Article
Chemistry, Multidisciplinary
Ali Deniz Ozdemir, Simon Kaiser, Tobias Neumann, Franz Symalla, Wolfgang Wenzel
Summary: Organic light emitting diodes (OLED) are important for commercial displays and energy-efficient lighting. However, there are unresolved challenges in their development. Doped injection layers are commonly used to overcome charge injection barriers, but progress has been slow. Computer-aided methods can help accelerate device development. By using a kinetic Monte Carlo model, this study examined the effect of doped hole injection layers on injection barriers and device conductivity, providing insights for virtual device design.
FRONTIERS IN CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Sooyong Lee, Hwajeong Kim, Youngkyoo Kim
Summary: In this study, we demonstrate that the hole injection characteristics of phosphorescent OLEDs can be greatly improved by introducing a Lewis acid-doped conjugated polymer nanolayer. The presence of the conjugated polymer nanolayer leads to enhanced luminance and current efficiency in the OLEDs.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Chieh Lo, Sujith Sudheendran Swayamprabha, Tsung-Chia Hsueh, Sudam D. Chavhan, Rohit Ashok Kumar Yadav, Jia-Ren Lee, Kiran Kishore Kesavan, Sun-Zen Chen, Ching-Wu Wang, Jwo-Huei Jou
Summary: The study found that modifying the PEDOT:PSS hole injection layer significantly improves the performance of solution-processed OLEDs, with devices utilizing acetone-modified HIL showing the best performance.
ORGANIC ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Sooyong Lee, Hwajeong Kim, Youngkyoo Kim
Summary: This study reports the hole injection role of p-type conjugated polymer layer in phosphorescent OLEDs, showing that P3HT layer can improve charge injection, enhance luminance and efficiency of OLEDs, with the annealing condition significantly affecting device performance.
Article
Polymer Science
Jae Woong Jung, Seung Hwan Son, Jun Choi
Summary: The study demonstrates that the polyaniline composite film has enhanced electrical conductivity and suitable energy level matching with CH3NH3PbI3 to improve the photovoltaic properties of the device. The composite film-based devices achieved a maximum efficiency of 16.61%, which is 21.6% higher than the device with pristine polyaniline. Additionally, the reduced graphene oxide-based composite film showed superior long-term stability compared to the pristine polyaniline-based device, indicating great potential for high performance perovskite solar cells.
Article
Nanoscience & Nanotechnology
Vipul Agarwal, Yasemin Fadil, Alice Wan, Namrata Maslekar, Bich Ngoc Tran, Rabiatul A. Mat Noor, Saroj Bhattacharyya, Joanna Biazik, Sean Lim, Per B. Zetterlund
Summary: This study systematically investigated the impact of two anionic surfactants on the properties of polymer/graphene-based nanocomposite films. It was found that SDS significantly outperformed SDBS in terms of electrical conductivity and mechanical properties. The results demonstrate that nanocomposite properties can be effectively manipulated by altering the concentration and type of surfactant.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biochemistry & Molecular Biology
Ki-Wan Jeon
Summary: The study reports the synthesis and fabrication of highly thionated reduced graphene oxide and its LB film, revealing sensitive electronic transport properties and optical characteristics of the film to the thiol content.
Article
Chemistry, Physical
Yuki Morikuni, K. Kanishka H. De Silva, Pamarti Viswanath, Masanori Hara, Masamichi Yoshimura
Summary: This research article presents a method to fabricate conducting reduced graphene oxide (rGO) monolayer films through methane plasma treatment within few minutes, enabling the nanoscale characterization of local conductivity via conductive atomic force microscopy (C-AFM) and their applicability in highly transparent conducting electrodes.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Mohammed Abdelhameed, Mostafa F. Abdelbar, Mohamed Esmat, Wipakorn Jevasuwan, Naoki Fukata
Summary: This study investigates the hole-injection characteristics of dopant-free vanadium oxide (VOx) semiconductor thin films. The crystal structure of solution-processable VOx films changes with different annealing atmospheres. The VOx films show effective hole-injection properties due to their high work function, wide band gap, and presence of oxygen deficiencies. The vacuum-annealed VO2-x (B) film exhibits the best hole-injection ability. The use of VOx films as hole-injection layers has significant implications for the development of low-cost and durable electronics and optoelectronics devices.
