Article
Chemistry, Physical
Shaobing Xiong, Sheng Jiang, Yefan Zhang, Zhiwei Lv, Ruirong Bai, Yuting Yan, Qi Zeng, Xionghu Xu, Liming Ding, Yuning Wu, Xianjie Liu, Mats Fahlman, Qinye Bao
Summary: The study systematically investigates the energetics and chemical reactions at the buried heterointerfaces of perovskite optoelectronic devices. It discovers a perovskite transition phase at the buried interface region that causes an energy level barrier and induces defects, leading to decreased device photovoltage. By inserting a thin polyvinyl alcohol layer, the chemical interactions and formation of the transition phase are restrained, improving charge transport and increasing the open-circuit voltage and fill factor of the devices.
Review
Chemistry, Physical
Like Huang, Ziyi Ge, Xiaoli Zhang, Yuejin Zhu
Summary: Solution-processed metal halide perovskite (MHP) semiconductors have shown remarkable success in optoelectronic device applications, with higher photoluminescence quantum yield (PLQY) implying a reduction of nonradiative deactivation pathways. Recent studies have found a significant enhancement in PLQY when MHPs are exposed to dry air or oxygen, indicating oxygen-induced defect-healing.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Engineering, Environmental
Thanh-Hai Le, Sanghyuck Lee, Eunseo Heo, Unhan Lee, Haney Lee, Hyemi Jo, Kap Seung Yang, Mincheol Chang, Hyeonseok Yoon
Summary: Cubic-phase layered perovskite nanocrystals (PNCs) of various shapes were synthesized and their photoresponse characteristics were investigated in a phototransistor device. It was found that nanocubes exhibited the highest photosensitivity and longest radiative lifetime, showing potential for high-performance phototransistors. Further research into the intrinsic photophysical properties of PNCs based on their morphology is warranted.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Xiaoling Jing, Donglei Zhou, Rui Sun, Yu Zhang, Yanchun Li, Xiaodong Li, Quanjun Li, Hongwei Song, Bingbing Liu
Summary: This study reports the unique optical and electrical properties of Eu3+-doped CsPbCl3 QDs under high pressure, showing an enhancement of the PL of Eu3+ ions up to 10.1 GPa and preserving a relatively high intensity at 22 GPa. The pressure-induced PL enhancement of Eu3+ ions is associated with the enhanced energy transfer rate from excitonic state to Eu3+ ions. The compression-induced enhancement of photoelectric performance can be attributed to decreased defect density and increased carrier mobility.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Lifu Zhang, Jie Jiang, Yang Hu, Zonghuan Lu, Xixing Wen, Saloni Pendse, Ru Jia, Gwo-Ching Wang, Toh-Ming Lu, Jian Shi
Summary: This study demonstrates the liquid-phase van der Waals epitaxy of a 2D Ruddlesden-Popper (RP) hybrid perovskite and its integration with another 2D RP perovskite, resulting in the formation of perovskite-perovskite vertical heterostructures. The interlayer photo emission observed in this heterostructure enriches our understanding of interlayer charge transition in halide perovskites.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Wenda Yang, Qiqi Qin, Sujuan Wu, Jinwei Gao, Guo Tian, Zhipeng Hou, Zhen Fan, Xubing Lu, Deyang Chen, Xingsen Gao, Jun-Ming Liu
Summary: Using pcAFMs, this study investigated the microscopic mechanisms underlying photovoltaic degradation in MAPbI(3)-based solar cells, revealing two distinct evolution stages and major decomposition mechanisms. These findings could help improve the performance of halide perovskite solar cells and serve as a paradigmatic example for probing microscopic photovoltaic mechanisms.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Colin Tyznik, James Lee, Jeni Sorli, Xiaojie Liu, Emma K. Holland, Cynthia S. Day, John E. Anthony, Yueh-Lin Loo, Z. Valy Vardeny, Oana D. Jurchescu
Summary: The study shows that by adjusting the microstructure of the electronically active layers at the interface of hybrid organic-inorganic metal-halide perovskites and organic semiconductors, the photocurrent response can be significantly enhanced, leading to improved performance of photodetectors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Dong Yang, Yujuan Weng, Zhitao Shen, Mengqi Jin, Hu Shen, Qing Du, Jihong Zheng, Fumin Li, Chong Chen
Summary: A novel In(SCN2H4)3Cl3 complex diffusion doping strategy was proposed to address the defects and band alignment issues at the interface of perovskite and hole transport layer (HTL) in inverted perovskite solar cells (PSCs). The In(SCN2H4)3Cl3 effectively passivates the defects in the perovskite layer and promotes charge separation and transport properties in PSCs. The optimized inverted PSCs with CH3NH3PbI3:In(SCN2H4)3Cl3 layer achieve a high efficiency of 21.25% and improved long-term stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yan Zhu, Thorsten Trupke, Ziv Hameiri
Summary: This study introduces a dynamic calibration method for injection-dependent carrier lifetime measurements, which compares lifetime measurements under quasi-steady-state and non-quasi-steady-state conditions to achieve precise calibration of experimental data and provide the net bulk doping concentration.
