Article
Materials Science, Multidisciplinary
Chih-Wei Huang, Ting-An Lin, Wei-Kai Lee, Chen-Han Lu, Tanmay Chatterjee, Chin-Hui Chou, Ken-Tsung Wong, Chung-Chih Wu
Summary: This study reports the development of efficient single-emitting-layer white OLEDs using blue and orange-red emitters, along with a systematic and quantitative optical simulation approach. It takes into account factors such as ratios of excitons formed on different emitters, optical effects on emission of different emitters, and emission characteristics of different emitters.
ORGANIC ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Ju Zhang, Xuanchang Xing, Dongmin Qian, Airu Wang, Lianghui Gu, Zhiyuan Kuang, Jingmin Wang, Hao Zhang, Kaichuan Wen, Wenjie Xu, Meiling Niu, Xuerong Du, Lingzhi Yuan, Chensi Cao, Yu Cao, Lin Zhu, Nana Wang, Chang Yi, Wei Huang, Jianpu Wang
Summary: In this study, perovskite composite films for high performance PeLEDs were developed using zwitterion 3-aminopropanesulfonic acid (APS) as an additive. The sulfonic group of APS can passivate deep and shallow level defects in perovskites via coordinate and hydrogen bonding, leading to improved stability and efficiency of the perovskite composite films.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Optics
Zhe Zhuang, Daisuke Iida, Martin Velazquez-Rizo, Kazuhiro Ohkawa
Summary: The study introduced a method for fabricating ultra-small InGaN μLEDs, successfully realizing different shapes of green μLEDs. It was found that as the size of the μLED decreases, the series resistance and turn-on voltage increase, while the light output power density and external quantum efficiency also improve.
Article
Engineering, Electrical & Electronic
Wei Zhong, Liangyun Kang, Sunbin Deng, Lei Lu, Ruohe Yao, Linfeng Lan, Hoi Sing Kwok, Rongsheng Chen
Summary: The study found that ITZO thin-film transistors with a scandium oxide (Sc2O3) passivation layer showed excellent electrical performance and stability, especially under negative bias temperature stress and positive bias temperature stress. In contrast, devices with an aluminum oxide (Al2O3) passivation layer exhibited poorer stability.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Yunxing Fu, Dezhong Zhang, Hongmei Zhan, Chenyang Zhao, Yanxiang Cheng, Chuanjiang Qin, Lixiang Wang
Summary: The postannealing process is crucial for promoting the composition transfer of quantum wells in quasi-2D perovskites, with extended annealing time leading to a decrease in EQE but an improvement in working stability. Introducing TPTA to passivate emitting-region defects effectively eliminates the annealing-time dependence of EQE, resulting in simultaneous enhancement of efficiency and stability.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yu Xia, Yon-Hui Lou, Yu-Hang Zhou, Yi-Ran Shi, Kai-Li Wang, Lei Cai, Chun-Hao Chen, Fan Hu, Zhao-Kui Wang, Liang-Sheng Liao
Summary: A novel defect-passivation strategy using isocyanate molecules is proposed to fabricate efficient sky-blue PeLEDs. The strategy reduces nonradiative recombination loss and improves carrier injection and transport capacities by reducing the confinement effect. The prepared sky-blue PeLEDs show significantly improved external quantum efficiency, and the isocyanate-based passivators are shown to be universal for improving PeLEDs performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Le Ma, Boning Han, Fengjuan Zhang, Leimeng Xu, Tao Fang, Shalong Wang, Jizhong Song
Summary: This review focuses on the application of metal halide perovskites in light-emitting diodes, discussing the types of defects affecting their efficiency and suppression strategies, as well as looking forward to future directions.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Anna S. Miroshnichenko, Konstantin Deriabin, Maria Baeva, Fedor M. Kochetkov, Vladimir Neplokh, Vladimir V. Fedorov, Alexey M. Mozharov, Olga Yu Koval, Dmitry Krasnikov, Vlad A. Sharov, Nikita A. Filatov, Dmitry S. Gets, Albert G. Nasibulin, Sergey Makarov, Ivan S. Mukhin, Vadim Yu Kukushkin, Regina M. Islamova
Summary: The combination of transparent and durable silicone rubbers with semiconductor materials has enabled the design of highly flexible LEDs. By developing electrodes based on composite materials and nanowires, a novel platform for fabrication of flexible optoelectronic devices has been proposed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Ying Li, Xianfa Zhang, Yi Man, Shiwei Xu, Jing Zhang, Guangming Zhang, Shuo Chen, Chunbo Duan, Chunmiao Han, Hui Xu