Article
Chemistry, Physical
Fabricio A. dos Santos, Nirton C. S. Vieira, Naiara A. Zambianco, Bruno C. Janegitz, Valtencir Zucolotto
Summary: In this study, graphene oxide was reduced in two different ways to produce oppositely charged reduced graphene oxide sheets. By utilizing a layer-by-layer assembly technique, multilayers with different conductivities were successfully fabricated. Moreover, by introducing a biological recognition element, the devices were capable of detecting specific proteins at low concentrations.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Haider G. Abdulzahraa, Mustafa K. A. Mohammed, Arkan Saad Mohammed Raoof
Summary: Perovskite photovoltaics have emerged as a promising technology for next-generation photovoltaics. Developing a hole blocking layer (HBL) has proven to be a successful method in improving the efficiency of perovskite solar cells (PSCs). In this study, planar 3D/2D devices were developed using tin oxide (SnO2) modified with reduced graphene oxide (rGO). The modified HBL showed improvements in perovskite crystallization, optical absorption, and defect passivation at the perovskite/SnO2 interface, resulting in enhanced charge transfer and better work function alignment. The incorporation of optimized 3% rGO additive in the SnO2 layer led to champion performance in Jsc, Voc, and FF of the PSCs, with an efficiency boost from 16.48% to 20.98%. This HBL modification approach allows for defect passivation, further improving the performance of perovskite photovoltaics.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Applied
Young Eun Kim, Ara Ko, Ho Jin Jang, Sung Joon Yoon, Seung Hun Roh, Jun Young Lee, Jun Yeob Lee, Dukjoon Kim, Jung Kyu Kim, Kyoung Soo Yook
Summary: In this study, a novel thermally cross-linkable material was developed as the hole transport layer for OLEDs, addressing the dissolution issue of lower layers during solution-based fabrication, leading to improved quantum efficiency and stability of the devices.
Article
Materials Science, Multidisciplinary
Ruibin Xue, Gang Gao, Lei Yang, Liangge Xu, Yumin Zhang, Jiaqi Zhu
Summary: In this study, composite films of CuI-Cu2O were successfully developed, with improved surface morphology and electronic properties. The optimized CuI-Cu2O films demonstrated good transparency, low hole concentration, high hole mobility, and high conductivity. Additionally, the electrical properties of CuI-Cu2O films exhibited greater stability compared to pure CuI films.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Han Qiang, Wen He, Feiyu Guo, Jizhou Cao, Rui Wang, Zhihao Guo
Summary: In this study, self-supporting flexible supercapacitor electrodes made of TOCN/RGO/PPy film were prepared and exhibited excellent electrochemical performance and mechanical stability. The electrode showed high capacitance retention in charge-discharge cycles and bending tests. Furthermore, a solid-state supercapacitor assembled with CNF hydrogel films displayed outstanding specific capacitance and energy density.
ACS APPLIED NANO MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Alexandra M. L. Oliveira, Monica Machado, Gabriela A. Silva, Diogo B. Bitoque, Joana Tavares Ferreira, Luis Abegao Pinto, Quirina Ferreira
Summary: Graphene oxide, with its unique properties, has been widely used in nanomedicine as a component of drug delivery systems. Research studies have demonstrated its effectiveness in controlling drug dosage and timely delivery when incorporated into multilayer films. This review provides an overview of the latest research developments in biomedical applications using graphene oxide for drug delivery systems, including film production and characterization, in vitro and in vivo experiments, main applications of graphene oxide in biomedical devices, and its biocompatibility properties.
Article
Engineering, Environmental
Long Ji, Detao Liu, Yafei Wang, Ting Zhang, Hao Chen, Yanbo Li, Hualin Zheng, Yingguo Yang, Zhi David Chen, Wenyao Yang, Li Chen, Shibin Li
CHEMICAL ENGINEERING JOURNAL
(2020)
Review
Chemistry, Physical
Hao Chen, Hao Wang, Jiang Wu, Feng Wang, Ting Zhang, Yafei Wang, Detao Liu, Shibin Li, Richard V. Penty, Ian H. White
Article
Nanoscience & Nanotechnology
Ziji Liu, Hualin Zheng, Detao Liu, Zhiqing Liang, Wenyao Yang, Hao Chen, Long Ji, Shihao Yuan, Yiding Gu, Shibin Li
NANOSCALE RESEARCH LETTERS
(2020)
Article
Chemistry, Physical
Ting Zhang, Feng Wang, Hao Chen, Long Ji, Yafei Wang, Chun Li, Markus B. Raschke, Shibin Li
ACS ENERGY LETTERS
(2020)
Article
Engineering, Environmental
Hualin Zheng, Detao Liu, Yafei Wang, Yingguo Yang, Hao Li, Ting Zhang, Hao Chen, Long Ji, Zhi Chen, Shibin Li
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Environmental
Detao Liu, Hualin Zheng, Yafei Wang, Long Ji, Hao Chen, Wenyao Yang, Li Chen, Zhi Chen, Shibin Li
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Nanoscience & Nanotechnology
Hao Chen, Ting Zhang, Feng Wang, Wenyao Yang, Yafei Wang, Hualin Zheng, Long Ji, Shihao Yuan, Yiding Gu, Detao Liu, Xuefeng Peng, Li Chen, Shibin Li
