MATERIALS LETTERS
·
2022
·
IF 3.574
Pujia Cheng,Dongping Zheng,Yingjie Zhang,Xinqi Chen,Tianjun Chen,Tiansheng Zhang,Fan Wu
An inorganic–organic hybrid bulk heterojunction (BHJ) consisting of a CuO nanocone array (NCA)/methyl [6,6]-phenyl-C61-butyrate (PC 61 BM) was fabricated on a fluorine-doped tin oxide substrate using a hydrothermal method. Scanning electron microscopy showed that the CuO-NCA/PC 61 BM BHJ hybrid structure was well-formed and that the PC 61 BM compactly filled the interspaces between the CuO nanocones. A FTO/CuO-NCA/PC 61 BM/LiF/Ag hybrid BHJ photodiode had a favorable type-II band alignment for charge separation, and this photodiode showed a nearly 10-fold enhanced photocurrent response compared with a FTO/CuO-NCA/LiF/Ag Schottky junction photodiode. Photoelectrochemical impedance spectroscopy and transient absorption spectroscopy demonstrated that the FTO/CuO-NCA/PC 61 BM/LiF/Ag BHJ device had better photogenerated charge transfer properties and a longer carrier lifetime compared with the FTO/CuO-NCA/LiF/Ag device.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Su Qiang,Chen Shuming
Up-conversion electroluminescence, in which the energy of a emitted photon is higher than that of the excitation electron, is observed in quantum-dot light-emitting diodes. Here, we study its mechanism by investigating the effect of thermal energy on the charge injection dynamic. Based on the results of temperature-dependent electroluminescence and theoretical analysis, we reveal that at sub-bandgap voltage, holes can be successfully injected into quantum-dots via thermal-assisted thermionic-emission mechanism, thereby enabling the sub-bandgap turn-on and up-conversion electroluminescence of the devices. Further theoretical deduction and experimental results confirm that thermal-assisted hole-injection is the universal mechanism responsible for the up-conversion electroluminescence. This work uncovers the charge injection process and unlocks the sub-bandgap turn-on mechanism, which paves the road for the development of up-conversion devices with power conversion efficiency over 100%.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 2
·283-291
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IF 3.85
Zheng Jihong,Zhu Liangxin,Shen Zhitao,Li Fumin,Ling Lanyu,Li Huilin,Chen Chong
An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells (PSCs). However, defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells. To solve this problem, this study incorporated a complex of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 into the CH 3 NH 3 PbI 3 active layer. The effects of different doping concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 on the performance and stability of PSCs were analyzed. Results showed that doping appropriate incorporation concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 in CH 3 NH 3 PbI 3 can improve the performance of the prepared solar cells. In specific, CdS and Cd(SCN 2 H 4 ) 2 Cl 2 can effectively passivate the defects in perovskite crystals, thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO 2 /perovskite interface. Due to the reduction of perovskite crystal defects and the enhancement of compactness of the CdS:Cd(SCN 2 H 4 ) 2 Cl 2 :CH 3 NH 3 PbI 3 composite film, the stability of PSCs is significantly improved.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 10
·2102069
·
IF 6.389
Haobin Wang,Yue Qiang,Shenshen Zheng,Peng Wei,Yahong Xie
Nanocrystalline tin (IV) oxide (SnO 2 ) as an electron-transport layer (ETL) has unique advantages in realizing highly efficient and stable planar perovskite solar cells (PSCs), especially showing great potential in the low-temperature preparation of large-area flexible carbon-based PSCs (C-PSCs). However, the high trap density on the surface of SnO 2 tends to cause serious nonradiative recombination losses, thereby reducing photoelectric performance. In this work, an inexpensive and easily obtained polymer poly(ethylene-co-vinyl acetate) (Eva) is used as a interfacial modifier to reduce the interfacial defects and nonradiative recombination losses at the SnO 2 /perovskite interface. As a result, the crystallinity and conductivity of the perovskite layer are significantly increased, and the charge lifetime and stability are effectively improved. The Eva modified SnO 2 -based C-PSCs obtain an optimal power conversion efficiency (PCE) of 12.29%, which is 25.7% higher than that of 9.78% for the unmodified C-PSCs. Furthermore, the unencapsulated devices maintain 88.6% and 91.9% of the initial PCE over 1 month in ambient air for the unmodified and Eva-modified C-PSCs, respectively. The study provides valuable experience for the development of highly efficient and stable C-PSCs using common polymers for interface modification engineering.
