou,Jianjun Zhou,Shengang Xu,Yingliang Liu,Shaokui Cao
The fiber-shaped resistive random access memory (RRAM) is an important subject for flexible wearable electronic textiles. The investigation of the resistive switching (RS) performance of the materials in the basic storage unit (crosspoint) of a flexible fibrous crossbar is very significant for realizing flexible wearable memories. In this work, fibrous crosspoint RRAM devices, abbreviated as FCPe-RRAMs, have been fabricated on the basis of organic–inorganic halide perovskite MAPbI3. Herein, a functional Al@MAPbI3 fiber is first prepared via a simple dip-coating method, in which the low-temperature solution processing method and cheap raw materials are conducive to the future large-scale and low-cost production. By optimizing the preparation conditions for MAPbI3, a pinhole-free, compact and uniform perovskite film is deposited on the bare Al fiber. Then, the FCPe-RRAM devices with a configuration of Al@MAPbI3/Al are assembled on a homemade holder by perpendicularly crossing the bare Al fiber and the functional Al@MAPbI3 fiber at a certain bending angle. The FCPe-RRAM devices exhibit a bipolar RS behaviour. The highest ON/OFF ratio reaches up to approximately 106 in the FCPe-RRAM devices, together with a low SET/RESET voltage (+1.66 V/−0.47 V) and a long retention time (>104 s). The FCPe-RRAM devices also exhibit excellent reproducibility and operational uniformity, which are important for practical applications in mass production. The investigation of the RS mechanism suggested that the FCPe-RRAM devices follow the mechanism of conductive metallic filament formation by the generated electrons with the help of thermionic emission. This work reveals the potential promising applications of FCPe-RRAM devices in flexible wearable memories with high storage density.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Cong Geng,Yahong Xie,Peng Wei,Haichao Liu,Yue Qiang,Yi Zhang
Hole transporting material (HTM)-free carbon-based perovskite solar cells (C-PSCs) have been regarded as one of the most promising solar cell systems owing to their superior long-term stability and low cost. However, using commercial conductive carbon (CC) paste to prepare carbon electrode (CE) usually leads to a large number of defects at the perovskite/CE interface, often resulting in a low fill factor (FF) and poor photoelectric conversion efficiency (PCE). In this paper, by pyrolyzing ZIF-67 and etching with HCl, the Co-NC(HCl) composite with a large specific surface area are prepared. Combining this material with CC paste in different proportions, a series of HTM-free PSCs structured as FTO/SnO 2 /perovskite/CE are fabricated. Our experimental results demonstrate that the incorporation of Co-NC(HCl) composite efficiently improves interface performance of perovskite/CE, suppresses charge recombination and promotes hole extraction, consequently enhancing the photovoltaic performance of the C-PSC. In particular, the maximum PCE of 10.72% has been achieved in the ambient atmosphere, achieving 43% increasing over the pure CC-based device. The improved performance can be attributed to the significant effect of morphological structure of Co-NC(HCl) composite and the synergistic effect of Co-N co-doping on the performance of C-PSCs.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Ping Xu,Yueqi Yu,Ting Li,Huan Chen,Qi Wang,Meng Wang,Mimi Wan,Chun Mao
It is of great significance to develop micro/nanomotors with good biosafety and high efficiency for biomedical detection. In order to enhance the contact chances between the biosensors and the analytes in the complex blood sample, we report a near-infrared light (NIR)-driven fluorescent nanomotor, which can safely and efficiently capture and detect circulating tumor cells (CTCs) in the whole blood environment without pretreating procedures. Firstly, the structure of the fluorescent nanomotor was characterized and its motion behavior in different environments was analyzed. Subsequently, CTCs detection conditions were optimized to explore the effect of nanoscale autonomous mixing provided by nanomotor’s motion behavior on the efficiency of CTCs capture. The results showed that the NIR-driven fluorescent nanomotor can keep moving in the complex biological medium so as to increase their contact chances with CTCs and improve the binding efficiency with the target analyte (the capture efficiency increased from 67.5% – 85% (no NIR irradiation) to 93.75–98.75% (under NIR irradiation)). Finally, due to the excellent fluorescence properties of the nanomotors, they can be applied to the visual detection of the whole blood samples obtained from clinical cancer patients. The NIR-driven nanomotor designed in this paper can detect CTCs in whole blood environment, which is a beneficial extension of the existing cell detection system of most micro/nanomotors in water phase environment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Xiaofang Ye