Article
Chemistry, Multidisciplinary
Aleksander M. Ulatowski, Karim A. Elmestekawy, Jay B. Patel, Nakita K. Noel, Siyu Yan, Hans Kraus, Peter G. Huggard, Michael B. Johnston, Laura M. Herz
Summary: Metal-halide perovskites are versatile semiconductors for optoelectronic applications, but changes in composition can affect charge-carrier transport and recombination mechanisms. This study presents a novel technique to investigate these processes across a wide temperature range. The results show that the charge-carrier dynamics in different perovskite compositions are influenced by various factors, such as radiative processes, energetic disorder, and non-radiative processes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Mirella Al Katrib, Emilie Planes, Lara Perrin
Summary: Electrodeposition was explored as an alternative technique for elaborating large-scale and homogeneous perovskite layers for photovoltaic application. The innovative electrodeposited mixed perovskites showed excellent performances in solar cell devices, with enhanced efficiency and stability. The addition of Cl in the lattice not only limits the formation of by-products but also largely increases the stability of the perovskites.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Applied
Xiaoxia Zhao, Zhiyong Wang, Wenming Tian, Xianchang Yan, Yantao Shi, Yudi Wang, Zhonggao Sun, Shengye Jin
Summary: Developing an interplay between the local morphological character and its local photovoltaic (PV) parameters in a perovskite thin film is crucial for guiding the construction of highly-efficient perovskite solar cells (PSCs). The study finds that larger perovskite grains often have fewer defects and better charge collection efficiency, with the optimum grain size being >2 micrometers.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Zhenyu Ouyang, Ninghao Zhou, Meredith G. McNamee, Liang Yan, Olivia F. Williams, Zijian Gan, Ran Gao, Wei You, Andrew M. Moran
Summary: Mixtures of layered perovskite quantum wells with different sizes form light-harvesting antenna structures, but carrier trapping at interfaces between quantum wells and interstitial organic spacer molecules hinders long-range charge transport. Experimental results indicate an increase in trap-induced carrier deceleration with the concentrations of organic spacer cations.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Tobias Leonhard, Holger Roehm, Fabian J. Altermann, Michael J. Hoffmann, Alexander Colsmann
Summary: This study investigates the evolution of ferroelectric domains and their polarization orientation in MAPbI(3) thin films during thermal annealing using piezoresponse force microscopy and Kelvin probe force microscopy. It reveals that different ferroelectric polarization orientations have a significant impact on the performance of perovskite solar cells.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Angelica Simbula, Riccardo Pau, Fang Liu, Luyan Wu, Stefano Lai, Alessandra Geddo-Lehmann, Alessio Filippetti, Maria A. Loi, Daniela Marongiu, Francesco Quochi, Michele Saba, Andrea Mura, Giovanni Bongiovanni
Summary: In this work, an ultrafast radiometric experiment is introduced to directly assess the radiative decay rate in perovskite thin films through a calibrated measurement of the instantaneous photoluminescence flux under pulsed laser excitation. The measured radiative decay rate is found to be significantly lower than expected and is attributed to the formation of a population of dark excitations, specifically large polarons. These results provide insights into the radiative and non-radiative carrier recombination processes in metal halide perovskites, as well as the photophysical basis to optimize device performances in this emerging class of semiconductors.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Taketo Handa, Petra Shih, Christie S. Koay, Colin Nuckolls, Xavier Roy, Timothy C. Berkelbach, Xiaoyang Zhu
