Article
Chemistry, Multidisciplinary
Xiao Ma, Haijun Bin, Bas T. T. van Gorkom, Tom P. A. van der Pol, Matthew J. J. Dyson, Christ H. L. Weijtens, Marco Fattori, Stefan C. J. Meskers, Albert J. J. M. van Breemen, Daniel Tordera, Rene A. J. Janssen, Gerwin H. H. Gelinck
Summary: Organic bulk heterojunction photodiodes (OPDs) are attracting attention in sensing and imaging. The detectivity of these OPDs is often limited by a substantial reverse bias dark current density (J(d)). Recent studies have shown that thermal charge generation mediated by mid-gap states is responsible for J(d). The temperature dependence of J(d) in state-of-the-art OPDs is reported in this study, and it is found that the dark current is attributed to thermal charge generation at the donor-acceptor interface mediated by intra-gap states near the band edges.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Oskar Sachnik, Xiao Tan, Dehai Dou, Constantin Haese, Naomi Kinaret, Kun-Han Lin, Denis Andrienko, Martin Baumgarten, Robert Graf, Gert-Jan A. H. Wetzelaer, Jasper J. Michels, Paul W. M. Blom
Summary: A common obstacle in organic semiconductors is the unipolar charge transport caused by trapping of either electrons or holes by extrinsic impurities. In this study, a molecular strategy is proposed to spatially separate the highest occupied and lowest unoccupied molecular orbitals, effectively preventing charge trapping and significantly enhancing charge transport. This strategy opens up possibilities for large band gap organic semiconductors with balanced and trap-free transport.
Article
Materials Science, Multidisciplinary
Long Cheng, Chenmu Zhang, Yuanyue Liu
Summary: This paper reviews the first-principles methods for calculating the intrinsic carrier mobility of 2D semiconductors and the progress in understanding the underlying physical factors governing the mobility. The study provides perspectives on further research directions.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Qi Wei, Ruihong Duan, Qi Zhang, Linghai Xie, Ruidong Xia, Yuanping Yi, Jeremie Leonard, Stefan Haacke, Juan Cabanillas-Gonzalez, Yan Qian, Wei Huang
Summary: By designing compounds with tunable electronic transition characters and studying their vibrational modes using computational calculations and experiments, this study provides guidelines for the rational design of efficient organic laser materials. The results show that the coupling of high wavenumber vibrational modes to pure LE states is essential for optical gain, while broad excited-state absorption overwhelming stimulated emission is favored when HLCT or CT states are coupled to low frequency vibrational modes.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Zhongwu Wang, Yining Ma, Shujing Guo, Liqian Yuan, Yongxu Hu, Yinan Huang, Xiaosong Chen, Deyang Ji, Jinshun Bi, Yong Lei, Cheng Han, Liqiang Li, Wenping Hu
Summary: This work demonstrates photostable organic field-effect transistors (OFETs) by designing the micro-structure of organic semiconductors (OSs) and introducing an electrical double layer at the OS/polyelectrolyte dielectric interface to modulate exciton dynamics. The generation and dissociation of excitons are suppressed due to the small light-absorption area and excellent crystallinity of OSs. Furthermore, a highly efficient exciton quenching process is activated by the electrical double layer, resulting in outstanding tolerance of the OFETs to light irradiation.
Article
Chemistry, Physical
Huipeng Ma, Feng Lin, Shibo Cheng, Jin-Dou Huang
Summary: In this study, the electronic structures and conducting properties of BN-embedded perylene diimides (B2N2-PDIs) were systematically investigated. The substitution of C-C units with B-N units in the pi-electron core was found to significantly affect the reorganization energies, ionization potential, and electron affinity of the PDIs. It was also revealed that B2N2-PDIs have the potential to be developed as high-efficiency n-type organic semiconductor materials. Additionally, the three-dimensional angular resolution anisotropic mobility of 6-CH, 6-EH, and 6-DIPP was simulated for the first time, and their charge carrier-transport properties were characterized.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Materials Science, Multidisciplinary
Seema Morab, Manickam Minakshi Sundaram, Almantas Pivrikas
Summary: Organic semiconductors offer a promising solution to overcome the limitations of inorganic semiconductors by providing low-cost, flexible, and lightweight alternatives. This review provides a thorough overview of charge carrier transport in organic semiconductors, focusing on the underlying physical mechanisms and their impact on device performance. Insights into the fundamental principles governing charge carrier behavior in these materials are also presented.
