CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Lina Hu,Chenxi Zhang,Yukun Wu,Shiqi Li,Fan Zhang,Jingkun Ren,Yang Hao,Qinjun Sun,Yulin Wang,Yuying Hao
The stability of perovskite solar cells (PSCs) is a major problem limiting their application. Here, we proposed a feasible solution using bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (HALS-770) as top protection layer of perovskite. HALS-770 interlayer can not only improve the antioxidant ability of perovskite by removing superoxide (O 2 ·- ) with help of hindered amine groups, but also suppress the internal and external degradation path of perovskite due to the co-existence of hydrophilic and hydrophobic groups. Moreover, it can block volatilization of organic cation and the migration of Ag + and I - , thus improve thermal stability of perovskite and alleviate destruction of Ag electrode. In addition, the heterocycles N atom and carbonyl group in HALS-770 interact with the under-coordinated Pb 2+ , reducing the interface defects. As a result, the unencapsulated device maintains excellent stability over 95 % of its initial efficiency after 30 days in ambient condition with about 25–50 % humidity, and possesses remarkable continuous operation stability with projected T80 > 1400 h at maximum power point tracking in glove box, much higher than those of the pristine device. Meanwhile, HALS-770 enable the PCE of 21.88 % for PSC (0.06 cm 2 ), which is among the highest efficiencies for MAPbI 3 based PSCs with p-i-n structure, and the PCE of 19.07 % for PSM (4 cm 2 ). And it is also suitable for FAMA-based devices with n-i-p structure, enabling an efficiency of 23.03 % (0.06 cm 2 ) and excellent stability.
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高影响因子
ORGANIC ELECTRONICS
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2024
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IF 2.7
Xiaoyan Tu,Pengtian Liu,Gong Zhang,Guozhen Bai,Zilong Wang,Zhidong Lou,Yanbing Hou,Feng Teng,Yufeng Hu
Organic flexible transparent electrically erasable nonvolatile memory presents significant potential for integration into bendable, stretchable, and transparent electronic devices. This capability unlocks a broad spectrum of potential applications in various fields, including wearable devices, medical equipment, and smart buildings. Polyethylene oxide (PEO) is a promising candidate for these devices due to its broad band gap, mechanical flexibility, chemical and thermal stability, water solubility, biocompatibility, and low cost. This study demonstrates a flexible transparent nonvolatile memory device utilizing a PEO and fullerene blend film. The average transmittance of the PET/ITO/PEO:PC 61 BM multilayer stack exceeds 86% in the optically visible range from 380 nm to 800 nm. The PET/ITO/PEO:PC 61 BM/Al device exhibits typical nonvolatile memory behavior, with the maximum electrical ON/OFF state ratio exceeding 10 3 . Furthermore, retention tests for both ON and OFF states, along with bending cycle measurements and Write-Read-Erase-Read cycle endurance tests, indicate that the device remains stable under ambient conditions. The electrical conduction transition mechanisms are attributed to the formation of carbon filaments by PCBM aggregates.
