JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yue Qiang,Jian Cheng,Ying Qi,Haokun Shi,Haichao Liu,Cong Geng,Yahong Xie
In order to meet the demand for fabricating flexible and wearable solar cell products, low-temperature preparation technology of perovskite solar cells (PSCs) has become critical. As a highly promising electron transport layer (ETL) material, SnO 2 has many advantages, such as high charge mobility, wide band gap, and could be prepared at relatively low temperatures. However, the application of SnO 2 -based PSCs is limited by the expensive hole transport material (HTM) and electrode material (e.g. spiro-OMeTAD and gold) in the common device structure. In this paper, with SnO 2 as the ETL, cheap carbon as the counter electrode, HTM–free PSCs structured as FTO/SnO 2 /CH 3 NH 3 PbI 3 /Carbon was fabricated by the full low-temperature technology. The thickness of the SnO 2 ETL was optimized by adjusting the concentration of the SnO 2 precursor. The highest PCE of 8.32% was obtained and after 32 days in an air environment without packaging, the PCE still remained approximately 92% of its original performance. The factors affecting the stability of the cell were analyzed according to the structure of the PSCs.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Mingguang Li,Jing Li,Jun Wang,Longsheng Yu,Tingting Wang,Jibiao Jin,Ligang Xu,Chao Zheng,Runfeng Chen,Wei Huang
The modification of the interfacial contacts between the active layer and the electrode is of great importance in achieving high-performance organic solar cells (OSCs). Herein, a composite film with gradient diffusion structure based on zinc oxide (ZnO) and nonfullerene organic semiconductor of ITIC (G-ZnO/ITIC) is constructed by a convenient one-step solution-processing method for the interfacial modification of OSCs. The facilely constructed G-ZnO/ITIC composite films show enhanced surface hydrophobicity and comparatively smooth morphology, contributing to the improved interfacial contact between the inorganic interfacial layer and organic photoactive layer. Meanwhile, the cascade energy level established inside the bulk G-ZnO/ITIC cathode interfacial layer (CIL) would further assist in the electron-transporting process for efficient charge extraction. Therefore, G-ZnO/ITIC-based PTB7-Th:PC71BM OSCs exhibit power conversion efficiency (PCE) up to 8.73%, which is remarkably larger than these of conventional ZnO-based devices (7.88% for pure ZnO CIL device, 7.27% for ZnO/ITIC bilayer CIL device, and 6.93% for ZnO/ITIC blends CIL device). This gradient diffusion structure is also effective in the PTB7-Th:ITIC-based nonfullerene OSCs, showing improved PCE values from 6.63% to 7.29%. The facilely prepared ZnO/organic semiconductor composite films with gradient diffusion structures and improved device performance would significantly broaden the types of interfacial layers with minimized boundaries among various functional layers, representing an important concept advance in constructing high-performance CILs for OSCs.
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高影响因子
ACS Applied Energy Materials
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2019
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IF 0
Zhixin Zhang,Xinshu Luo,Bin Wang,Jingbo Zhang
To improve electron transport rate of perovskite solar cells, a ZIF-8-derived porous carbon skeleton layer is prepared by carbonizing the ZIF-8 thin film on conducting glass as the electron transport skeleton of a perovskite solar cell. Polyvinylpyrrolidone is added during the synthesis of ZIF-8 to reduce the particle size of ZIF-8 and decrease the carbonization temperature below 600 °C. The porous structure of ZIF-8 is mainly reserved at the optimized carbonization temperature. Then, TiO2 nanoparticles are deposited on the surface of a porous carbon skeleton to form an electron transport layer of a perovskite solar cell with the structure of FTO/ZIF-8-derived porous carbon layer/TiO2/perovskite/spiro-OMeTAD/Au. Because of the good conductivity of the ZIF-8-derived porous carbon skeleton, the photogenerated electron transport rate of the perovskite solar cell is increased. At the same time, the porous structure of the ZIF-8-derived carbon layer increases the contact area between the perovskite layer and the TiO2 layer to favor separation of photogenerated charges. Therefore, the light-to-electric conversion efficiency of the CH3NH3PbI3 perovskite solar cell is enhanced from 14.25% to 17.32%.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Zhixin Zhang,Xinshu Luo,Jie Ding,Jingbo Zhang
