Lead halide perovskites have received tremendous attentions recently for their excellent properties such as high light absorption coefficient and long charge carrier diffusion length. However, the stability issues and...Lead halide perovskites have received tremendous attentions recently for their excellent properties such as high light absorption coefficient and long charge carrier diffusion length. However, the stability issues and the existence of toxic lead cations have largely limited their applications in optoelectronic area. Herein, we report the synthesis and investigation of highly stable and lead-free Cs3Bi2I9 perovskite nanoplates for visible light photodetection applications. The Cs3Bi2I9 nanoplates were synthesized through a facile solution-processed method, which is also applicable to various substrates. The achieved nanoplates present very good crystal quality and exhibit excellent long-term stability even exposed in moist air for several months. Photodetectors were constructed based on these high-quality perovskite nanoplates for the first time, and display a maximum photoresponsivity of 33.1 mA/W under the illumination of 450 nm laser, which is six times higher than the solution-synthesized CH3NH3PbI3 nanowire photodetectors. The specific detectivity of these devices can reach up to 10^10 Jones. Additionally, the devices exhibit fast rise and decay time of 10.2 and 37.2 ms, respectively, and highly stable photoswitching behavior with their photoresponse well retaining under alternating light and darkness. This work opens up a new opportunity for stable and low-toxic perovskite-based optoelectronic applications.展开更多
1.INTRODUCTION Two-dimensional(2D)materials are intriguing for wide applications such as electronics,optics,energy,catalysis,and so forth,which has rapidly fueled the development of nanoscience and technology in recen...1.INTRODUCTION Two-dimensional(2D)materials are intriguing for wide applications such as electronics,optics,energy,catalysis,and so forth,which has rapidly fueled the development of nanoscience and technology in recent decades.Because of their reduced dimensionality,large specific surface area,and atomic thickness,various novel behaviors and properties emerged,though the synthesis,preparation,and modification of 2D materials remain challenging on the atomic scale.展开更多
基金the National Natural Science Foundation of China (Nos.51525202, 51772084, 61574054, 61635001, and 51802089)Innovation platform and talent plan of Hunan Province (No.2017RS3027)+1 种基金the Program for Youth Leading Talent and Science and Technology Innovation of Ministry of Science and Technology of Chinathe Foundation for Innovative Research Groups of NSFC (No.21521063).
文摘Lead halide perovskites have received tremendous attentions recently for their excellent properties such as high light absorption coefficient and long charge carrier diffusion length. However, the stability issues and the existence of toxic lead cations have largely limited their applications in optoelectronic area. Herein, we report the synthesis and investigation of highly stable and lead-free Cs3Bi2I9 perovskite nanoplates for visible light photodetection applications. The Cs3Bi2I9 nanoplates were synthesized through a facile solution-processed method, which is also applicable to various substrates. The achieved nanoplates present very good crystal quality and exhibit excellent long-term stability even exposed in moist air for several months. Photodetectors were constructed based on these high-quality perovskite nanoplates for the first time, and display a maximum photoresponsivity of 33.1 mA/W under the illumination of 450 nm laser, which is six times higher than the solution-synthesized CH3NH3PbI3 nanowire photodetectors. The specific detectivity of these devices can reach up to 10^10 Jones. Additionally, the devices exhibit fast rise and decay time of 10.2 and 37.2 ms, respectively, and highly stable photoswitching behavior with their photoresponse well retaining under alternating light and darkness. This work opens up a new opportunity for stable and low-toxic perovskite-based optoelectronic applications.
基金This work was supported by the National Science Foundation of China(project nos.51872248,and 51922113)the Hong Kong Research Grant Council under the Early Career Scheme(project no.25301018)+3 种基金the Hong Kong Research Grant Council General Research Fund(project no.11300820 and 15302419)the City University of Hong Kong(project nos.9680241 and 7005259)The Hong Kong Polytechnic University(project nos.1-ZVGH and ZVRP)the Shenzhen Science,Technology and Innovation Commission(project no.JCYJ20200109110213442).
文摘1.INTRODUCTION Two-dimensional(2D)materials are intriguing for wide applications such as electronics,optics,energy,catalysis,and so forth,which has rapidly fueled the development of nanoscience and technology in recent decades.Because of their reduced dimensionality,large specific surface area,and atomic thickness,various novel behaviors and properties emerged,though the synthesis,preparation,and modification of 2D materials remain challenging on the atomic scale.