Summary: We report the in-plane anisotropy in the electronic and optical properties of the two-dimensional superatomic semiconductor CsRe6Se8I3. CsRe6Se8I3 exhibits linearly polarized photoluminescence at room temperature, consistent with the structural anisotropy within the 2D plane. Lowering the temperature reveals a new photoluminescence peak with nearly orthogonal linear polarization, without a structural phase transition. Theoretical calculations and spectroscopic measurements suggest that the high- and low-temperature photoluminescence peaks originate from direct and indirect excitons, respectively. These results demonstrate the rich optical properties of superatomic solids, which can be precisely programmed through hierarchical design of the constituent clusters and intercluster bonding.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Kotaro Nakagawa, Nobuhisa Ishii, Yoshihiko Kanemitsu, Hideki Hirori
Summary: We generated intense mid-infrared pulses with a tunable wavelength range of 5.3-7.4 μm and a pulse energy of up to 6.2 μJ. This was achieved through white-light generation, intra-pulse difference frequency generation (DFG), and optical parametric amplification. The use of intra-pulse DFG allowed for the generation of carrier-envelope phase (CEP)-stable mid-infrared optical pulses, with a CEP standard deviation of 114 mrad during a 5-hour-long measurement.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Applied
Etsuki Kobiyama, Hirokazu Tahara, Masaki Saruyama, Ryota Sato, Toshiharu Teranishi, Yoshihiko Kanemitsu
Summary: Trion dynamics in quantum dot films were studied using transient photocurrent measurements. The observed transient photocurrent signal has two decay components: a fast trion component with a lifetime shorter than 1 ns and a slow exciton component with several tens of nanoseconds. The amplitude of the fast trion decay component can be controlled by tuning extra charge doping to the quantum dots. These results demonstrate the control of optoelectronic responses of quantum dot films via bias electric voltage and pave the way for QD-based ultrafast optoelectronics.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tiancheng Tan, Tomoya Nakamura, Richard Murdey, Shuaifeng Hu, Minh Anh Truong, Atsushi Wakamiya
Summary: New near-infrared dyes combining BAr2-bridged azafulvene dimer acceptors with diarylaminothienyl donors were synthesized. Surprisingly, the azafulvene acceptor in these dyes adopted a 5-membered ring structure. The influence of aryl substituents on the energy levels of the dye compounds was evaluated through electrochemical and optical measurements.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Kenichi Cho, Takumi Yamada, Masaki Saruyama, Ryota Sato, Toshiharu Teranishi, Yoshihiko Kanemitsu
Summary: In this study, the temperature dependence of the photoluminescence (PL) spectra of perovskite FAPbBr(3) and CsPbBr3 nanoparticles was investigated. The results showed that the PL linewidths were mainly influenced by the Frohlich interaction between excitons and longitudinal optical phonons. A redshift in the PL peak energy was observed between 100 and 150 K for FAPbBr(3) nanoparticles, which was attributed to the orthorhombic-to-tetragonal phase transition. It was also found that the phase transition temperature of FAPbBr(3) nanoparticles decreased as the nanoparticle size decreased.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Taketo Handa, Takumi Yamada, Yoshihiko Kanemitsu
Summary: Photoluminescence spectroscopy is a powerful technique for studying carrier dynamics in semiconducting materials and photovoltaic devices. In this short review, we present our recent investigations on luminescence spectroscopy of halide perovskites, including thin films and solar cell devices, and discuss their photocarrier dynamics in relation to photovoltaic performance.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Noboru Ohashi, Ryuji Kaneko, Chikako Sakai, Yoko Wasai, Seiji Higuchi, Kenji Yazawa, Hirokazu Tahara, Taketo Handa, Tomoya Nakamura, Richard Murdey, Yoshihiko Kanemitsu, Atsushi Wakamiya
Summary: The internal stress of the indium tin oxide (ITO) layer on thin plastic substrates causes deformation of the substrate, limiting the performance of optoelectronic devices. However, using ITO bilayers composed of an amorphous base layer and a crystalline overlayer can eliminate this deformation. By optimizing the bilayer structure and canceling out the internal stresses, mixed composition metal halide perovskite solar cells with ITO electrodes were successfully fabricated on 4 μm polyethylene naphthalate films.