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ACS Nano
·
2025
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IF 16
Xiankan Zeng,Qiming Yin,Lunyao Pan,Yongjian Chen,Chenglong Li,Maolin Mu,Qungui Wang,Wen Li,Weiqing Yang
CsCu2I3 light-emitting diodes (LEDs) have attracted tremendous interest due to their environmental friendliness, low-cost processing, and broadband luminescence properties. However, their hole injection efficiency usually towers over electron injection efficiency owing to the intrinsic Cu vacancy-mediated excess hole concentration and wide bandgap of CsCu2I3, generating severe charge imbalance. Here, we designed an inorganic interfacial dipole layer (IDL) based on lithium chloride to exert a hole delayed-release effect for charge balance in CsCu2I3 LEDs by selectively modulating the energy levels of the contact layers. Accordingly, the IDL-based CsCu2I3 LEDs exhibit a record champion brightness of 2620 cd/m2 along with a three times enhanced peak external quantum efficiency of 3.73% at 565 nm. Meanwhile, the universality of the hole delayed-release effect of inorganic IDLs is verified by demonstrating enhanced CsCu2I3 LEDs incorporated with other alkali metal salt-based IDLs. This work provides a comprehensive guideline for optimizing the charge transport of lead-free LEDs by charge delayed-release effect of IDLs toward next-generation eco-friendly display applications.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Hao Xu,Xingting Liu,Shanlei Xu,Kin-Long Wong,Xinjie Zhou,Huilong Chen,Yijin Lin,Renyong Geng,Weiguo Zhu,Jun Yin,Xin Song
Moderate charge transporting capacity together with inexpedient energetic level alignment of the self-assembled molecules (SAMs) initiate severely interfacial non-radiative recombination in organic solar cells (OSCs), which significantly hinder the performance and robustness of corresponding devices. Herein, a molecular isomerization strategy is developed to construct promising SAM for efficient and reliable OSC devices, where chlorine atoms are grafted on either para- (pCl-ph) or meta- (mCl-ph) location in benzene sidechain substituted carbazole terminal group. In comparison with para location, we found the meta -Cl substation can instigate the intermolecular interaction and further boost molecular packing, which is beneficial to strengthen the carrier conductivity and ameliorate the trap density. Furthermore, the optimal work function tunability of mCl-ph trigger the favorable energy-level layout, whereas over deep-lying level arrangement of pCl-ph induced the circumferential charge accumulation and further catalyze the insufferable non-radiative recombination loss. Consequently, the champion power conversion efficiency (PCE) is upgraded from 16.1 % (pCl-ph) to 19.6 % (mCl-ph) with superior generality in diverse blend system. More strikingly, the raised operation stability (T80:575 h) is harvested in mCl-ph devices (pCl-ph devices T80:111 h), demonstrating that SAM isomerization is an appealing approach for OSCs with high efficiency and stability simultaneously.
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Journal of Materials Chemistry C
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2024
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IF 5.7
Bin Liu,Junhan Guo,Yang Tang,Liang Qin,Zhidong Lou,Yufeng Hu,Feng Teng,Yanbing Hou
Micro–nano organic–inorganic hybrid lead halide perovskites have become some of the most promising materials for optoelectronic applications due to their excellent photoelectric properties. The micro–nano scale laser device made using these materials would be an ideal light source for integrated photonics. The preparation methods of perovskite crystals grown via solution processing have improved a lot, but it is difficult to prepare discrete Fabry–Pérot (F–P) mode optical resonators with high-quality factor and small volume on the substrates due to random nucleation and excessive nucleation points. Hence, we used silver nanowires to induce the crystallization of perovskite crystallites, forming a perovskite/silver coupling structure and achieving an efficient laser. The directional distribution matrix of perovskite crystallites was obtained by adjusting the directional distribution of silver nanowires by using a controllable pulling method. By adjusting the concentration of the perovskite precursor solution, the aspect ratio of the crystallized perovskite microcrystals can be regulated, thus achieving the resonance modes of different perovskite microcavities. The results would open up an alternative approach to achieve controllable growth of perovskite crystallites.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Tao Sun,Meng Qi,Qing-Xiu Li,Hang-Fei Li,Zhi-Peng Feng,Run-Ze Xu,You Zhou,Yu Wen,Gui-Jun Li,Ye Zhou,Su-Ting Han
Gait is among the most dependable, accurate, and secure methods of biometric identification. However, high power consumption and low computing capability are two major obstacles on wearable sensors-based gait recognition system. In this work, an integrated system is reported combining a triboelectric nanogenerator (TENG), a memristor (Ag/HfO x /Pt), and perovskite-based multicolor LEDs (PMCLED) for the visualization and recognition of foot patterns through signal-on-none and multi-wavelength on-device preprocessing. The flexible TENG acts as a sensory receptor, generating voltage based on the duration and intensity of pressure, which in turn promotes voltage-triggered synaptic plasticity in the memristor. The PMCLED, with its threshold switching and multi-wavelength emission characteristics, enables nonlinear filtering and amplification of the synaptic signal from the memristor, resulting in a simplified system design and reduced background noise. Additionally, the effectiveness of on-device preprocessing is validated based on a 5 × 5 array of integrated devices and software-built neural network for foot pattern visualization and recognition. The proposed system is able to recognize the on-device preprocessed images with high accuracy, indicating great potentials in both healthcare monitoring and human-machine interaction.
