SOLID-STATE ELECTRONICS
·
2016
·
IF 1.345
Xu Li,Yue Lu,Li Guan,Jiantao Li,Yichao Wang,Guoyi Dong,Aiwei Tang,Feng Teng
Hybrid organic/inorganic electrically bistable devices (EBDs) based on Cu 2 S/PVK nanocomposites have been fabricated by using a simple spin-coating method. An obvious electrical bistability is observed in the current-voltage ( I - V ) characteristics of the devices, and the presence of the buffer layer and the annealing process have an important effect on the enhancement of the ON/OFF current ratios. Different electrical conduction mechanisms are responsible for the charge switching of the devices in the presence and absence of the buffer layer.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 10
·
IF 1.866
Fei Fang,Fan Kong,Xueqin Zhang,Mengqi Lin,Yichi Zhang,Shounian Ding
A series of amphiphilic poly(N-vinyl carbazole) (PVK) block copolymers containing tris(8-hydroxyquinoline) aluminum (Alq 3 ) have been synthesized via reversible addition-fragmentation chain transfer (RAFT) radical polymerization with trithiocarbonate terminated polyethylene glycol (PEG) as a RAFT agent. The chemical structures of the block copolymers have been identified by 1 H nuclear magnetic resonance and Fourier transform infrared spectrometer. The analysis of gel permeation chromatography indicates that the polydispersity indices of the block copolymers are lower than 1.30. The results of thermogravimetric analysis show that the decomposition temperatures of the copolymers are higher than 330 ° C . The optical properties of the copolymers have been investigated and the obviously enhanced emission from Alq 3 has been found due to resonance energy transfer from PVK to Alq 3 . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44573.
研究领域:
高分子化学
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材料科学
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光电子学
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纳米功能材料
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聚合物合成
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荧光材料
·
能量转移
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chuangchuang Wei,Jihui Wang,Lijin Wang,Jinxing Zhao,Zhe Yin,Aiwei Tang
Perovskites have made remarkable advancements in optoelectronics owing to their high light absorption coefficient, tunable bandgap, and long charge diffusion. Nonetheless, the practical applications of Pb-based perovskites have been hindered by the instability and toxicity of Pb, especially in flexible electronics, which require high biosecurity and low toxicity. Hence, the development of stable Pb-free perovskite materials has gained increasing attention. In this study, we synthesized stable CsBi3I10 Pb-free perovskites outside the glovebox and improved the optoelectronic and mechanical performances of the CsBi3I10-based flexible devices through polyvinylcarbazole (PVK) doping. Flexible photodetectors with the device structure of PET/ITO/PEDOT:PSS/CsBi3I10:PVK/Au was fabricated. The results indicated that the introduction of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) reduced the surface roughness of the flexible PET substrate, while PVK doping further improved the surface smoothness of CsBi3I10 thin films, thereby enhancing the interfacial charge transportation. Moreover, PEDOT:PSS and PVK acted as stepwise hole transport layers in the photodetectors. The device demonstrated a maximum responsivity of 0.3 A/W, detectivity of 2.6 × 1011 Jones, and a response time of 102 μs at 650 nm. After subjecting it to 1000 bending tests, the light current retained 80% of its initial value. This study presents a universally applicable method for controlling the surface morphology of a flexible perovskite thin film.