Article
Nanoscience & Nanotechnology
Wentao Liu, Shuaifeng Hu, Jorge Pascual, Kyohei Nakano, Richard Murdey, Keisuke Tajima, Atsushi Wakamiya
Summary: The power conversion efficiency of tin-based halide perovskite solar cells is limited by the energy-level offset between the perovskite and conventional electron transport material. The use of ICBA as an alternative material shows promise due to its better energy level matching with tin-based perovskites. By optimizing the choice of solvent and annealing temperature, ICBA films with improved morphology and electrical properties are fabricated. These films exhibit reduced energy disorder and result in solar cells with high open-circuit voltages and conversion efficiencies. This research highlights the importance of controlling electron transport material properties and demonstrates the potential of solvent engineering for efficient device processing.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Kento Iwai, Yoshiyuki Mizuhata, Tomoya Nakamura, Masato Goto, Atsushi Wakamiya, Yuichi Shimakawa, Norihiro Tokitoh
Summary: Zwitterionic triarylmethylium dyes 1 and 2 with varied molecular assembly and charge transfer transition were synthesized using a tetraarylborate unit. These dyes exhibited solvatochromism and mechanochromism, allowing the color of the solid state to change upon dissolution & evaporation or grinding. Different crystal forms obtained from different recrystallization conditions independently reproduced the three colors, which were correlated with solid-state structures as demonstrated by diffuse reflectance measurement and powder X-ray diffraction. The unique color change of these dyes is suggested to originate from alterations in intermolecular interactions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Chika Higashimura, Go Yumoto, Takumi Yamada, Tomoya Nakamura, Fuyuki Harata, Hideki Hirori, Atsushi Wakamiya, Yoshihiko Kanemitsu
Summary: Two-dimensional halide perovskites exhibit unique structural and optical properties due to the distortion of the perovskite structure by large organic molecular cations, resulting in stable excitons confined in the 2D layers. In this study, the temperature dependences of various properties of a specific 2D perovskite crystal were investigated. The findings suggest that the anomalous temperature dependence of the Urbach tail parameter is caused by a random distribution of spontaneous polarizations in the ferroelectric phase.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
He Zhao, Raymond Blackwell, Morgan Thinel, Taketo Handa, Shigeyuki Ishida, Xiaoyang Zhu, Akira Iyo, Hiroshi Eisaki, Abhay N. Pasupathy, Kazuhiro Fujita
Summary: We have discovered a superconducting state with long-range, unidirectional spatial modulations in the iron pnictide superconductor EuRbFe4As4, indicating that the Cooper pairs carry centre-of-mass momentum in equilibrium and leading to the breaking of translational symmetry. This PDW state exists at zero magnetic field and independent of other spatially ordered states. This finding contributes to a better understanding of the relationship between superconductivity and density waves.
Article
Multidisciplinary Sciences
Shuai Zhang, Yang Liu, Zhiyuan Sun, Xinzhong Chen, Baichang Li, S. L. Moore, Song Liu, Zhiying Wang, S. E. Rossi, Ran Jing, Jordan Fonseca, Birui Yang, Yinming Shao, Chun-Ying Huang, Taketo Handa, Lin Xiong, Matthew Fu, Tsai-Chun Pan, Dorri Halbertal, Xinyi Xu, Wenjun Zheng, P. J. Schuck, A. N. Pasupathy, C. R. Dean, Xiaoyang Zhu, David H. Cobden, Xiaodong Xu, Mengkun Liu, M. M. Fogler, James C. Hone, D. N. Basov
Summary: The discovery of ferroelectricity in twisted van der Waals layers provides new opportunities to engineer spatially dependent electric and optical properties. In this study, near-field infrared nano-imaging and nano-photocurrent measurements were used to investigate ferroelectricity in minimally twisted WSe2. The ferroelectric domains were visualized through the plasmonic response in adjacent graphene monolayers, and it was found that the optoelectronic properties of graphene were modulated by the proximal ferroelectric domains. This approach offers a promising alternative strategy for studying moire ferroelectricity and has implications for (opto)electronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Rei Shimono, Ryosuke Nishikubo, Mikhail Pylnev, Fumitaka Ishiwari, Atsushi Wakamiya, Akinori Saeki
Summary: Understanding the effects of process variables on large-scale manufacturing of lead halide perovskite solar cells is crucial for commercialization. This study compared four bar coating methods and thermal annealing or hot airflow for 2D Ruddlesden-Popper PSCs, finding that the anisotropic charge carrier mobilities were correlated with power conversion efficiency. The best PCE of 12.15% was achieved with a hot air flow after bar coating, and slow film formation was identified as key to optimal performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Takahiro Tsuchiya, Tomohiro Hamano, Masahiro Inoue, Tomoya Nakamura, Atsushi Wakamiya, Yasuhiro Mazaki
Summary: The introduction of diarylamino groups at the 2- and 6-positions of azulene leads to the reversal of the orbital energy levels and enables the HOMO-LUMO transition, resulting in a significant increase in absorbance in the visible region. Furthermore, the stability of their one-electron oxidized species is enhanced by introducing bromine or methoxy groups at the 1- and 3-positions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Taketo Handa, Petra Shih, Christie S. Koay, Colin Nuckolls, Xavier Roy, Timothy C. Berkelbach, Xiaoyang Zhu
Summary: In this study, we achieved polarized light emission by utilizing the tunable structure, symmetry, and functionality of superatomic semiconductors. The two-dimensional superatomic semiconductor CsRe6Se8I3 showed in-plane anisotropy in electronic and optical properties and exhibited linearly polarized photoluminescence at room temperature. By lowering the temperature, a new photoluminescence peak with nearly orthogonal linear polarization was observed without any structural phase transition. Theoretical calculations and spectroscopic measurements indicated that the high- and low-temperature photoluminescence peaks originated from direct and indirect excitons, respectively. These findings demonstrate the rich optical properties of superatomic solids, which can be precisely programmed through hierarchical design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
