Review
Chemistry, Multidisciplinary
Zhaoning Hu, Yixuan Zhao, Wentao Zou, Qi Lu, Junhao Liao, Fangfang Li, Mingpeng Shang, Li Lin, Zhongfan Liu
Summary: Graphene films are potential materials for future electronics and optoelectronics. Chemical vapor deposition (CVD) can produce large-area graphene films with excellent scalability, controllability, and quality. Graphene doping is an important pathway for realizing desired applications, but current challenges include doping stability and carrier mobility.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Jung Sun Ko, Dong Hee Shin, Won Jun Lee, Chan Wook Jang, Sung Kim, Suk-Ho Choi
Summary: This study presents a novel all-two-dimensional vertical-heterostructure photodetector with a balance between performance and comfort, showing promising applications in flexible, foldable, and/or semitransparent electronic/optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Shuai Fu, Indy du Fosse, Xiaoyu Jia, Jingyin Xu, Xiaoqing Yu, Heng Zhang, Wenhao Zheng, Sven Krasel, Zongping Chen, Zhiming M. Wang, Klaas-Jan Tielrooij, Mischa Bonn, Arjan J. Houtepen, Hai Wang
Summary: Through studying the photoconductivity and transient absorption dynamics in graphene-WS2 heterostructures, it was found that separated charges in the heterostructure following charge transfer have an extremely long lifetime, which is crucial for optimizing the performance of optoelectronic devices. Additionally, the charge transfer process across graphene-WS2 interfaces was identified to occur via different mechanisms for sub-A-exciton and above-A-exciton excitations, providing insights for further device optimization, particularly in photodetection applications.
Article
Chemistry, Physical
Yongzhi Zhang, Xianjue Chen, Wanglai Cen, Wenhao Ren, Haocheng Guo, Sicheng VVu, Yang Xiao, Sheng Chen, Yong Guo, Dan Xiao, Chuan Zhao
Summary: In this study, a flash-assisted doping method was proposed to efficiently produce nitrogen- and sulfur-doped graphene. Using this method, graphene oxide was reduced to few-layer graphene in seconds without the use of reductants, accompanied by a high doping efficiency. The synthesized nitrogen- and sulfur-doped graphene exhibited superior potassium-ion storage capability.
Article
Chemistry, Physical
Tianqi Bao, Xueke Yu, Xiaolong Wang, Jijun Zhao, Yan Su
Summary: Ultrafast charge separation and slower electron-hole recombination can be achieved in semiconductor materials by utilizing time-dependent heterostructures with type-II band alignments, which is crucial for photocatalyst and photovoltaic applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Tianqi Bao, Xueke Yu, Xiaolong Wang, Jijun Zhao, Yan Su
Summary: Ultrafast charge separation and slower electron-hole recombination were observed in MoSSe and WSSe lateral and vertical heterostructures with type-II band alignments, making them excellent candidates for photocatalysts. By combining TD-DFT with NAMD, the transfers of electron and hole were found to occur in a few hundreds of femtoseconds in the vertical heterostructure and a few tens of femtoseconds in the lateral heterostructure, driven by an out-of-plane vibration mode. The electron-hole recombination time was relatively long, with the vertical heterostructure having a recombination time 3 times longer than the lateral heterostructure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Wei Wang, Qiang Luo, Linqian Li, Yifan Wang, Xiaobing Huo, Shipeng Chen, Xiwen Du, Ning Wang
Summary: This study reports a nickel single atom isolated on a sulfur-functionalized graphitic carbon nitride/reduced graphene oxide 2D heterostructure that enables exceptional uranyl photoreduction. The single atom anchored semiconductor shows a high removal rate and extraction capacity, making it promising for efficient uranyl removal from uranium-contaminated aqueous environments.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Rui Yang, Mengtao Sun
Summary: In this paper, the theoretical investigation of the interaction between graphene and hexagonal boron nitride (h-BN) was conducted. The results show that the optical absorption of transparency excitons in the graphene/h-BN heterostructure has different physical mechanisms in near violet, visible, near IR, and IR regions. The manipulation of the band gap of graphene on h-BN substrate with different layers was also demonstrated.
CHINESE JOURNAL OF PHYSICS
(2022)
Review
Chemistry, Physical
Lai-Peng Ma, Wencai Ren, Hui-Ming Cheng
Summary: Graphene has shown great promise in next-generation electronic and optoelectronic devices due to its atomic thickness and exceptional electrical/optical/thermal/mechanical properties. Surface charge transfer doping is an important strategy to modulate graphene's electrical and optical properties, with advantages such as minimal negative impact on carrier mobility, precise control over doping concentration, and efficient treatment processes. Therefore, developing strong and stable surface charge transfer dopants is necessary to improve graphene's performance for applications in electronics and optoelectronics. However, there are still challenges to overcome in this field.