Summary: The key factor limiting optoelectronic performances of organic-inorganic hybrid systems, which is defect, has been overcome through interfacial passivation by electron transporting layers (ETL). By using TmPyPB as ETL, the photoluminescence (PL) and electroluminescence (EL) quantum efficiencies of monophosphine Cu4I4 cube [TPP](4)Cu4I4 are significantly improved, resulting in a huge increase in luminance from nearly unlighted state to highly bright state. The passivation effect of TmPyPB on surface defects of cluster layer is manifested in the prevention of interfacial charge trapping and suppression of exciton nonradiation.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chengzhao Luo, Zhishuai Zheng, Yanhui Ding, Zhenwei Ren, Hengfei Shi, Huifeng Ji, Xin Zhou, Yu Chen
Summary: In this study, a strategy of electrostatic force-induced deposition (EF-ID) is proposed to improve the pixel accuracy and transmittance of quantum dot light-emitting diodes (QLEDs). By introducing alternating polyethyleneimine (PEI) and fluorosilane patterns, the resolution and transparency of QD patterns are synergistically improved. High-performance QLEDs with high resolution and efficiency, as well as transparent QLEDs with the highest transmittance, are achieved.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kai Sun, Zhiqiang Bao, Xiaoyang Guo, Deyue Zou, Ying Lv, Jingqiu Liang, Xingyuan Liu
Summary: This study proposes a flexible perovskite light-emitting diode (PeLED) based on a novel transparent electrode and a polymer adjustment method. By regulating crystallization and passivating defects, a highly efficient flexible PeLED is achieved, providing a feasible strategy for the design and manufacture of high-performance flexible PeLEDs.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Yuwei Guo, Sofia Apergi, Nan Li, Mengyu Chen, Chunyang Yin, Zhongcheng Yuan, Feng Gao, Fangyan Xie, Geert Brocks, Shuxia Tao, Ni Zhao
Summary: Researchers investigate how the use of ammonium passivation molecules with different alkyl chain lengths can enhance device stability by suppressing iodide ion migration through steric hindrance and Coulomb interactions, thereby improving the performance of perovskite light emitting diodes.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Kyunghan Ahn, Ga Hye Kim, Se-Jun Kim, Jihyun Kim, Gi-Seong Ryu, Paul Lee, Byungki Ryu, Jung Young Cho, Yong-Hoon Kim, Joohoon Kang, Hyungjun Kim, Yong-Young Noh, Myung-Gil Kim
Summary: This study reports the synthesis of highly conductive transparent p-type sulfur-doped CuI (CuI:S) thin film using a liquid-iodination method with a thiol additive. The CuI:S film exhibits a remarkably high electrical conductivity and optical transmittance, achieving a record-high figure of merit (FOM) value. The CuI:S electrode is successfully utilized in transparent electronic devices.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Baisheng Zhu, Tian Wang, Zhi-Kuang Tan
Summary: This study reports a unique formation of quantum-confined perovskite through a one-step solution-casting process. The resulting thin films enable precise spectral tuning in pure-bromide and pure-iodide perovskite, giving high-purity blue and red luminescence, respectively.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Chan-Hwi Kim, Yu Jung Park, Jung Hwa Seo, Han-Ki Kim
Summary: This study investigates the characteristics of barium-addition indium-zinc-tin-oxide (B-IZTO) channels and their applications in thin film transistors (TFTs) and light emitting transistors (LETs). The addition of barium effectively suppresses oxygen vacancies in the channels, leading to improved stability in TFTs and enhanced performance in LETs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Andre Mayer, Neda Pourdavoud, Zineb Doukkali, Kai Brinkmann, Johannes Rond, Johannes Staabs, Ann-Christin Swertz, Frederic van gen Hassend, Patrick Goerrn, Thomas Riedl, Hella-Christin Scheer
Summary: This study aims to improve methylammonium lead bromide layers using thermal imprinting technique, resulting in larger grain size and reduced side-product content. Experimental results show that post-processing can achieve high-quality perovskite layers with large grains, which is crucial for device manufacturing.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Emilio Gutierrez-Partida, Hannes Hempel, Sebastian Caicedo-Davila, Meysam Raoufi, Francisco Pena-Camargo, Max Grischek, Rene Gunder, Jonas Diekmann, Pietro Caprioglio, Kai O. Brinkmann, Hans Koebler, Steve Albrecht, Thomas Riedl, Antonio Abate, Daniel Abou-Ras, Thomas Unold, Dieter Neher, Martin Stolterfoht
Summary: Recent advancements in perovskite solar cell research have focused on improving efficiency and stability by developing high-quality double cation perovskite materials. The low-bandgap cells exhibited high fill factor and short-circuit current, showcasing reduced charge transport losses. The implied efficiency in the neat material reached 28.4% through minimizing interfacial recombination and optical losses.