Methylamine lead iodide (CH 3 NH 3 PbI 3 ) perovskite thin film solar cell has attracted much attention due to its low cost and high photoelectric conversion efficiency. Preparation of high quality perovskite thin film is the key to obtain high conversion efficiency of solar cells. Here, the pinhole-free CH 3 NH 3 PbI 3 layer with high coverage and smooth surface is prepared by the one-step solution method in air with ethylacetate as anti-solvent on an electron transport hybrid layer of TiO 2 nanoparticles coated porous carbon . The effect of ethylacetate as anti-solvent on the quality of perovskite thin film is studied in detail by comparing with chlorobenzene and ethylether. The high saturation and humidity resistance of ethylacetate in air control the nucleation and growing kinetics of perovskite crystals during the spin coating process, which facilitates the formation of uniform pinhole-free perovskite thin films. The perovskite solar cell based on the prepared high quality thin film achieves the highest conversion efficiency of 17.41% in ambient air with a relative humidity of 35%, which is superior to the perovskite thin films prepared with chlorobenzene and ethylether (conversion efficiency of 10.80% and 10.20%). The higher light-to-electric conversion efficiency is due to high coverage of the pinhole-free perovskite thin film and good contact with the electron transport layer and the hole transport layer.
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高影响因子
JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Jian Cheng,Yue Qiang,Cui Zhou,Haokun Shi,Haichao Liu,Cong Geng,Yahong Xie
Commercial carbon-based perovskite solar cells have rapidly developed due to its low cost and long-term stability. However, commercial carbon paste as counter electrode always produces a large number of defects at the perovskite interface, thereby greatly affecting the performance of the perovskite solar cells . In this work, a grinding process is used to compact the thin carbon film . The process effectively eliminates defects and improves the extraction efficiency of holes from the photoexcited layer, resulting in 21.2% increase in the efficiency of the carbon-based perovskite solar cells. In addition, open-circuit voltage decay on the order of tens of seconds is analyzed in detail. A new capacitor-like model is established to successfully explain the hysteresis phenomenon . Perovskite solar cells show 700 h of stability with ground carbon counter electrode.
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高影响因子
ACS Applied Energy Materials
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2019
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IF 0
Ya Xu,Jianyong Feng,Tao Yu,Jiawei Li,Xiaopeng Han,Huiting Huang,Zhaosheng Li,Zhigang Zou
It is important to change the semiconducting behaviors of CH3NH3PbI3 (MAPbI3) perovskites to meet the needs for different applications, which requires efficient strategies for Fermi level tuning in MAPbI3. Previous studies reported that the Fermi level of MAPbI3 could be down-shifted when exposed to I2 vapor; such a down-shift of the Fermi level could be rationalized by the filling of iodine vacancies (VI’s), a donor-type defect in MAPbI3. However, it is difficult to control the amount of incorporated I2 into the MAPbI3 matrix; meanwhile, MAPbI3 degradation may also occur following I2 vapor exposure. Herein, we propose a controllable and facile method for iodine manipulation and Fermi level tuning of MAPbI3, in which molecular iodine dissolved in antisolvent is applied as the iodine source. After iodine manipulation, the best-performing MAPbI3 solar cell exhibits a power conversion efficiency of 17.7%, in contrast to 15.8% on the pristine MAPbI3. Steady-state and time-resolved photoluminescence measurements indicate that iodine-modified MAPbI3 possesses reduced defect density and enhanced charge-carrier lifetimes. Photoelectron spectroscopy analyses reveal a 120 meV down-shift of the Fermi level in iodine-modified MAPbI3, as compared to the control MAPbI3.