ACTA PHYSICO-CHIMICA SINICA
(2022)
Article
Chemistry, Physical
Junyi Liu, Xu Zhang, Gang Lu
Summary: In this work, the excited state dynamics in a WS2/graphene heterostructure are investigated through first-principles calculations, providing insights into the charge and energy transfer mechanisms. It is found that charge transfer is primarily driven by interlayer Auger-like processes due to strong electron-hole interactions, rather than direct interlayer excitations. The electron-phonon coupling is unable to compete with Auger processes due to phonon bottleneck. Additionally, the asymmetrical dynamics are attributed to the difference in density of states of the heterostructure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yang Liu, Yingtian Xu, Chongyang Xu, Jiahao Chen, Heng Liu, He Zhang, Liang Jin, Jie Fan, Yonggang Zou, Xiaohui Ma
Summary: In this study, a Ti3C2Tx/graphene vertical heterostructure (TG-VHS) is successfully used as a saturable absorber (SA) to generate femtosecond laser pulses via passive mode-locking, demonstrating the potential of MXenes-based heterostructures for ultrafast photonics. The study provides an important strategy for developing VHS SAs for ultrafast pulse fiber lasers and opens new perspectives for designing advanced MXenes-based photonic devices.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Xiao Ma, Rene A. J. Janssen, Gerwin H. Gelinck
Summary: The performance of organic photodetectors is improving, but is still lower than the intrinsic limit. Chemical impurities and structural defects create carrier trapping states, impacting the electrical performance. This review focuses on trap-assisted charge generation and recombination in organic photodiodes and their effect on various performance parameters.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Daniel J. Rizzo, Sara Shabani, Bjarke S. Jessen, Jin Zhang, Alexander S. McLeod, Carmen Rubio-Verdu, Francesco L. Ruta, Matthew Cothrine, Jiaqiang Yan, David G. Mandrus, Stephen E. Nagler, Angel Rubio, James C. Hone, Cory R. Dean, Abhay N. Pasupathy, D. N. Basov
Summary: The researchers successfully created nanometer-scale lateral p-n junctions using graphene/alpha-RuCl3 heterostructure near graphene nanobubbles. Through STM/STS and s-SNOM techniques, they investigated the electronic and optical responses of nanobubble p-n junctions, achieving p-n junctions with a width of around 3 nm and an electric field of approximately 10(8) V/m. The study also utilized ab initio density functional theory calculations to corroborate experimental data and provide insights into charge transfer mechanisms in 2D materials.
Article
Chemistry, Physical
Xiaoli Wang, Run Long
Summary: Photoinduced charge separation in lateral MoS2-graphene junctions is significantly influenced by a nonadiabatic mechanism, where electrons rapidly transfer from MoS2 to graphene within 200 fs. This ensures successful extraction of hot electrons before they lose energy to heat.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Pengfei Shen, Pei Yin, Yongtao Zou, Mu Li, Nanqiu Zhang, Dan Tan, Haiyang Zhao, Quanjun Li, Rusen Yang, Bo Zou, Bingbing Liu
Summary: The catalytic activity of 2D materials has been studied and their unique structural and electronic properties contribute to their success in conventional heterogeneous catalysis. Piezocatalysis based on heterojunctions has attracted attention because of band-structure engineering and enhanced charge carrier separation. A reduced graphene oxide (rGO)-MoS2 heterostructure is designed to tackle challenges such as finite active sites, catalyst poisoning, and poor conductivity. The heterostructure exhibits a record-high piezocatalytic degradation rate, which is significantly higher than that of MoS2 nanosheets. The mechanism of this behavior opens up new possibilities for developing efficient catalysts for wastewater treatment and other applications.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Cheng-Chieh Lin, Kai-Di Yang, Min-Chuan Shih, Shao-Ku Huang, Tzu-Pei Chen, Hung-Chang Hsu, Ching-An Chuang, Chih-Ying Huang, Lucas Wang, Chia-Chun Chen, Ching-Hwa Ho, Ya-Ping Chiu, Chun-Wei Chen
Summary: This study demonstrates the presence of internal built-in electric fields (BIEFs) in 2D organic-inorganic hybrid Ruddlesden-Popper perovskites (OIRPPs). The strength of these BIEFs reduces with increased quantum well width. The origin of these BIEFs is attributed to molecular dipoles pointing to the organic-inorganic interfaces. This discovery provides deep insight into understanding the optical properties of 2D OIRPPs for the future design of large-area and low-cost perovskite optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Yih-Ren Chang, Tomonori Nishimura, Takashi Taniguchi, Kenji Watanabe, Kosuke Nagashio
Summary: This research addresses the deterioration in performance of SnS p-type FETs caused by surface oxidation, and achieves a record-high field effect mobility through surface oxide conversion using highly reactive Ti.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Hao-Yu Chen, Hung-Chang Hsu, Chuan-Chun Huang, Ming-Yang Li, Lain-Jong Li, Ya-Ping Chiu
Summary: This study utilizes light-modulated scanning tunneling microscopy and quasiparticle interference technique to reveal the unexplored momentum-forbidden electronic quantum states in transition metal dichalcogenide monolayers. The results highlight the large spin-splitting energy and the band renormalization dependent on photoexcited carrier density, emphasizing the importance of excited-state distribution in band renormalization.
