Qi Sun

Dalian Institute of Chemical Physics

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Shengye Jin

Dalian Institute of Chemical Physics

Wenming Tian

Dalian Institute of Chemical Physics

Chunyi Zhao

Anhui Normal University

Jing Leng

Dalian Institute of Chemical Physics

Shaodong Qin

National Institute of Clean and Low-Carbon Energy

Xinbin Ma

Tianjin University

Xichao Ruan

China Institute of Atomic Energy

Baowei Wang

Huazhong University of Science and Technology

Jie Ren

Beijing Sanbo Brain Hospital

Chun‐Xia Zhao

University of Adelaide

Cooperative Institutions

Chinese Academy of Sciences

208

University of Chinese Academy of Sciences

University of Science and Technology of China

Institute of High Energy Physics

China Spallation Neutron Source

China Institute of Atomic Energy

Dalian Institute of Chemical Physics

China Academy of Engineering Physics

Peking University

Sun Yat-sen University

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Highly Diffusive Nonluminescent Carriers in Hybrid Phase Lead Triiodide Perovskite Nanowires

Angewandte Chemie International Edition (2024)

Wenming Tian Chunyi Zhao Qi Sun Peng Xu Longwen Chen

Abstract Crystal structural rearrangements unavoidably introduce defects into materials, where even these small changes in local lattice structure could arouse a prominent impact on the overall nature of crystals. Contrary to the traditional notion that defects obstruct carrier transport, herein, we report a promoted transport mechanism of nonluminescent carriers in single‐crystalline CH 3 NH 3 PbI 3 nanowires (1345.2 cm 2 V −1 s −1 , about a 14‐fold improvement), enabled by the phase transition induced defects (PTIDs). Carriers captured by PTIDs evade both the radiative and non‐radiative recombinations during the incomplete tetragonal‐to‐orthorhombic phase transition at low temperatures, forming a specific nonluminescent state that exhibits an efficient long‐distance transport and thereby realize a prominent enhancement of photocurrent responsivity for photodetector applications. The findings provide broader insights into the carrier transport mechanism in perovskite semiconductors and have significant implications for their rational design for photoelectronic applications at varied operating temperatures.

Tetragonal crystal system

Orthorhombic crystal system

Photocurrent

10.1002/anie.202411499

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Energy-band gradient structure originated from longitudinal phase segregation of mixed halide perovskite single crystal

Communications Materials (2024)

Zelong Chen Zhiya Dang Yuqing Luo Feng Li Tongtong Lu

Energy-band gradient halide perovskites are highly desired candidates for fabricating high performance optoelectronic devices. Here, we demonstrate that a mixed halide perovskite single crystal undergoes phase segregation in the longitudinal direction under above-bandgap light illumination. As a result, a micron thick layer with vertically gradient halide composition and thus graded valence band edge is generated at the crystal surface. The resultant gradient structure can facilitate the hole extraction at its interface with a hole transport layer. The longitudinal phase segregation of mixed halide perovskite single crystal is likely driven by abundant defects at the surface. Moreover, the segregation rate is increased in air compared to nitrogen probably due to the combined effect of oxygen and moisture. These findings not only deepen the understanding of phase segregation mechanism in mixed halide perovskite, but also indicate a promising avenue of fabricating vertically energy-band gradient perovskite and enhancing the perovskite-based optoelectronic device performance. Energy-band gradient halide perovskites are highly desired candidates for fabricating high performance optoelectronic devices. Here, it is shown that a mixed halide perovskite single crystal undergoes phase segregation in the longitudinal direction under abovebandgap light illumination, generating a micron-thick layer with vertically gradient halide composition and thus graded valence band edge at the crystal surface.

Crystal (programming language)

10.1038/s43246-024-00588-z

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The stoichiometry of soil trace elements plays a critical role in regulating Camellia Oleifera nutrient accumulation and production

Authorea (Authorea) (2023)