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APPLIED CLAY SCIENCE
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2019
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IF 3.89
Peng Zhang,Jian Wang,Yu Jia,Wenqing Li,Xiaoling Tan,Dan Zhang,Shaonan Xu,Peiping Zhang,Cundi Wei,Shiding Miao
The Co-based spinel nanocrystals were fabricated by thermal decomposition of clay cages comprised with Laponite (LP) that were assembled on ZIF-67 frameworks (LP@ZIF-67). Spinel phases included Co 3 O 4 , FeCo 2 O 4 and MgCo 2 O 4 were produced and encapsulated within the Laponite cages (LP@spinel). The prepared materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analyses (TGA). It was indicated that the porous structure of Laponite and ZIF-67 was preserved after annealing at the temperature of ~400 °C. The XPS showed the binding energy of Co 2P in sample of LP@spinel shifted to lower values compared to the Co 3 O 4 which was obtained by annealing the pure phase of ZIF-67, and this demonstrates the catalytically active Co-centers were (220) facet-exposed in spinel nanocrystals. The material LP@spinel shares mesoporous structure with surface area of 135 m 2 ·g − 1 . The LP@spinel was found to exhibit brilliant performance on aerobic oxidation of cyclohexane to get cyclohexanone and cyclohexanol (KA oil). At a preset O 2 pressure of 2.0 MPa, the catalysis showed an outstanding conversion at 17.2% and the selectivity was found to reach 95.3% of KA oil for a typical reaction t = 5.0 h at T = 150 °C.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Lihui Zhang,Qiwen Wang,Yu Qi,Ling Li,Shengtian Wang,Xiaohong Wang
A new electrochemical sensor based on isopolyacid anions (NH 4 ) 5 PV 8 Mo 4 O 40 (NPVMo) and transition metal zirconium dioxide (ZrO 2 ) nanocomposites was prepared in double signal amplification for the simultaneous detection of clenbuterol (CLB) and ractopamine (RAC). This is the first time that ZrO 2 was used as POM carrier to prepare electrochemical sensor. Scanning electron microscopic (SEM), nitrogen adsorption/desorption isotherms and X-ray diffraction (XRD) test showed that the synthesized ZrO 2 nanoparticles have a needlelike nanostructure and a larger surface area. The electrochemical measurements such as cyclic voltammetry (CV), amperometric and differential pulse voltammetry (DPV) indicated that the NPVMo/ZrO 2 /GCE exhibited much high stability, fast response, good conductivity and electrocatalytic actives, which enhanced peak current and negatively shifted the oxidation potentials of CLB and RAC. Due to the synergistic action between NPVMo and ZrO 2 nanoparticles, DPV results showed that the oxidation of CLB and RAC on NPVMo/ZrO 2 /GCE could be detected selectively and sensitively with low limits of detection, 5.03 × 10 −9 mol L −1 for CLB and 9.3 × 10 −7 mol L −1 for RAC, and a wide range for calibration curves of CLB and RAC from 0.1 to 1000 μM and 3.0 to 50 μM, respectively. In addition, the proposed sensor was applied to detect content of CLB and RAC in pork sample, and the recovery was over the range from 94.4 to 102.3%.
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高影响因子
ORGANIC ELECTRONICS
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2019
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IF 3.495
Caixia Ren,Yue He,Shiqi Li,Qinjun Sun,Yifan Liu,Yukun Wu,Yanxia Cui,Zhanfeng Li,Hua Wang,Yuying Hao,Yucheng Wu
Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted tremendous attention recently because of their excellent photovoltaic performance . High power conversion efficiency (PCE) and long-term stability of PSCs mainly rely on high crystalline quality of perovskite film, good interface contact between functional layers and matching energy level alignment, which can be achieved by crystal growth regulation and interface engineering. Here, we demonstrate a high-performance planar heterojunction PSCs with PCBM/N2200 as double electron transport layers (ETLs). The N2200-based PSCs exhibit an average PCE of 15.50%, which obviously surpass the average PCE of 14.18% of conventional PSCs with only PCBM as ETLs. In comparison with the conventional PSCs, the PCBM/N2200 double ETLs increase built-in potential of devices and decrease interfacial energy barrier of MAPbI 3 /PCBM and then result in higher V oc . Moreover, non-fullerene material N2200 can efficiently inhibit the aggregation of PC 61 BM, promote perovskite surface grain growth and passivate perovskite interface defect. All these are beneficial for electron transfer and extraction, and thereby increase the short-circuit current ( J sc ) and the Fill Factor (FF) of N2200 PSCs. In addition, N2200 obviously improve the air- and illumination-stability of PSCs. These results could stem from the interaction between PbI 2 as Lewis acid and N2200 as Lewis base. This work indicate that N2200/PC 61 BM as double ETL is an effective way to get high photovoltaic performance for the inverted planar heterojunction PSCs.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2019