研究领域:
材料科学
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光电材料
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Yaoyao Liu,Luhua Lan,Benchang Liu,Hong Tao,Min Li,Hua Xu,Jianhua Zou,Miao Xu,Lei Wang,Junbiao Peng,Yong Cao
Quantum dot light-emitting diodes (QLEDs) have received extensive academic and industrial attention for the exceptional properties of QDs including size-tunable emission wavelengths , narrow emission linewidths and inherent photo-physical stability. It is vital for the QLEDs performance to select appropriate hole transport materials due to the imbalance carrier injection caused by the higher electron mobility in most devices. In this paper, a small molecular material 1,1-bis [4-[N,N′-di (p-tolyl)amino]phenyl]-cyclohexane (TAPC) with high hole mobility was used to physically blend with poly-N-vinylcarbazole (PVK) as the hole transport layer (HTL) by solution processing. In the inverted red QLEDs, when the optimized mass ratio of the mixture HTL (2:1 of PVK:TAPC) was adopted, the device turn-on voltage drops from 4.0 V to 2.4 V, the maximum current efficiency (CE max ) reaches 19.3 cd/A, which is 50% higher than that of the standard devices (with only PVK as HTL), the maximum power efficiency (PE max ) significantly increases from 5.2 lm/W to 16.7 lm/W, increased by more than 3 times, the external quantum efficiency (EQE) reaches 45% enhancement from 8.7% to 12.6%, and the optimized device lifetime is enhanced by 4.5 times. The improvement of performances can be mainly attributed to the addition of TAPC with high hole mobility and suitable energy levels, and the unique charge generation between PVK:TAPC and hole injection layer (HIL) interface. The results demonstrate that the blending of the small-molecule and polymer hole transport materials will be a feasible approach to improve the performance in the QLEDs.
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 9
·6456-6468
·
IF 2.779
Ni Yafei,Li Haoyue,Li Haimin,Zhuang Jia,Liu Xingchong,Zheng Ronghong,Zhao Shuangshuang,Zhang Hua,Wang Hanyu
It is crucial to promote crystallinity of active layer to improve stability and restrain non-radiative carrier recombination for high-quality perovskite solar cells (PSCs). Here, Chlorpheniramine Maleate (CM) interface layer is introduced between SnO 2 electron transport layer (ETL) and perovskite (PVK) film. The esterification between carboxyl group in CM and hydroxyl group on the surface of SnO 2 greatly enhances the surface evenness of SnO 2 , leading to enhanced smoothness of ETL; thus, the crystallinity of perovskite (PVK) film is validly improved. Meanwhile, the lone pair electrons of nitrogen element in pyridine group in CM coordinate with vacant orbit of Pb 2+ in perovskite that validly decreases the defects of active layer. Thus, the CM interface results into strong connection between PVK and ETL, which greatly enhances the performance and stability of PSCs. After CM modification, the PCE of the PSCs is increased from 19.29 to 21.12%. In addition, unencapsulated CM-modified devices demonstrate much better humidity stability than unmodified one due to high quality of the perovskite film. After 100 h under RH = 70 ± 5% in air condition, the SnO 2 -CM based device still remains 60% of its initial PCE, while the PCE of unmodified device totally breaks down after 72 h.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Wu Tang,Hengyang He,Jianyou Shi,Bei Cao,Chuluo Yang,Cong Fan
Poly( N -vinylcarbazole) (PVK) containing the electron-rich carbazole moiety is exploited as a high-potential and high-capacity organic polymer cathode for dual-intercalation Na-ion batteries, which exhibits redox potential in the range of 2.5–4.6 V (vs. Na + /Na) and theoretical specific capacity of ~138 mAh g −1 . After proper optimizations, PVK can deliver average discharge capacities of ~110 mAh g −1 for 100 cycles under a low current density (50 mA g −1 ) and ~62 mAh g −1 for 900 cycles under a high current density (0.5 A g −1 ) using 1 M NaPF 6 in ethylene carbonate (EC) and diethyl carbonate (DEC).