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JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Junjie Si,Huimin Sha,Bingyan Qu,Fei Wang,Xiaohu Ma,Chong Jia,Yiqing Chen
The unavoidable defect states located on the surface or grain boundaries (GBs) of the perovskite film can seriously deteriorate the performance and stability of perovskite solar cells (PSCs). In this work, an efficient and low-cost surface-active agent, sodium laurylsulfonate (SLS) has been incorporated into perovskite precursors in order to achieve effective defect passivation of humid air-fabricated PSCs. The zwitterionic SLS agent can not only improve crystallinity of perovskite film but also play the role of defect passivation originated from both negative- and positive-charged defect states. Density Functional Theory (DFT) calculation proves that the sulfonic acid group S=O and Na + cations in SLS passivator can bond with the uncoordinated lead and halogen ions, leading to the suppression of carrier non-radiative recombination. As a result, the performance of champion device with SLS additives improves from 16.68 to 19.93%. Moreover, SLS passivation agent can also enhance the long-term stability of unencapsulated devices under ambient condition, which maintains 91% of its initial efficiency after 21 days. This study probes into the zwitterionic surface active agent with π-conjugated system for long term defect passivation of perovskite optoelectronic devices.
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JOURNAL OF MASS SPECTROMETRY
·
2022
·Vol. 57
·期 3
·e4813
·
IF 2.394
Liutian Wu,Keke Qi,Minggao Xu,Chengyuan Liu,Yang Pan
Desorption electrospray ionization/post-photoionization (DESI/PI) is a newly developed ionization method by the combination of DESI and post-photoionization for the simultaneous imaging of polar and nonpolar compounds in biological tissues. Dopants are of great importance in DESI/PI for the enhancement of signal intensities through ion–molecule reactions. In this work, to evaluate the performance of dopants in DESI/PI, an efficient homogenate model was developed, and four kinds of dopants (toluene, chlorobenzene, bromobenzene, and anisole) were tested using homogenate of mouse brain tissue as target sample. The influences of the dopants on the signal enhancements of different compounds were explained reasonably by the ionization mechanism. Then, the dopants with their optimum volume contents were applied to the mass spectrometry imaging (MSI). For a comprehensive imaging of various compounds with different polarities, methanol/toluene/formic acid (7:3:0.1) was chosen as the best choice. Finally, the stronger quantitative ability of DESI/PI with toluene as dopant for a few compounds in mouse brain tissue was demonstrated.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Ke Zheng,Wenxi Li,Shaoqi Zhou,Guoru Huang
Although polydopamine (PDA)-related modification is widely studied in the fabrication of superhydrophobic sponges, the high cost of dopamine limits its widespread application. To imitate PDA modification, a low-cost and facile one-step poly(phenol-amine) modification was performed on melamine sponges in this study. Low-cost catechol and diethylenetriamine (DETA) were used as the monomers , and n -dodecanethiol was used as an additive in the one-step modification. The results confirmed that the poly(phenol-amine) aggregations were successfully anchored on the sponge skeleton surface and that the aggregations were formed via the Schiff base reaction and the Michael addition reaction. Furthermore, the as-prepared sponges still showed excellent mechanical properties after modification. Additionally, the optimally modified sponge (MS-0.5) exhibited superhydrophobic properties with a contact angle value above 150° under various environments, high oil-absorption capacity for various oils and organic solvents, high continuous oil–water separation performance with efficiency greater than 98.8% in 30 cycles, outstanding demulsification performance with 99.52% toward oil-in-water emulsion, and excellent recoverability and long-term stability. Thus, this work provides a feasible facile one-step modification method that can be used in place of PDA-related modification.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jian Yao,Jian Kong,Wenying Shi,Chao Lu
Generally, the high efficiency of solution-processable perovskite solar cells (PSCs) comes at the expense of using expensive organic matters as a hole-transport material (HTM). Although intense efforts have tried to use commercially available and low-cost macrocyclic molecules as HTM candidates, they still face two enormous challenges: poor solubility and inherent instability. Here, solvothermal treatment for old and insoluble HTMs (phthalocyanine (Pc) and its derivatives) has been proposed, which is unusual due to the occurrence of solubilization for insoluble precursors induced by the carbonization of the dissolved part. Since the macrocyclic structure still exists, the as-prepared new-type carbon dots not only retain the capacity of hole transfer but serve as an effective passivation additive. Synergy makes the all-air-processed carbon-based PSCs (CH3NH3PbI3) fabricated with carbon dots achieve a decent power conversion efficiency of 13.7%. Importantly, organics have undergone solvothermal treatment, completely breaking through the instability bottleneck, which exists in the long-term operation of PSCs. The universality of this methodology will usher exploration into other low-cost insoluble organics and drastically enhance the high-performance cost ratio of PSC equipment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 8
·5370-5379
·
IF 2.779
Hu Rong,Liu Zixiong,Zhang Jie,Tian Liangliang,Wang Gang,Chen Jinwei,He Kailin,Wang Ruilin
In this contribution, an optimized ternary solvent (chlorobenzene:chloroform:1,8-diiodooctane, CB:CF:DIO) was used to fabricate the high-efficiency polymer solar cells (PSCs). To analyze the effect of ternary solvent on the performance of PSCs, the relation among the morphology of active layer, charge generation-recombination and device performance of PM6:IT-4F solar cells was studied. The results showed that the morphology (i.e., aggregation state of donor and acceptor, phase separation degree) of active layer could be optimized at the ratio of 0.8:0.2 (CB:CF). Besides, we found that charge generation, charge transfer and charge mobility were improved in the CB:CF (0.8:0.2) processed PM6:IT-4F solar cells, thereby the charge recombination process in this device could be reduced compared with other CB:CF ratios processed devices. As a result, a power conversion efficiency of 12.85% was obtained in the CB:CF (0.8:0.2) processed PM6:IT-4F device.
