Xiaojun Li

Chinese Academy of Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Yongfang Li

Chinese Academy of Sciences

Guichuan Xing

University of Macau

Qinggui Tan

China Academy of Space Technology

Zikang Tang

Northwest A&F University

Dandan Zhao

Xuchang University

Jianqi Zhang

National Center for Nanoscience and Technology

Di Wang

BGI Research

Lei Meng

Chinese Academy of Sciences

Tao Liu

Guangxi University

Wei Jiang

China Academy of Space Technology

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Beijing National Laboratory for Molecular Sciences

China Academy of Space Technology

University of Macau

Institute of Chemistry

Xi'an Jiaotong University

University of Hong Kong

Central South University

Wuhan University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Ruddlesden-Popper Perovskite for Stable Solar Cells

Energy & environment materials (2018)

Chao Liang Dandan Zhao Yan Li Xiaojun Li Shaomin Peng

Three‐dimensional metal‐halide perovskites have emerged as promising light harvesting materials for converting sunlight to electricity in the last few years. High power conversion efficiency of 23.3% has been demonstrated. However, the main challenge that currently limits the application of the perovskite solar cells is the long‐term stability, which has ambient, thermal, and photo stability weaknesses. Recently, the quasi two‐dimensional Ruddlesden–Popper perovskites have showed great potential to enhance the stability and achieved an acceptable power conversion efficiency (>13%) compared to the traditional three‐dimensional perovskites. The long organic cations in low‐dimensional perovskites are more hydrophobic than the typically used short methylammonium cation in three‐dimensional perovskites. Here, we summarize recent developments of the Ruddlesden–Popper perovskite solar cells, including Lead‐based quasi two‐dimensional and Lead‐free quasi two‐dimensional perovskite structure. The light harvesting performance and charge‐carrier dynamics in these perovskite solar cells are reviewed. In addition, critical challenges that limit the performance of Ruddlesden–Popper perovskite solar cells are discussed. Perspectives and future directions are proposed.

Thermal Stability

10.1002/eem2.12022

Cite

Citations (97)

G-band Broadband CPW-CPW-SIW-Rectangular Waveguide Transition for UTC-PD Application

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) (2021)

Caixia Wang Wei Shao Sheng Li Zhongbo Zhu Xiaojun Li

The configuration of the CPW-CPW-SIW transition.

Coplanar waveguide

10.1109/irmmw-thz50926.2021.9567510

Cite

Citations (0)

Improving open-circuit voltage by a chlorinated polymer donor endows binary organic solar cells efficiencies over 17%

Science China Chemistry (2020)

Ruijie Ma Tao Liu Zhenghui Luo Qing Guo Yiqun Xiao

Open-circuit voltage

Acceptor

HOMO/LUMO

10.1007/s11426-019-9669-3

Cite

Citations (323)

Frequency Selectivity in Pulse Responses of Pt/Poly(3-Hexylthiophene-2,5-Diyl)/Polyethylene Oxide + Li+/Pt Hetero-Junction

PLoS ONE (2014)

Fei Zeng Siheng Lu Sizhao Li Xiaojun Li Feng Pan

Pt/poly(3-hexylthiophene-2,5-diyl)/polyethylene oxide + Li+/Pt hetero junctions were fabricated, and their pulse responses were studied. The direct current characteristics were not symmetric in the sweeping range of ±2 V. Negative differential resistance appeared in the input range of 0 to 2 V because of de-doping (or reduction) in the side with the semiconductor layer. The device responded stably to a train of pulses with a fixed frequency. The inverse current after a pulse was related to the back-migrated ions. Importantly, the weight calculated based on the inverse current strength, was depressed during low-frequency stimulations but was potentiated during high-frequency stimulations when pulses were positive. Therefore, frequency selectivity was first observed in a semiconducting polymer/electrolyte hetero junction. Detailed analysis of the pulse response showed that the input frequency could modulate the timing of ion doping, de-doping, and re-doping at the semiconducting polymer/electrolyte interface, which then resulted in the frequency selectivity. Our study suggests that the simple redox process in semiconducting polymers can be modulated and used in signal handling or the simulation of bio-learning.