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高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Chenyang Shi,Ningxia Gu,Zeyuan Sun,Jie Xiong,Pingfan Du,Lixin Song
Simplified structure perovskite solar cells (PSCs) without typical charge transport layer (CTL) have attracted much attention because of their simple manufacturing, low production costs, great stability, and high power conversion efficiency. However, it still has lots of challenges, such as poor interface contact and mismatched energy level, which limits the electron transfer and extraction as well as the photovoltaic performance of the device. In this work, a bifunctional monolayer 3-Chloropropyltriethoxysilane is self-assembled on FTO and applied in electron transport layer (ETL)-free PSCs. A dipole layer was developed, which could bend the band at the FTO/perovskite interface, improve interface contact, enhance the carrier transfer, and inhibit the charges recombination. The chloridion of silane forms halogen bonds with the uncoordinated Pb 2+ ions of the perovskite, thereby passivating the defects of the perovskite films and improving the quality of perovskite films. Eventually, the ETL-free with 3-CPTES SAM PSCs achieves a 21 % efficiency, which has increased by 40 % compared to 14.93 % of the pristine device. Concurrently, the perovskite solar cell (PSC) based on the modified FTO demonstrates notable stability improvements under various environmental and extreme conditions. Specifically, the PSC maintains 79.7 % PCE under high temperature conditions, 77.8 % under high humidity conditions, and an impressive 62.6 % under illumination.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Kaiyu Yang,Baolin Xu,Qiuxiang Lin,Yongshen Yu,Hailong Hu,Fushan Li
Perovskite light-emitting diodes (PeLEDs) have attracted wide attention due to their excellent photoelectric properties. A variety of additives have been studied for perovskite emission layers to enhance the performance of PeLEDs. However, the buried interface, which also has significant influence on the crystallization kinetics and exciton recombination dynamics of the perovskite emission layer, remains to be explored. In this work, we introduced a new ionic liquid 1-Ethyl-3-methylimidazolium dicyanamide (EMIM DCA) with the characteristics of low viscosity and high conductivity into the interfacial layer between the hole transport layer (HTL) and the perovskite film. Due to the strong interaction between the EMIM DCA and perovskite, the crystallization of the perovskite film is obviously improved and the defects at the interface are well passivated. As a result, the nonradiative recombination in the interlayer is significantly reduced. In addition, the introduction of EMIM DCA promoted the injection of charge carriers, thus achieving a high luminance of 32310 cd m −2 and enabling the maximum external quantum efficiency (EQE) of the PeLEDs increased from 10.2 % to 18.7 %.
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ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Zhenwang Luo,Weisheng Wang,Junhui Wu,Guohua Ma,Yanna Hou,Cheng Yang,Xu Wang,Fei Zheng,Zhenfu Zhao,Ziqi Zhao,Liqiang Zhu,Ziyang Hu
The increasing computational demands of artificial intelligence (AI) algorithms are exceeding the capabilities of conventional computing architectures, creating a strong need for novel materials and paradigms. Memristors that integrate diverse resistive switching (RS) behaviors provide a promising avenue for developing novel computing architectures. In this study, we achieve the coexistence of volatile and nonvolatile RS behaviors in quasi-2D perovskite memristor (Q-2DPM). The Q-2DPM exhibits competitive performance as a nonvolatile memory. Multiple synaptic functions have been successfully simulated on Q-2DPM, such as excitatory postsynaptic currents, paired-pulse facilitation, and long-term potentiation/depression. Furthermore, artificial neural networks using Q-2DPM synapses achieve high accuracy in MNIST image classification tasks. The Q-2DPM’s inherent characteristics suitable for reservoir computing are also demonstrated through its application in a pulse-stream-based digital classification experiment, showcasing its impressive performance. The elucidation of the dual RS mechanisms within Q-2DPM provides fresh insights into memristor RS behavior and underscores the potential of achieving diverse computational units through a single device. This work paves the way for the implementation of physical neuromorphic hardware architectures and the advancement of sophisticated computational primitives, offering a significant step toward the next generation of computing technologies.