Summary: A new additive, p-xylilenediamine bromide (PhDMADBr), is reported to facilitate the synthesis of high-quality and stable gamma-CsPbI3 films at a surprisingly low temperature of 60 degrees C. The additive improves film morphology and crystallinity, as well as phase stability and device performance. Photovoltaic cells based on the modified gamma-CsPbI3 film achieved a champion efficiency of 12.71% and retained 85% of its original efficiency after being kept for 1000 hours.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Hualin Zheng, Ting Zhang, Yafei Wang, Canzhou Li, Zhenhuang Su, Ze Wang, Hao Chen, Shihao Yuan, Yiding Gu, Long Ji, Jian Li, Shibin Li
Summary: By adding a zwitterion additive, high-efficiency 2D RPLP solar cells were successfully fabricated in ambient air, suppressing unfavorable phase morphology for charge transport and significantly improving stability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Detao Liu, Hualin Zheng, Yameen Ahmed, Chaoyue Zheng, Yafei Wang, Hao Chen, Li Chen, Shibin Li
Summary: The study demonstrates that using ionic liquid to modify SnO2 can improve the performance of f-PSCs and increase power conversion efficiency. This improvement is achieved mainly through enhancing interfacial charge transfer and intra-perovskite charge transport.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Long Ji, Ting Zhang, Yafei Wang, Detao Liu, Hao Chen, Hualin Zheng, Xuefeng Peng, Shihao Yuan, Zhi David Chen, Shibin Li
Summary: The addition of ethylammonium bromide (EABr) to the methylammonium tin iodide (MASnI(3)) perovskite precursor solution can regulate the crystallization dynamics, improve film morphology, and enhance efficiency and stability of the perovskite solar cells. The combination of EA(+) and Br- ions in the precursor solution results in a champion power conversion efficiency (PCE) of 9.59% and maintains 93% of initial efficiency after 30 days without encapsulation. This work provides a new strategy for high-efficiency tin-based perovskite solar cells.
Article
Chemistry, Physical
Xuefeng Peng, Xiaohui Yang, Detao Liu, Ting Zhang, Ye Yang, Chaochao Qin, Feng Wang, Li Chen, Shibin Li
Summary: The study found that the BMIM+ ions of the 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) ionic liquid effectively passivate the Pb-related defects in perovskite light emitting diodes, resulting in sufficient defect passivation and improved photoluminescence quantum yields and external quantum efficiency. This work demonstrates the potential of ionic liquid passivators for high efficiency PeLEDs and emphasizes the importance of passivator spatial distribution for adequate defect passivation.
ACS ENERGY LETTERS
(2021)
Article
Engineering, Environmental
Shihao Yuan, Ting Zhang, Hao Chen, Yu Ji, Yunhan Hao, Hualin Zheng, Yafei Wang, Zhi David Chen, Li Chen, Shibin Li
Summary: This study reports the use of a dual-functional molecular 2-Fluorothiophenol (FTP) to address the issues of ionic defects and humidity instability in FA-based perovskite solar cells. The results show that FTP can passivate defects and improve humidity stability, leading to an increase in solar cell efficiency. This research provides important technical support for the commercialization of FA-based perovskite solar cells.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Xuefeng Peng, Bingchen He, Hualin Zheng, Zhenhuang Su, Xiuzhi Li, Long Ji, Ting Zhang, Li Chen, Chaochao Qin, Xingyu Gao, Shibin Li, Xiaohui Yang
Summary: This study found that the phase distribution of Dion-Jacobson perovskites can be effectively modulated by DMSO vapor treatment, which improves the efficiency of perovskite light-emitting diodes and eliminates energy transfer gaps and losses.
ACS ENERGY LETTERS
(2022)
Article
Automation & Control Systems
Yiding Gu, Ting Zhang, Jian Li, Chaoyue Zheng, Mingye Yang, Shibin Li
Summary: A capacitive triaxial force sensor based on microcone dielectric layer and force decoupling method is proposed in this study, which can perfectly detect the lateral and vertical displacement of the top electrode relative to the bottom electrodes under external forces. The sensor structure along with the new decoupling method exhibits high sensitivity (3.5 kPa(-1)) for normal force in a low-pressure range and fast response (0.134 N-1, 26 ms) for tangential force. By mounting the sensors on the fingers of a robotic arm, effective tactile information during grasping task can be provided. Furthermore, a 3x3 tactile sensor array is fabricated for spatial pressure mapping. This work provides new insights into the design of piezocapacitive tactile sensors and demonstrates their great potential in robotic applications.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Nanoscience & Nanotechnology
Ting Zhang, Shibin Li
Summary: In this study, inorganic perovskites CsPbI2Br and CsPbIBr2 were investigated as photoactive materials, with anti-solvent processing allowing for improved film quality. Devices fabricated using these methods showed high performance and stability, demonstrating self-powered capabilities. This research highlights the potential of all-inorganic CsPbIxBr3-x perovskites in visible photodetection.
NANOSCALE RESEARCH LETTERS
(2021)