10.1371/journal.pone.0108316

Cite

Citations (25)

Trialkylsilyl-thiophene-conjugated acceptor for efficient organic solar cells compatible with spin-coating and blade-coating technologies

Science China Chemistry (2024)

Tengfei Li Qiang Wu Ze‐Fan Yao Hairui Bai Wenyan Su

Spin Coating

Acceptor

10.1007/s11426-023-1913-3

Cite

Citations (8)

Light-induced phase transition and photochromism in all-inorganic two-dimensional Cs2PbI2Cl2 perovskite

Science China Materials (2020)

Xiaojun Li Mingming Chen Shiliang Mei Bingzhe Wang Kaiyang Wang

Thermal Stability

10.1007/s40843-020-1290-y

Cite

Citations (17)

Spectrum-continuous narrowband filter with an enhanced flat-top passband and sharp roll-off performance

Optics Letters (2021)

Dong Liang Qinggui Tan Wei Jiang Wu Zhang Di Wang

We demonstrate a spectrum-continuous narrowband filter based on multi-section Mach-Zehnder interferometer (MZI) structures on a silicon nitride platform. Enhanced in-band flatness and sharp out-of-band roll-off features are achieved by cascading MZIs of specific functionalities in a series. This filter is fabricated in a single chip with a total waveguide length exceeding 237 cm. We experimentally demonstrate for the first time, to the best of our knowledge, a four-channel spectrum-continuous filter with a 3 dB bandwidth of 580 MHz, a 1 dB fluctuation bandwidth as high as 356 MHz, and an excellent 20 dB roll-off factor of 1.26 that are obtained simultaneously. Both the optical and electrical experimental results show that the proposed filter can play a key role in integrated microwave photonic front-end systems.

Narrowband

Passband

Flatness (cosmology)

Wideband

Channel spacing

10.1364/ol.438370

Cite

Citations (5)

Stable Whispering Gallery Mode Lasing from Solution‐Processed Formamidinium Lead Bromide Perovskite Microdisks

Advanced Optical Materials (2020)

Xiaojun Li Kaiyang Wang Mingming Chen Sisi Wang Yubin Fan

Abstract Formamidinium (CH(NH 2 ) 2 , FA) lead halide perovskites exhibit excellent optoelectronic properties for the applications of light‐emitting diodes and lasers. However, the reported formamidinium lead bromide (FAPbBr 3 ) perovskite‐based lasers mainly depend on the external feedback or Fabry–Pérot mode cavities and suffer from moderate quality ( Q ) factors. Herein, solution‐processed square and quasi‐circular FAPbBr 3 microdisks are developed to achieve room‐temperature naturally facet‐formed whispering gallery mode (WGM) lasers. These microdisks exhibit relatively high Q factor and tunable laser modes with threshold of 10–70 µJ cm −2 under 400 nm excitation. Although the synthesized circular microdisk is not regular enough, it still shows higher Q factor of 3455 than that of square microdisk due to the less boundary wave and pesudointegrable leakage. This simple and low‐cost solution processed method can tackle the complicated and expensive conventional preparation techniques of circular microdisks. Power dependent photoluminescence decay transients indicate that the band edge emission of the FAPbBr 3 microdisks originates from free carrier recombination. In addition, these microdisks show high photostability and that room temperature lasing can sustain over 50 min. These results suggest that FAPbBr 3 microdisks can serve as promising WGM lasers with excellent light emission capability and stability toward practical optoelectronic applications.

Formamidinium

10.1002/adom.202000030

Cite

Citations (40)

Short-length large-mode-area photonic crystal fiber laser operating at 978 nm

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2013)

Jing He Ziwei Wang Wendi Wu Songtao Du Qihong Lou

The laser performance of a short-length Yb-doped rod-type photonic crystal fiber (PCF) laser is studied experimentally both in the three-level scheme and quasi-four-level scheme in this contribution. In the free oscillation mode, the rod-type PCF laser produce 13.6 W output power on the quasi-four-level system with center wavelength of 1030 nm. The laser operating on the three-level system is obtained with the introduction of specialized feedback around the 976 nm radiation. Up to 7 W output power is generated with wavelength centered in 978 nm.

10.1117/12.2010950

Cite

Citations (1)

An Evolutionary Game Analysis of Shared Private Charging Piles Behavior in Low-Carbon Urban Traffic

Lequn Zhu Ran Zhou Xiaojun Li Linlin Zhang

Choosing new energy vehicles for travel, especially electric vehicles, is an important component of building a low-carbon urban transportation system. However, the charging need of electric vehicle users is still constrained by the unreasonable layout and insufficient supply of public charging piles in the city. Private charging pile sharing as an alternative policy tool can play a very good role in solving this problem. But it needs decision-makers in urban transportation to take corresponding measures to promote. This paper constructs an evolutionary game model to study the decision behavior of participants in private piles sharing platform. Through numerical simulation analysis, it is found that under most parameter conditions, the government tends to establish a shared charging pile platform based on public interests. Private charging pile owners are influenced by the relationship between the cost of supply modification and revenue, and they tend to join the shared platform when they expect to recover the modification cost. The research conclusions of this paper will provide support for exploring how participants make decisions to maximize overall benefits in the development of low-carbon urban transportation.

Evolutionary game theory

Component (thermodynamics)

10.20944/preprints202305.1278.v1

Cite

Citations (1)