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Maolin Mu,Wen Li,Lunyao Pan,Xiankan Zeng,Qungui Wang,Yongjian Chen,Chenglong Li,Di Shen,Xinning Wang,Shiyu Yang,Hongqiang Xin,Weiqing Yang
Achieving balanced charge injection and transport in perovskite light-emitting diodes (PeLEDs) remains challenging due to the large energy level offset between the indium tin oxide (ITO) electrode and the hole transport layer, coupled with an unsatisfactory hole injection capability. Given that Cu 2 ZnSnS 4 (CZTS) offers a deep valence band maximum, high hole mobility, high stability, and cost-effectiveness. Here, CZTS is introduced as a hole injection layer between the ITO and poly(9-vinylcarbazole) (PVK) layers to align energy level and increase hole injection capacity. The huge difference between CZTS and PVK work functions creates a robust interfacial electric field, resulting in an interfacial dipole effect, which significantly enhancing hole injection and boosting the carrier radiative recombination efficiency. Meanwhile, the robust CZTS/PVK interface favors high-quality FAPbBr 3 films with good morphology and reduced defects. The resulting optimized PeLEDs with a peak emission wavelength of 529 nm achieve an external quantum efficiency (EQE) of 15.44%, a turn-on voltage of 3 V and current efficiency (CE) of 75.3 cd A −1 , significantly outperforming the control devices, which exhibit an EQE of 7.55%, a turn-on voltage of 3.4 V and CE of 35.4 cd A −1 . This study provides novel insights into constructing efficient PeLEDs through enhanced hole injection using CZTS.
研究领域:
材料科学
·
光电子学
·
固体物理
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xin Zheng,Changting Wei,Shichen Yuan,Daqing Zhang,Xiansheng Li,Xin Luo,Weiling Lu,Bo Xu,Jing Huang
Hole-injection layers (HILs) play crucial roles in enhancing the performance of perovskite light-emitting diodes (PeLEDs) by lowering the energy barrier between the anode and the hole-transport layer (HTL). However, the commonly employed HIL, poly( 3 , 4 -ethylenedioxythiophene): polystyrene sulfonic acid (PEDOT: PSS) has notable drawbacks, such as extreme acidity and susceptibility to corrosion, which severely hampers device efficiency and stability. Herein, a self-assembled monolayer (SAM)-[ 2 -( 9H -Carbazol- 9 -yl) ethyl] phosphonic acid (2PACz) instead of PEDOT: PSS was employed in PeLEDs, which could reduce the negative impacts on neighboring perovskite sites and indium tin oxide electrodes. To obtain favorable energy level alignment between 2PACz and the perovskite layer, poly( 9 -vinylcarbazole) (PVK) was introduced as an indispensable HTL. Consequently, the 2PACz/PVK-based deep-blue PeLEDs exhibit a lower turn-on voltage of 3.20 V, and a peak external quantum efficiency of 4.42 % at 467 nm, which is a threefold improvement over the control devices. This impressive performance boost can be attributed to the reduction in interfacial defects and the improved balance of carrier injection, leading to more efficient light emission. Our study not only introduces an innovative and cost-effective HIL solution for PeLEDs but also provides valuable insights and guidance for the development of highly efficient and stable PeLEDs in the future.
研究领域:
材料科学
·
光电子学
·
光子学
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Liyan Yang,Yu Yan,Feilong Cai,Jinghai Li,Tao Wang
Conjugated polymer poly(9-vinylcarbazole) (PVK) has been explored as an efficient hole transport material (HTM) to replace poly(3,4-ethylenedio-xythiophene): poly(styrenesulfonate) (PEDOT:PSS) for the preparation of p-i-n type, inverted planar heterojunction perovskite solar cells. The PVK film can be facilely deposited by room-temperature solution-casting without any doping or post treatments. Using MAPbI 3 as the photoactive layer, a 15.8% stabilized power conversion efficiency was achieved in ITO/PVK/MAPbI 3 /PCBM/Ag devices, which is a significant improvement compared with 12.1% from devices using PEDOT:PSS as the HTM. The perovskite photoactive layer cast on PVK HTM has higher crystallinity and less PbI 2 residues, leading to a higher charge recombination resistance of the device. After a storage of 1000 h, the PCE of PVK- and PEDOT:PSS- based devices dropped to 82.5% and 56% respectively, and demonstrated that the PVK-based perovskite devices is more stable compared with the PEDOT:PSS-based devices.