Article
Materials Science, Multidisciplinary
Wenlan Liu, Naresh B. Kotadiya, Paul W. M. Blom, Gert-Jan A. H. Wetzelaer, Denis Andrienko
Summary: An efficient single-layer organic light-emitting diode with balanced bipolar electron and hole transport has been developed using a diboron-based thermally activated delayed fluorescence emitter. The study shows that the energetic disorder is larger for holes than for electrons, leading to differences in temperature activation of mobility. However, this imbalance is partly counteracted by larger coupling elements for holes.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Yuhang Liang, Xiangyuan Cui, Feng Li, Catherine Stampfl, Simon P. Ringer, Xudong Yang, Jun Huang, Rongkun Zheng
Summary: Oxygen ingression has been shown to decrease the carrier lifetime of Sn-based perovskites, and our calculations reveal that oxygen tends to form substitutional OI, which remarkably increases the recombination rate of native I vacancies (VI). This explains the observed decline of carrier lifetime in perovskites exposed to air. The enhanced carrier recombination is due to a smaller electron capture barrier of OI, resulting from lattice strengthening and suppressed structural relaxation upon electron capture. These insights offer a route to improve device performance in Sn-based perovskite optoelectronics operating in ambient air.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Juan Wang, Xuejin Zhang, Xiaohan Song, Yingcai Fan, Zhihua Zhang, Mingwen Zhao
Summary: Using first-principles calculations and nonadiabatic molecular dynamics (NAMD), we propose heterostructures of carbon nitride (C7N6) and Janus GaSnPS monolayer as promising direct Z-scheme photocatalysts for solar-driven water splitting. The band alignment and catalytic activity of the heterostructures are altered by the out-of-plane electric field resulting from electric polarization dependent on the stacking pattern. The strong interfacial nonadiabatic coupling and long quantum coherence time enable direct Z-scheme photocatalysis without sacrificial agents.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Rui Cao, Peng Xiao, Weitao Lian, Lijian Zhang, Yan Wang, Changfei Zhu, Tao Chen
Summary: This study uncovers new findings related to energy loss mechanisms in bismuth sulfide nanocrystals, which are caused by their unique crystal structure. It provides fundamental understanding of carrier dynamics in bismuth sulfide nanocrystals and offers insights into the optimization of photovoltaic devices based on bismuth sulfide.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Dandan Pei, Chuanbin An, Bin Zhao, Mengke Ge, Zhongli Wang, Weijia Dong, Cheng Wang, Yunfeng Deng, Dongpo Song, Zhe Ma, Yang Han, Yanhou Geng
Summary: This article reports a stretchable semiconductor PU(DPP)(x) with large elastic recovery and high mechanical performance in thin film state, which shows potential for stretchable electronics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Xiao Ma, Riccardo Ollearo, Bas T. van Gorkom, Christ H. L. Weijtens, Marco Fattori, Stefan C. J. Meskers, Albert J. J. M. van Breemen, Rene A. J. Janssen, Gerwin H. Gelinck
Summary: Trap states in organic semiconductors, particularly in bulk-heterojunction photodiodes, have been investigated using three sensitive techniques. The study reveals that intra-gap states in the polymers, lying above the energy of the highest occupied molecular orbital, are responsible for the reverse-bias dark current density. The results emphasize the importance of reducing the energy and density of these intra-gap states for improving the performance of near-infrared organic photodiodes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Mingyuan Liu, Xingyu Wang, Han Wook Song, Hyeonghun Kim, Michael Clevenger, Dong-Kyun Ko, Kwangsoo No, Sunghwan Lee