In recent years, flexible perovskite solar cells have received extensive attention and rapid development due to their advantages of lightweight, portability, wearability and applications in near-space. However, due to the limitations of their preparation process and other factors, high-efficiency and large-area flexible perovskite solar cells still have a lot of room for development. In our work, a flexible perovskite solar cell (PEN/ITO/SnO 2 /KCl/Cs 0.05 (MA 0.17 FA 0.83 ) 0.95 Pb(I 0.83 Br 0.17 ) 3 /spiro/Au) was prepared using a low temperature (no higher than 100 °C) solution process, and the device with the highest efficiency of 16.16% was obtained by adjusting the concentration of the KCl modified layer. Meanwhile, the efficiency of the large area (1 cm 2 ) flexible solar cell was higher than 13%. At the same time, the passivation of the KCl interface modification layer inhibits the formation of the defect states, which reduced the surface recombination of the perovskite and improved the carrier transport performance, and the hysteresis effect of the device was also reduced accordingly.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Zhixu Chen,Qi Li,Taicheng Yang,Yaofeng Zhang,Minhong He,Huiyun Zeng,Xiaoman Mai,Yingtao Liu,Huajun Fan
A simple, green and efficient method for extraction, purification and enrichment of pesticide residues of triazoles and pyrethroids in Longan fruit was developed by ultrasonic-assisted aqueous two-phase extraction (UAATPE) coupled to vortex-assisted dispersive liquid-liquid microextraction (VADLLME). Using an aqueous two-phase system (ATPS) of ethanol/K 2 HPO 4 as extraction solvent, the composition of the ATPS, extraction temperature and time were investigated, respectively. Then VADLLME process also was optimized by investigating type and volume of extracting and dispersive solvents, vortex-assisted time and salt addition. The optimum conditions were as follows: the ATPS composition of ethanol concentration 30.0% (w/w) and K 2 HPO 4 concentration 25% (w/w), extraction temperature 70 °C and extraction time 15 min for UAATPE; 1-dodecanol 200 μL as extraction solvent, ethanol 1.25 mL as dispersive solvent, vortex-assisted time 1.5 min and addition of NaCl 4% (w/v) for VADLLME. Ethanol as extraction solvent and dispersive solvent could directly connect UAATPE with VADLLME without extra steps. By means of HPLC-DAD detection, nine pesticides had good linearity ranged from 0.0200 to 13.59 μg/mL (R 2 ≥ 0.9957). LODs and LOQs were in the range of 0.005576−0.01740 μg/mL and 0.01859−0.05010 μg/mL, respectively. UAATPE-VADLLME coupled to HPLC was successfully applied to simultaneous determination of multiple pesticides in Longan fruit, and mean recoveries and RSDs were between 76.95% and 98.63%, 1.2% and 9.8%, respectively. Furthermore, myclobutanil, fenpropathrin and deltamethrin were detected in pericarp and pulp of Longan samples from different districts, respectively.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yinming Fan,Guolong Zeng,Xiaoguo Ma
This work systematically investigated the effects of prepolymerization on the property of multi-templates surface molecularly imprinted polymer (MIP), which was utilized to quickly and simultaneously separate and detect six sulfonamides (sulfadiazine, sulfathiazole , sulfamerazine , sulfamethazine , sulfamethoxazole and sulfadoxine) in real waters. The MIPs were prepared using the six sulfonamides as the templates, mesoporous silica supported onto the surface of magnetic graphene oxide as the carrier and 4-vinylbenzoic as the functional monomer , with and without prepolymerization of templates with functional monomer. The preparation and adsorption conditions were optimized. It was found that the adsorption capacities of the selected six sulfonamides on the MIP (pre) prepared with prepolymerization were apparently higher than those on the MIP (no pre) synthesized without prepolymerization. Subsequently, the MIPs were utilized as adsorbents for SPE of these sulfonamides, and coupled with high performance liquid chromatography (HPLC) for the determination of sulfonamides. The developed analytical method showed outstanding applicability for the detection of trace sulfonamides in real water samples. The spiked recoveries and relative standard deviations (RSDs) of the six sulfonamides using MIP (no pre) and MIP (pre) were 73.34–99.43% and 87.37–102.34%, 2.28–7.77% and 3.18–6.49%, respectively.
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PubMed
高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Yue Qiang,Yahong Xie,Ying Qi,Peng Wei,Haokun Shi,Cong Geng,Haichao Liu
SnO 2 (Tin oxide) is one of the most successful electron transport layer (ETL) materials in perovskite solar cells (PSCs) because of its low sintering temperature and simple preparation process. Similarly, carbon-based hole transport material-free PSCs (C-PSCs) have been widely studied because of their excellent stability and low price. Therefore, C-PSCs having SnO 2 as ETL can be envisaged as a promising PSCs system for commercial flexible equipment. However, studies on this system are still scarce because of its low power conversion efficiency (PCE). In this paper, the electron lifetime and current (J sc ) of a PSC containing a Li-SnO 2 /Al 2 O 3 + CH 3 NH 3 PbI 3 /carbon structure are greatly improved by doping lithium into SnO 2 (Li-SnO 2 ) and sandwiching an Al 2 O 3 interlayer into the Li-SnO 2 ETL and CH 3 NH 3 PbI 3 . A PCE of 10.01% is obtained, which is 42.3% higher than a PSC having a SnO 2 /CH 3 NH 3 PbI 3 /carbon structure. The entire preparation process is very simple and is carried out in an air atmosphere below 200 °C (20–40% humidity).
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高影响因子
危险品化学品经营许可证（带存储）