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IF 6.019
Sixuan Chen,Jingjing Dong,Jian Wu,Shaochuan Hou,Jie Xing,Hao Liu,Huiying Hao
For future mass production, it is the best choice to fabricate highly efficient and stable perovskite solar cells (PSCs) in the ambient air. Interface modification is widely reported as an effective method for boosting the power conversion efficiency (PCE) and stability of PSCs. In our manuscript, CsBr as the interface modification material was introduced into the mesoporous TiO 2 (mp-TiO 2 ) via two ways: doping into the mp-TiO 2 layer and inserting between the mp-TiO 2 and perovskite films. It was found that CsBr interface modification, especially by doping into the mp-TiO 2 layer, can passivate the trap states originated from V O in mp-TiO 2 leading to enhanced carrier transport properties, meliorate surface property of mp-TiO 2 resulting in high-quality perovskite films, improve the carrier extraction and decrease the trap recombination in the interface. High-quality perovskite films, with increased grain size , reduced grain boundaries and pinholes, were obtained after CsBr modification, and further applied for the PSCs. The whole preparation process of the PSCs was finished in ambient air. The champion device with CsBr doped into the mp-TiO 2 layer yielded a highest PCE of 17.33%, while the pristine device showed a PCE of 14.95%. Furthermore, the champion PSC with CsBr doped into the mp-TiO 2 layer exhibited a much better stability, which could maintain over 80% of the original PCE after 1000h storing in ambient air without any encapsulation. This work presents an approach to develop air-processed efficient and stable PSCs by interface modification for future mass production.
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高影响因子
ORGANIC ELECTRONICS
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2019
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IF 3.495
Can Gao,Ziyang Hu,Cheng Yang,Haoyuan Xu,Yanyan Wang,Jing Zhang,Yuejin Zhu
Organic–inorganic hybrid halide perovskites are highly promising candidates for efficient photovoltaics , however, the long-term stability in ambient air still limits their further practical applications. Herein, the enhancement of both performance and stability of perovskite solar cells is reported by employing two-dimension (2D)/three-dimension (3D) planar perovskite films. The 2D/3D planar perovskites combine the advantages of the high-performance from the 3D perovskite and the stability from 2D-perovskite. It is found that the benefits of the 2D perovskite are attributed to ultrathin coverage on the 3D perovskite surface, which not only passivates the grain boundaries of the underlayer 3D perovskite, but also aligns the energy level between the perovskite and hole transport layers from a microscopic point of view. This work demonstrates that modulating 2D/3D planar films by hybridizing different species of perovskite is a feasible way to simultaneously enhance both efficiency and stability of perovskite solar cells.
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高影响因子
CARBON
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2019
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IF 7.466
Yahong Xie,Jian Cheng,Haichao Liu,Junli Liu,Buhaidiqie Maitituersun,Junhong Ma,Yue Qiang,Haokun Shi,Cong Geng,Yudong Li,Guihua Yang
Carbon-based perovskite solar cells (PSCs) have received widespread attention due to their low cost and high stability. The carbon electrode prepared by the doctor blade method easily forms defects at the interface between the perovskite layer, thereby reducing its photoelectric conversion efficiency (PCE). In this study, an easily deformable Co–Ni alloy@carbon aerogel was added between the carbon electrode and the perovskite layer via the grinding process, thereby effectively improving the interface quality and hole transporting ability. Correspondingly, the open-circuit voltage and fill factor of the hole-transport-material-free PSCs were significantly improved. A PCE of 12.71% was achieved, but it decreased to 10.77%, which remained at 86%, after 1296 h in the air. Chronoamperometry, Nyquist characterization, and capacitive effect were used to explain the cause of the hysteresis in the PSCs in detail.
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高影响因子
危险品化学品经营许可证（带存储）