研究领域:
材料科学
·
太阳能
·
有机电子
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jingling Li,Zheng Liang,Qiucheng Su,Hu Jin,Kelai Wang,Gang Xu,Xueqing Xu
For an organic–inorganic hybrid quantum dot light-emitting diode (QD-LED), enhancing hole injection into the emitter for charge balance is a priority to achieve efficient device performance. Aiming at this, we employ N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)benzidine (TPD) as the additional hole transport material which was mixed with poly(9-vinylcarbazole) (PVK) to form a composite hole transport layer (HTL) or was employed to construct a TPD/PVK bilayer structure. Enabled by this TPD modification, the green QD-LED (at a wavelength of 515 nm) exhibits a subband gap turn-on voltage of 2.3 V and a highest luminance up to 56 157 cd/m2. Meanwhile, such TPD modification is also beneficial to acquire efficient blue and red QD-LEDs. In particular, the external quantum efficiencies (EQEs) for these optimized full-color QD-LEDs are 8.62, 9.22, and 13.40%, which are 3–4 times higher than those of their pure PVK-based counterparts. Revealed by the electrochemical impedance spectroscopy, the improved electroluminescent efficiency is ascribable to the reductions of recombination resistance and charge-transfer resistance. The prepared QD-LEDs surpass the EQE values achieved in previous reports, considering devices with small-molecule-modified HTLs. This work offers a general but simple and very effective approach to realize the low turn-on-voltage, bright, and efficient full-color QD-LEDs via this solution-processable HTL modification.
研究领域:
材料科学
·
光电技术
·
半导体器件
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Tongzhou Wei,Haohong Jiang,Yuanhong Hu,Qiaoming Zhang,Liangqin Zeng,Junjie Guo,Lixiang Chen,Xingwen Tan,Ping Chen,Yanlian Lei
Integrating photodetector and photosynapse functions into a single device is crucial for advancing image perception in neuromorphic visual systems. However, the disparity in response speeds between these functionalities poses significant challenges for multimodal integration. Here, a multimodal optoelectronic device is presented based on a copper(I) thiocyanate (CuSCN)/poly(N-vinylcarbazole) (PVK):Y6 composite heterojunction, achieving ultraviolet (UV)-detection, UV-synapse, and near-infrared (NIR)-detection modes. The device allows seamless switching between modes by precisely tuning the operational voltage and/or adjusting the excitation light wavelength. The charge trapping at the CuSCN/PVK interface, coupled with the controllable movement of photogenerated carriers, enables this multimodal operation. Most importantly, through the synergistic interaction between modes, two optoelectronic applications are demonstrated: frequency-selective photoresponse for encrypted optical communications and NIR-assisted enhancement for image recognition. This work not only provides a straightforward method for multimodal operation within a single device but also highlights the potential for synergistic applications in artificial vision systems.
研究领域:
光电子学
·
神经形态工程
·
光子学
·
材料科学
·
通信技术
·
图像处理
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Min Yang,Qin Zhang,Wenjing Zhang,Zhongqi Hao,Yuancheng Qin,Xia Hai,Fangfang Li,Dan Zhou,Yubao Zhang
Improving the hole carrier mobility of organic hole-transporting materials is critical for the development of advanced quantum dot light-emitting diodes (QLEDs). Here, a simple method is reported for enhancing the hole-charge mobility in poly(9-vinylcarbazole), PVK. Doping of the PVK using the molecular Lewis acid tris(pentafluorophenyl)borane as a dopant is shown to have a powerful effect on the hole-charge mobility, and the performance of the QLEDs. By adjusting the amount of dopant, the p-type Hall mobility can be increased up to 3.3-fold, and thereby, the external quantum efficiency and current efficiency of QLEDs are improved by 132% and 249%, respectively.
研究领域:
材料科学
·
电气工程
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）