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高影响因子
OPTIK
·
2022
·
IF 2.84
Taotao Zhang,Rui Xu,Hang Lv,Zhenxiang Wang,Haidong Ye,Haiqin Liu,Liang Chen
The light-emitting electrochemical cells (LECs) have received extensive attention from researchers in recent years due to their simple single-layer structure, air-stable metal electrodes, and low manufacturing cost. So far, reports on the use of LEC active layer emitter materials have mainly focused on ionic transition metal complexes (iTMCs) and conjugated polymers (CPs). The application of the above materials in blue LECs is restricted due to high cost, complicated synthesis process, and poor stability, which results in the slow development of blue LECs. A novel blue LECs device based on aggregation-induced emission (AIE) small molecule (2,3-diphenylbenzo[ b ]thiophene S, S-sulfur dioxide, DP-BTO) with a peak luminance of 36.58 cd/m 2 , a CEmax of 1.14 cd/A, and an EQEmax of 0.46% was reported in this work. The blue light emission centered at ~460 nm was exhibited at a voltage above 6 V. This work successfully constructed blue light-emitting LECs devices based on AIE materials, opening up a new research avenue for the application of AIE materials in the field of thin-film device development.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 19
·10750-10758
·
IF 14.511
Hanyu Wang,Wenjing Zou,Yukun Ouyang,Xiong Deng,Hu Luo,Juehao Xu,Xingchong Liu,Haimin Li,Xiaoli Gong,Yue Lei,Yafei Ni,Yongshan Peng
Ionic defects in perovskite films decrease both the power conversion efficiency (PCE) and stability of a perovskite solar cell (PSC). Herein, fluorinated D-pentafluoro-phenylalanine (D-PFPAA) zwitterions are introduced into a perovskite to passivate the ionic defects and effectively consolidate the Pb–X framework to suppress ion migration. The results demonstrate that the amino, carboxyl, and fluorine groups in D-PFPAA can support the multifunctional passivation of both positive and negative ionic defects, including uncoordinated Pb2+ ions and halogen (X−) defects in the perovskites, thereby effectively suppressing charge recombination. Consequently, a D-PFPAA-modified device shows a highest PCE of 21.56% with an increased open circuit voltage of 1.15 V. Apart from the consolidated Pb–X framework, resulting from multifunctional passivation, the fluorine groups in D-PFPAA can also form an effective hydrophobic barrier to protect the perovskite film from moisture-related erosion. As a consequence, the D-PFPAA-modified device retains more than 85% of its original PCE after undergoing 500 h of aging at 45% relative humidity under ambient conditions. This work provides a promising strategy for the realization of efficient and stable PSCs via the selection of fluorinated zwitterions to passivate the ionic defects, inhibit ion migration, and protect against moisture damage.
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Advanced Optical Materials
·
2022
·Vol. 10
·期 7
·2102320
·
IF 10.05
Jiajun Wei,Liting Tao,Liqi Li,Minxing Yan,Chenhao Wang,Wei Sun,Deren Yang,Yanjun Fang
Metal halide perovskites (MHPs) have emerged as promising X-ray detection materials. However, most MHP-based X-ray detectors are incompatible for large-area preparation and integration, and suffer from the serious ion migration issue. This work demonstrates a “perovskite-in-a-host” nanocomposite structure for X-ray detection, by embedding the perovskite nanocrystal (PNC) sensitizers in the organic interpenetrating charge transport channels to work as the X-ray attenuation layer. Intriguingly, the photon sensitization mechanism can be readily tuned from indirect- to direct-type X-ray conversion by decreasing the ligand density on the PNC surface, which significantly increases the sensitivity to 5 696 µC Gy air –1 cm –2 . Besides, the ion migration gets suppressed due to the ion blocking effect of the surrounding organic phase. Therefore, an ultra-small dark current relative drift of 3.57 × 10 –9 cm s –1 V –1 is achieved even under an extremely large electric field up to 5 100 V cm –1 , ensuring a low detection limit down to 72 nGy air s –1 . The superior sensitivity and biasing stability enable the high performance X-ray imaging capability of the devices, which exhibit great potential in scaling up and integration for the flat panel imaging.
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