Article
Chemistry, Multidisciplinary
Chih-Yi Cheng, Wei-Liang Pai, Yi-Hsun Chen, Naomi Tabudlong Paylaga, Pin-Yun Wu, Chun-Wei Chen, Chi-Te Liang, Fang-Cheng Chou, Raman Sankar, Michael S. Fuhrer, Shao-Yu Chen, Wei-Hua Wang
Summary: This study investigates the intersystem Coulomb interactions in IL-functionalized InSe field-effect transistors through displacement current measurements. The research uncovers a strong self-gating effect and reveals the IL-phase-dependent transport characteristics. Raman spectroscopy confirms the dominance of self-gating caused by the correlation between the intra- and intersystem Coulomb interactions. This study is significant for understanding the capacitive coupling at the InSe/IL interface.
Article
Multidisciplinary Sciences
Jing-Kai Huang, Yi Wan, Junjie Shi, Ji Zhang, Zeheng Wang, Wenxuan Wang, Ni Yang, Yang Liu, Chun-Ho Lin, Xinwei Guan, Long Hu, Zi-Liang Yang, Bo-Chao Huang, Ya-Ping Chiu, Jack Yang, Vincent Tung, Danyang Wang, Kourosh Kalantar-Zadeh, Tom Wu, Xiaotao Zu, Liang Qiao, Lain-Jong Li, Sean Li
Summary: The scaling of silicon metal-oxide-semiconductor field-effect transistors has been successful, but with the thinning of silicon at smaller technology nodes, new challenges arise. In this study, researchers explore the use of ultrahigh-kappa single-crystalline perovskite strontium-titanium-oxide membranes as gate dielectrics for 2D field-effect transistors. These membranes have desirable properties and can mitigate the issues related to using ultrahigh-kappa dielectrics.
Review
Chemistry, Physical
Bo-Chao Huang, Chun-Chih Hsu, Ying-Hao Chu, Ya-Ping Chiu
Summary: Complex oxides, oxide heterointerfaces, and layered cuprates show rich functionalities and diverse electronic structures, which can be tuned through precise growth techniques.
PROGRESS IN SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Cheng-Chieh Lin, Jia-Ying Li, Nian-Zu She, Shao-Ku Huang, Chih-Ying Huang, I-Ta Wang, Fu-Li Tsai, Chuan-Yu Wei, Ting-Yi Lee, Di-Yan Wang, Cheng-Yen Wen, Shao-Sian Li, Atsushi Yabushita, Chih-Wei Luo, Chia-Chun Chen, Chun-Wei Chen
Summary: In this study, stable phase-pure high-membered 2D inorganic Ruddlesden-Popper perovskite (IRPP) nanosheets were successfully synthesized, exhibiting a strong quantum confinement effect with tunable absorption and emission. These materials show superior structural and optical stability, making them a promising candidate as photocatalysts in CO2 reduction reactions.
Article
Chemistry, Multidisciplinary
Swathi M. Gowdru, Jou-Chun Lin, Szu-Tan Wang, Yi-Chia Chen, Kuan-Chang Wu, Cheng-Nan Jiang, Yu-Dian Chen, Shao-Sian Li, Yuan Jay Chang, Di-Yan Wang
Summary: Lewis base urea was used as an effective additive to facilitate the formation of 2D RP perovskite thin films with larger grain size and high crystallinity.
