Highly ordered lead-free double perovskite halides by design  

作　　者：Chang Won Ahn Jae Hun Jo Jong Chan Kim Hamid Ullah Sangkyun Ryu Younghun Hwang Jin San Choi Jongmin Lee Sanghan Lee Hyoungjeen Jeen Young-Han Shin Hu Young Jeong Ill Won Kim Tae Heon Kim 

机构地区：[1]Department of Physics and Energy Harvest-Storage Research Center(EHSRC),University of Ulsan,Ulsan,44610,Republic of Korea [2]UNIST Central Research Facilities(UCRF)&School of Materials Science and Engineering,Ulsan National Institute of Science and Technology(UNIST),Ulsan,44919,Republic of Korea [3]Multiscale Materials Modelling Laboratory,Department of Physics,University of Ulsan,Ulsan,44610,Republic of Korea [4]Department of Physics,Pusan National University,Pusan,46241,Republic of Korea [5]School of Electrical and Electronics Engineering,Ulsan College,Ulsan,44610,Republic of Korea [6]School of Materials Science and Engineering,Gwangju Institute of Science and Technology,Gwangju,61005,Republic of Korea

出　　处：《Journal of Materiomics》2020年第4期651-660,共10页无机材料学学报（英文）

基　　金：the National Research Foundation of Korea(NRF)grants funded by the Ministry of Science and ICT(NRF-2020R1F1A1057220);the Ministry of Education(NRF-2019R1A6A1A11053838);C.W.A acknowledges the support by Basic Science Research Program through the NRF funded the Ministry of Science and ICT(NRF-2018R1A2B6009210);Y.H.H.acknowledges the support by the NRF of Korea(NRF-2019R1I1A3A01063856);H.Y.J.acknowledges the support from Creative Materials Discovery Program(NRF-2016M3D1A1900035);Y.-H.S.acknowledges the support by Basic Science Research Programthrough the NRF funded the Ministry of Science and ICT(NRF-2018R1A2B6005159);Experiments at PLS-II were supported in part by MSICT and POSTECH.

摘　　要：Lead-free double perovskite halides are emerging optoelectronic materials that are alternatives to leadbased perovskite halides.Recently,single-crystalline double perovskite halides were synthesized,and their intriguing functional properties were demonstrated.Despite such pioneering works,lead-free double perovskite halides with better crystallinity are still in demand for applications to novel optoelectronic devices.Here,we realized highly crystalline Cs2AgBiBr6 single crystals with a well-defined atomic ordering on the microscopic scale.We avoided the formation of Ag vacancies and the subsequent secondary Cs3Bi2Br9 by manipulating the initial chemical environments in hydrothermal synthesis.The suppression of Ag vacancies allows us to reduce the trap density in the as-grown crystals and to enhance the carrier mobility further.Our design strategy is applicable for fabricating other lead-free halide materials with high crystallinity.

关 键 词：Cs2AgBiBr6 LEAD-FREE Double perovskite Single crystal 

分 类 号：O61[理学—无机化学]