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PubMed
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Xudong Fan,Huibo Zhang,Kang Li,Zhongxin Dong,Jie Huang,Feng Teng,Haibo Fan,Hui Jiang,Xuexia He,Peng Hu
Organic molecules have attracted much attention for lithium-ion batteries due to the flexibility, adjustable performance through molecular design, and low cost. However, the high solubility in electrolytes and low conductivity hindered their utilization in battery applications. In this work, four organic charge transfer cocrystals are synthesized by using p-fluoranil (FA) as the acceptor molecule and pyrene, benz[a]anthracene (BAA), chrysene and perylene as the donor molecules. The resulting cocrystals demonstrated superior specific capacity and cycling stability compared to its monomer counterparts. Specifically, the pyrene-FA cocrystal exhibited the highest reversible capacity of 206 mAh g-1 after 300 cycles at a current density of 0.1 A g-1, and maintained excellent cycling stability over 420 cycles. Even at a high current density of 1 A g-1, the pyrene-FA cocrystal displayed the highest reversible capacity of 250 mAh g-1 and remarkable cycling stability over 4500 cycles. The good high specific capacity and cycling stability attributed to the one-dimensional columnar structure and low solubility in the electrolyte of cocrystals. This study indicates that charge transfer can effectively improve the specific capacity and cycling stability of organic small molecules-based Li-ion battery.
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Materials Today Physics
·
2024
·
IF 10
Yongjian Chen,Cheng Yan,Zhenyu Chen,Xiankan Zeng,Qungui Wang,Shiyu Yang,Lunyao Pan,Chenglong Li,Maolin Mu,Wen Li,Guanqi Tang,Weiqing Yang
Unbalanced electron-hole injection in perovskite light-emitting diodes (PeLEDs) has always been a major stumbling block limiting device performance. Here we develop a heterointerface Coulomb enhancement strategy to efficiently promote electron injection between perovskite emitter and transport layer and thereby balance the electron-hole recombination equilibrium through manipulating defect-rich positive-charge centers induced Coulomb interactions in LiF interlayer. Through multiscale polarization response characterizations combined with capacitance-voltage and electrochemical impedance spectroscopy, it is confirmed that diffusing holes trapped in LiF layer leads to the increased interfacial polarization. Moreover, the polarization response reversal and high-frequency-dependent dissipation sensitivity further corroborate the LiF-induced interfacial Coulomb enhancement mechanism. The universality of the concept is also successfully verified in devices with electron-only, hole-only, and PN structures. Consequently, the modified PeLEDs show a lower leakage current, along with a significant performance improvement by 1.9 times in external quantum efficiency (18.8%) and 5.7 times in luminance compared with control samples. This study provides a unique perspective to promote carrier transport balance by taking advantage of physical effects within interlayer.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kexin Li,Bin He,Ruirui Wang,Ruiyi Yan,Ruirui Zhang,Ruixia Liu
The selective oxidation reaction of cyclohexane is one of the typical activated sp 3 C-H reactions, and its product adipic acid (AA) is the indispensable raw material used to produce nylon. However, subjecting to the inertness of C-H bond and the great reactivity of AA, the targeted transformation of cyclohexane remains a challenge. Here, the interfacial hydrogen bond (IHD) was developed by anchoring CeO 2 on graphite carbon nitride (g-C 3 N 4 ) surface, which could boost targeted acquisition adipic acid from aerobic oxidation of cyclohexane. The results indicated that the IHD effect can be flexibly regulated by changing the ratio of Ce 3+ /Ce 4+ , further optimizing the properties of surface OH species and Lewis acid sites. Under the synergistic effect of Ce 3+ /Ce 4+ and Lewis acid sites on reaction interface, the glorious performance (32.2% conversion of cyclohexane with 66.4% selectivity) was obtained over the as-prepared CeO 2 /g-C 3 N 4 IHD system. In addition, the interfacial adsorption properties of cyclohexane were explored by the virtue of in situ infrared spectroscopy, revealing the IHD effect could tune the adsorption behavior of cyclohexanone and further improve the selectivity of AA. This work disclosed that engineering the interface hydrogen bond effect between CeO 2 and g-C 3 N 4 provided feasible strategies to obtain excellent catalyst for cyclohexane oxidation.
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