Sheng Lü Yu‐Kun Lu Luo Zipei Qi Sun Qin Deng

Understanding the accumulation rule of nutrients is crucial to promote the production of Camellia Oleifera . The stoichiometry of soil microelements is more critical than their content in affecting the growth and yield of plants. However, research on C. Oleifera in these aspects is limited. In this study, we examined microelement content in soil and various parts of the C. oleifera plant and analysed the relationship between the bioaccumulation, distribution, and production of plant trace elements with the stoichiometry of soil trace elements. Our findings indicated that high-yield plants transported more Ca, Mg, and B to the shoot, while low-yield plants stored higher Fe, Zn, and Al in the root. The significantly lower bioaccumulation factor and translocation factor of B and Mg in the high-yield plants highlighted the importance of nutrient storage in promoting C. Oleifera yield. Multiple regression analysis and the Mantel test demonstrated that plant yield and bioaccumulation and transportation of trace elements were more closely correlated with the stoichiometry of trace elements than their content. The significantly different stoichiometry of trace elements in soil of different yields revealed that the stoichiometry of trace elements was more sensitive and reliable in reflecting the balance in soil nutrients of C. oleifera and regulating its growth. This study provides a comprehensive understanding of the balance in soil trace elements and their relationship with the growth of C. oleifera and highlights the critical role of the stoichiometry of soil trace elements in promoting high and stable production of C. Oleifera .

Camellia oleifera

Trace element

Stoichiometry

10.22541/au.168596864.45033264/v1

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Polyelectrolyte Ultrathin Multilayer Films by Nano-self-assembly Process

Qi Sun

The ultrathin multilayer films were built-up by self-assemble of oppositely charged polyelectrolytes in aqueous solution. Its structure can be designed at molecular scale. This paper reviews their buildup, application, structure and factors that influence the structure.

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Experiment on uranium slabs of different thicknesses with D-T neutrons and validation of evaluated nuclear data

Fusion Engineering and Design (2017)

Qi Sun Zhaoxi Chen R. Han Y. Nie S. Zhang

Nuclear data

Slab

10.1016/j.fusengdes.2017.10.021

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A New Generation of Liquid Lasers from Engineered Semiconductor Nanocrystals with Giant Optical Gain

Laser & Photonics Review (2023)

Yuting Wu Zhigao Huang Qi Sun Van Duong Ta Sensen Wang

Abstract With the development of optofluidic technology, liquid lasers have attracted intense interest but still face a formidable challenge due to the lack of qualified gain media and creative device design. Compared to the organic fluorescent dyes and traditional CdSe‐based nanocrystals (NCs), the lead‐halide perovskite (LHP) NCs feature larger gain coefficient and higher robustness, which renders LHP NCs a promising unexploited liquid gain medium. Herein, for the first time, the hidden principle governing the solution‐based light amplification in LHP semiconductor NCs is demystified and it is demonstrated that the LHP NCs are superior solution‐phase gain media showing a giant (≈2600 cm −1 ) optical gain. On this basis, a novel microfluidic laser device is designed and realized that exhibits a record‐low pump threshold (≈22.7 µJ cm −2 ), high Q‐factor (≈7480), large output polarization (≈0.91), and long‐time robustness over high‐intensity operation, which is readily applicable to practical applications. The findings represent a significant step toward the technologically important liquid lasers of the new generation and can advance optofluidic applications.

Semiconductor optical gain

High-gain antenna

Gain

Robustness

10.1002/lpor.202200703

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Tuning of Magnesium Distribution in ZSM-5 via Different Impregnation Methods and Its Effect on Methanol to Propene Reaction

Industrial & Engineering Chemistry Research (2019)

Delin Yuan Yu Sang Aihua Xing Chuanfu Wang Ping Miao

Two modified zeolites, ZSM-5-Mg(OH)2 and ZSM-5-Mg(NO3)2, were achieved by Mg(NO3)2 impregnation methods with or without NH3·H2O as a precipitator, respectively. The Brønsted acid sites of ZSM-5 can be reduced by Mg modification, especially for the strong acid. The results from XRF and XPS showed surface Mg-rich for both modified ZSM-5 zeolites. However, Mg concentration on the surface of ZSM-5-Mg(OH)2 is significantly lower than that of ZSM-5-Mg(NO3)2, indicating the addition of NH3·H2O in the Mg(NO3)2 impregnation could suppress Mg enrichment on the surface. The results from methanol conversion showed significant effects of Mg-modification method on the catalytic performance. Severe surface Mg rich distribution favored the higher propene selectivity at the cost of reduction of catalytic lifetime. The suppressed surface Mg rich distribution prolonged catalytic lifetime and maintained the light olefin selectivity at high level. This work demonstrated the catalytic performance could be adjusted by Mg modification methods via tuning Mg distribution.

Propene

ZSM-5

Surface Modification

Acid strength

10.1021/acs.iecr.8b04434

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Citations (12)

Measurement of leakage neutron spectra from silicon carbide cylinders with D–T neutrons and validation of evaluated nuclear data

Fusion Engineering and Design (2016)

Fa Luo R. Han Y. Nie Zhaoxi Chen S. Zhang

Nuclear data

Leakage (economics)