Summary: This study investigates the origin of carrier density modulation in InAlZnO (IAZO), finding that the carrier density of IAZO can be significantly increased through low temperature annealing. Additionally, high-pressure oxidation experiments reveal that the equilibrium carrier density of IAZO is much higher than those typically used in TFT channel applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Sangsik Park, Wookjin Choi, Seung Hyun Kim, Hansol Lee, Kilwon Cho
Summary: Despite the improvements in electronic characteristics of organic semiconductors, the low operational stability of organic field-effect transistors (OFETs) limits their practical applications. This study proposes that protonation-induced trap generation in organic semiconductors may be responsible for the operational instability in OFETs. Spectroscopic and electronic investigation techniques suggest that direct protonation of organic semiconductors by water during operation can induce trap generation, independent of insulator surface traps.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Seiji Obata, Koichiro Saiki
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Kenta Morimoto, Seiji Obata, Koichiro Saiki
Article
Physics, Applied
Takanobu Taira, Takuya Shinohara, Seiji Obata, Koichiro Saiki
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Takaaki Taniguchi, Shisheng Li, Leanddas Nurdiwijayanto, Yu Kobayashi, Tetsuki Saito, Yasumitsu Miyata, Seiji Obata, Koichiro Saiki, Hiroyuki Yokoi, Kenji Watanabe, Takashi Taniguchi, Kazuhito Tsukagoshi, Yasuo Ebina, Takayoshi Sasaki, Minoru Osada
Article
Materials Science, Multidisciplinary
Hiroya Abe, Yutaro Hirai, Susumu Ikeda, Yasutaka Matsuo, Haruyuki Matsuyama, Jun Nakamura, Tomokazu Matsue, Hiroshi Yabu
NPG ASIA MATERIALS
(2019)
Article
Multidisciplinary Sciences
Wataru Yashiro, Susumu Ikeda, Yasuo Wada, Kentaro Totsu, Yoshio Suzuki, Akihisa Takeuchi
SCIENTIFIC REPORTS
(2019)
Article
Physics, Applied
Susumu Ikeda
APPLIED PHYSICS EXPRESS
(2020)
Article
Nanoscience & Nanotechnology
Ryo Nouchi, Yoshiaki Ishihara, Susumu Ikeda
Article
Chemistry, Analytical
Gaku Imamura, Kosuke Minami, Kota Shiba, Kissan Mistry, Kevin P. Musselman, Mustafa Yavuz, Genki Yoshikawa, Koichiro Saiki, Seiji Obata
Article
Physics, Applied
Susumu Ikeda
Summary: In this study, molecular dynamics simulations were used to investigate the reorientation mechanism of pentacene molecules during the early stages of thin film growth by physical vapor deposition. The results showed that short-range van der Waals interactions and long-range Coulomb interactions were the main driving forces for molecular reorientation. With increasing temperature, the number of standing molecules on the substrate increased, leading to an increase in the rate of orientational transition.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Susumu Ikeda, Bin Feng, Naoya Shibata, Yuichi Ikuhara
Summary: Atomic arrangements and their influence on oxygen ion diffusion were investigated in yttria-stabilized zirconia (YSZ) using molecular dynamics (MD) simulations. The results showed that the sigma 11 [110]/{113} grain boundary (GB) reduces oxygen ion diffusion across and along the GB, while the sigma 9 [110]/{221} GB has little influence on the diffusion. The difference can be explained by the variation in nearest neighbor O-O distance. MD simulations also predicted the formation of two-dimensional honeycomb-shaped path networks of oxygen ion diffusion along the cores of the sigma 3[110]/{111} GB in YSZ, which has the potential to enhance ion diffusion along GBs.
SOLID STATE IONICS
(2023)
Article
Physics, Applied
Susumu Ikeda
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Energy & Fuels
Mikimasa Katayama, Toshihiko Kaji, Satoru Nakao, Masahiro Hiramoto
FRONTIERS IN ENERGY RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Takuya Shinohara, Seiji Obata, Koichiro Saiki
JOURNAL OF MATERIALS CHEMISTRY C
(2019)
Article
Mineralogy
Susumu Ikeda, Yoshito Nakashima, Tsukasa Nakano
JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES
(2019)
