Latest News
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Danish Minister of Higher Education and Science Visits UCAS
On January 6, Christina Egelund, Danish Minister of Higher Education and Science, visited University of Chinese Academy of Sciences (UCAS) with representatives from several Danish universities, including University of Copenhagen, University of Southern Denmark, Technical University of Denmark and Copenhagen Business School. WANG Yanfen, Executive Vice President of UCAS, Vice President JIN Depeng, and Vice president LIN Xiao, welcomed the guests at the SDC Building of UCAS.
WANG Yanfen extended a warm welcome on behalf of UCAS and introduced the mechanism of science and education integration, talent cultivation achievements and international cooperation of UCAS. She emphasized that the Sino-Danish centre for Education and Research (SDC) serves as a model of higher education and research cooperation between China and Denmark. Celebrating the 75th anniversary of Denmark’s recognition of the People’s Republic of China and the 15th anniversary of the formal signing of the partnership agreement of SDC, she expressed the hope of transforming SDC into a more extensive collaborative platform.
Christina Egelund was willing to explore ways to enhance China-Denmark cooperation in higher education and scientific research development. She looked forward to exploring both the opportunities and challenges inherent in areas of mutual interest such as green research, climate change, the environment, and global health, where China serves as a crucial partner for Denmark and the international community. As she wrote on the guestbook, “My best wishes for a fruitful future.”
During the visit, Christina Egelund and the delegation toured the SDC building and engaged in discussions with students from the Sino-Danish College.
Over 30 participants attended the event including Michael Starbæk Christensen, Ambassador of Denmark to China, HE Fuxiang, Technological counselor of the Chinese Embassy in Denmark, LIU Ning, Deputy Director, Division of European Affairs, Bureau of International Cooperation of CAS.
Author: XU Jingsi
Editor: GAO Yuan
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Research News
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Suppressed Ion Migration in Tin Halide Perovskites for Stable X-Ray Detectors with Low Dark Current Drift
The detection of X-ray photons holds great significance for a wide range of applications, including medical radiography, intelligent security inspection, and environmental radiation monitoring. Halide perovskite X-ray detectors have attracted attention due to their large mobility-lifetime products, high sensitivity, and low detection limit. However, lead-based perovskites face toxicity issues, and significant internal ion migration leads to poor stability. Among lead-free perovskite materials, tin halide perovskites show great potential in radiation detection due to their high X-ray attenuation absorption coefficient, high charge carrier mobility, low exciton binding energy, and high ion migration activation energy. However, there is limited research on the radiation detection characteristics of tin halide perovskites.
Recently, the research group led by Professor MENG Xiangyue from the School of Optoelectronics at the University of Chinese Academy of Sciences, along with collaborators, selected an additive PAI to effectively improve the quality of tin-based perovskite films. This led to the development of FASnI3 perovskite films with low trap state density, enhanced crystallinity, and morphology, confirmed through in situ photoluminescence spectroscopy measurements. Due to their high polarity and efficient dielectric screening effect, FASnI3 films exhibit low exciton binding energy, high carrier mobility-life product, and high ion migration activation energy. The resulting FASnI3 perovskite X-ray detectors demonstrate high sensitivity and an ultra-low detection limit of 7.95 nGyairs-1. Compared to lead halide perovskite devices, FASnI3 perovskite X-ray detectors exhibit excellent device stability, with suppressed dark current drift. Moreover, high-contrast sensitive imaging was also achieved at an ultra-low dose rate of 70 nGyairs-1.
This work offers new ideas for exploring tin halide perovskites for high-sensitivity and high-stability X-ray detection. The achievement was recently published in Laser & Photonics Reviews, with Professor MENG Xiangyue as the corresponding author, doctoral candidate WANG Xu as the first author, and Dr. BIAN Yangshuang from the Institute of Chemistry, Chinese Academy of Sciences, as the co-first author.
Article information：
Suppressed Ion Migration in Tin Halide Perovskites for Stable X‐Ray Detectors with Low Dark Current Drift
WANG Xu, BIAN Yangshuang, WANG Hao, WANG Junfang, LIU Tianhua, XIAO Hongbin, GUO Yunlong, WEI Wenjuan, YANG Yang (Michael), MENG Xiangyue
Laser & Photonics Reviews
DOI: 10.1002/lpor.202401310
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