Article
Multidisciplinary Sciences
Yi Wan, En Li, Zhihao Yu, Jing-Kai Huang, Ming-Yang Li, Ang-Sheng Chou, Yi-Te Lee, Chien-Ju Lee, Hung-Chang Hsu, Qin Zhan, Areej Aljarb, Jui-Han Fu, Shao-Pin Chiu, Xinran Wang, Juhn-Jong Lin, Ya-Ping Chiu, Wen-Hao Chang, Han Wang, Yumeng Shi, Nian Lin, Yingchun Cheng, Vincent Tung, Lain-Jong Li
Summary: Two-dimensional semiconducting monolayers, such as transition metal dichalcogenides (TMDs), have great potential as channel materials in advanced electronics. Innovative growth reactions using hydroxide W species as a metal precursor show significantly lower defect density compared to conventional chemical vapor deposition (CVD) methods. Field-effect transistor (FET) devices based on this growth method exhibit high electron mobility and on-state current, comparable to exfoliated flakes, indicating the industrial potential of 2D materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jingtao Li, Yang Ma, Yufo Li, Shao-Sian Li, Boxing An, Jingjie Li, Jiangong Cheng, Wei Gong, Yongzhe Zhang
Summary: The ultrathin feature of two-dimensional transition metal dichalcogenides (TMDs) brings special performance in electronic and optoelectronic fields. The synthesis of lateral heterojunctions with clean and sharp interfaces is still a challenge. In this study, a simple chemical vapor deposition (CVD) method is proposed to effectively separate the growth process of different TMDs, resulting in good regulation of the composition change at the junction region. The obtained MoS2-WS2 lateral heterojunctions exhibit better photoelectric performance than those with graded junctions.
Article
Chemistry, Analytical
Shu-Cheng Lo, Shao-Sian Li, Wen-Fai Yang, Kuang-Chong Wu, Pei-Kuen Wei, Horn-Jiunn Sheen, Yu-Jui Fan
Summary: This paper presents a new micro/nanostructure co-hot embossing technique for the integration of gold-capped nanostructures as localized surface plasmon resonance (SPR) sensors into a microfluidic channel. The advantage of this technique is that it eliminates the need for alignment between the SPR sensors and the microfluidic channel during bonding. The integrated SPR sensor and microfluidic channel were characterized, and the sensitivity of the SPR sensor to refractive index was determined using different concentrations of glycerol solutions. The SPR sensor was also used for quantifying latent membrane protein (LMP-1) by modifying anti-LMP-1 on its surface, and a calibration curve was created using different concentrations of LMP-1 samples.
Article
Chemistry, Multidisciplinary
Jun-Ru Chang, Po-Hsun Ho, Chun-Hsiang Chen, Chun-Hao Chiang, Cheng-Hung Hou, Min-Chuan Shih, Hung-Chang Hsu, Wen-Hao Chang, Jing-Jong Shyue, Ya-Ping Chiu, Chun-Wei Chen
Summary: The researchers developed a reliable method for contact doping in 2D electronics, which effectively reduces contact resistance. Through a two-step doping process, strong and hysteresis-free doping was achieved, suitable for the commonly used transition-metal dichalcogenides. The method resulted in a record-high sheet conductance and carrier concentration in monolayer MoS2 devices.
Article
Materials Science, Multidisciplinary
Redhwan Moqbel, Yih-Ren Chang, Zi-Yi Li, Sheng-Hsun Kung, Hao-Yu Cheng, Chi-Cheng Lee, Kosuke Nagashio, Kung-Hsuan Lin
Summary: In this work, the layered structure and ferroelectric properties of SnS were investigated experimentally and theoretically. Polarization-resolved second harmonic generation microscopy was used to study SnS few layers on mica substrates, and significant variations in SHG polar patterns were observed in the range of 800 nm to 1000 nm. Theoretical calculations were consistent with experimental results. This work is important for understanding the ferroelectric properties of SnS and the transition of different ferroic phases.
Article
Chemistry, Physical
Thi-Thong Ho, Zi-Liang Yang, Fang-Yu Fu, Efat Jokar, Hung-Chang Hsu, Pei-Chi Liu, Shaham Quadir, Cheng-Ying Chen, Ya-Ping Chiu, Chih- Wu, Kuei-Hsien Chen, Li-Chyong Chen
Summary: This study investigates the effect of eco-friendly Zn1-xSnxOy (ZTO) films, grown by atomic layer deposition, on the performance of thin-film solar cells. The results show that by controlling the Zn-to-Sn ratio in the ZTO films, the band alignment at the heterojunction can be optimized, leading to improved power conversion efficiency (PCE) and open-circuit voltage (Voc). The ZTO-based solar cells also show a reduction in charge recombination and higher photocurrent compared to CdS-based cells.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lars Freter, Hung -Chang Hsu, Raman Sankar, Chun -Wei Chen, Rafal E. Dunin-Borkowski, Philipp Ebert, Ya-Ping Chiu, Michael Schnedler
Summary: We observed a hysteresis in tunneling spectra of cleaved MA-Br terminated (001) surfaces of MAPbBr(3) single crystals at 4.3 K. Simulations of the tunneling spectra revealed an underlying polarization-voltage hysteresis, which resulted from the rotation and alignment of MA molecules induced by subsurface fields and stabilized by dipole-dipole interactions, as well as the ion-lattice relaxation. The compensating surface polarization was detected by surface-sensitive tunneling spectroscopy.
PHYSICAL REVIEW MATERIALS
(2023)