ACS ENERGY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Tobias Gahlmann, Tobias Tschorn, Timo Maschwitz, Leonie Gomell, Tobias Haeger, Georg Groetsch, Ralf Heiderhoff, Thomas Riedl
Summary: The study introduces a novel three-terminal device architecture for color tunability of ACEL devices. By independently operating two ACEL devices (e.g., orange and blue), color tunability is achieved, and the use of silver nanowire networks in the electrodes endows the device with bifacial emission capability. The detailed analysis of optical losses in single and tandem ACEL devices suggests novel applications in signage and lighting.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Andre Mayer, Tobias Haeger, Manuel Runkel, Johannes Rond, Johannes Staabs, Frederic van Gen Hassend, Arne Roettger, Patrick Goerrn, Thomas Riedl, Hella-Christin Scheer
Summary: The quality and stability of devices made from polycrystalline layers of organic-inorganic perovskites depend on grain sizes. Thermal imprint as a post-processing step can induce grain growth and provide a flat surface. In MAPbBr(3) layers, imprinting at temperatures above 120°C is recommended for grain growth, with temperature being the main parameter affecting the process.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Energy & Fuels
Kai Oliver Brinkmann, Tim Becker, Florian Zimmermann, Cedric Kreusel, Tobias Gahlmann, Tobias Haeger, Thomas Riedl
Summary: This paper analyzes and explains the root cause of the high EQE values, finding that the high refractive index of the perovskite absorber and the optical properties of the transparent electrode strongly affect the transmittance of light and the spectral position of the peak.
Article
Materials Science, Multidisciplinary
Leonie Gomell, Tobias Haeger, Moritz Roscher, Hanna Bishara, Ralf Heiderhoff, Thomas Riedl, Christina Scheu, Baptiste Gault
Summary: The microstructure of a material plays an important role in its thermoelectric performance. In this study, the researchers investigated the microstructure and local properties of the Heusler-Fe2VAl compound using advanced microscopy techniques. They found that laser surface remelting can be used to manipulate the microstructure, leading to improved thermoelectric performance at room temperature.
Article
Nanoscience & Nanotechnology
Lukas Schmidt-Mende, Vladimir Dyakonov, Selina Olthof, Feray uenlue, Khan Moritz Trong Le, Sanjay Mathur, Andrei D. Karabanov, Doru C. Lupascu, Laura M. Herz, Alexander Hinderhofer, Frank Schreiber, Alexey Chernikov, David A. Egger, Oleksandra Shargaieva, Caterina Cocchi, Eva Unger, Michael Saliba, Mahdi Malekshahi Byranvand, Martin Kroll, Frederik Nehm, Karl Leo, Alex Redinger, Julian Hoecker, Thomas Kirchartz, Jonathan Warby, Emilio Gutierrez-Partida, Dieter Neher, Martin Stolterfoht, Uli Wuerfel, Moritz Unmuessig, Jan Herterich, Clemens Baretzky, John Mohanraj, Mukundan Thelakkat, Clement Maheu, Wolfram Jaegermann, Thomas Mayer, Janek Rieger, Thomas Fauster, Daniel Niesner, Fengjiu Yang, Steve Albrecht, Thomas Riedl, Azhar Fakharuddin, Maria Vasilopoulou, Yana Vaynzof, Davide Moia, Joachim Maier, Marius Franckevicius, Vidmantas Gulbinas, Ross A. Kerner, Lianfeng Zhao, Barry P. Rand, Nadja Glueck, Thomas Bein, Fabio Matteocci, Luigi Angelo Castriotta, Aldo Di Carlo, Matthias Scheffler, Claudia Draxl
Summary: Metal halide perovskites are a new type of solution processed semiconductors that can compete with traditional semiconductors in functionality, especially in optoelectronic devices. Despite breakthroughs, challenges remain in terms of stability, reproducibility, and toxicity.
Article
Materials Science, Multidisciplinary
A. Mayer, T. Haeger, M. Runkel, J. Staabs, J. Rond, F. van Gen Hassend, P. Goerrn, T. Riedl, H-C Scheer
Summary: Promising new materials like solution-processable perovskites may provide devices with superior properties. This study focuses on the organic-inorganic perovskite methylammonium lead bromide (MAPbBr(3)) and investigates its imprinting process. The results show that starting with a large-grained layer is optimal for replicating micro/nano-structures. Analogies with thermoplastic polymers are used to understand the shaping process of polycrystalline perovskites, and it is discovered that grain size and shape can be controlled by the imprinted pattern.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Ivan Shutsko, Maximilian Buchmueller, Maik Meudt, Patrick Goerrn
Summary: Optical metasurfaces offer precise control of light properties at the nanoscale and can be implemented using a solution-based growth method with silver nanoparticles. This approach allows for direct application in optical systems without the need for post-processing.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ivan Shutsko, Maximilian Buchmueller, Maik Meudt, Patrick Goerrn
Summary: Disordered hyperuniformity (DHU) is a significant manifestation of engineered disorder aiming to overcome limitations related to order. A novel and facile method for the fabrication of DHU metasurfaces is proposed, which allows for in-situ control of the k-space by illuminating the growing metasurface with light. The experimental confirmation of anisotropic stealthy DHU is achieved through light-controlled growth.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Editorial Material
Nanoscience & Nanotechnology
Peter Muller-Buschbaum, Thomas Riedl
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Tim Hasselmann, Bujamin Misimi, Nils Boysen, David Zanders, Jan-Lucas Wree, Detlef Rogalla, Tobias Haeger, Florian Zimmermann, Kai Oliver Brinkmann, Sebastian Schaedler, Detlef Theirich, Ralf Heiderhoff, Anjana Devi, Thomas Riedl
Summary: In this study, highly conductive silver films were successfully grown at low temperatures using plasma-enhanced spatial ALD with a newly introduced nitrogen-based silver precursor. These silver films, used as bottom electrodes in organic solar cells, showed comparable performance to those made by traditional high-temperature vacuum processes.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Jarla Thiesbrummel, Francisco Pena-Camargo, Kai Oliver Brinkmann, Emilio Gutierrez-Partida, Fengjiu Yang, Jonathan Warby, Steve Albrecht, Dieter Neher, Thomas Riedl, Henry J. Snaith, Martin Stolterfoht, Felix Lang
Summary: Understanding the performance losses in all-perovskite tandem photovoltaics is crucial for advancing toward commercialization. This study characterizes the individual sub-cells in all-perovskite tandem stacks and shows that non-radiative losses dominate the overall recombination. Through various approaches, the open-circuit voltage of the high-gap perovskite subcell is enhanced, leading to improved efficiency in all-perovskite tandem solar cells.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Charles Otieno Ogolla, Yannik Loth, Tobias Haeger, Cedric Kreusel, Manuel Runkel, Thomas Riedl, Benjamin Butz, Anna Katharina Wigger, Stephan Schaeffer, Peter Haring Bolivar
Summary: In this study, THz-sSNOM was used for nanoscale imaging of CsPbBr3 thin films, and the local THz nanoscale conductivity was derived using a scattering model. The analysis of the obtained signals confirmed the presence of halide vacancies (VBr) and Pb-Pb bonds at the CsPbBr3 grain boundaries, which resulted in charge carrier trapping and nonradiative recombination. This study establishes THz-sSNOM as a powerful analysis platform for thin-film semiconductors like LHPs.
Article
Computer Science, Information Systems
Utpal Kalita, Christian Tueckmantel, Thomas Riedl, Ullrich R. Pfeiffer
Summary: This paper presents a multi-finger doubler based on amorphous-indium gallium zinc oxide (a-IGZO) thin film transistors (TFT) operating at GHz frequency. The doubler and the TFTs have been fabricated in-house with chromium (Cr) gate electrodes. The device output power, the threshold voltage mismatch, and breakdown characteristics are explained with the help of the model. The peak second harmonic conversion gain of the doubler is measured to be -32 dB at a gate overdrive voltage of around 2.8 V for a 500 MHz input signal. This second harmonic output frequency exceeds the TFT's transit and maximum oscillation frequencies.
