Bulk Bi-Sb polycrystals underpinned by high electron/phonon mean free path ratio enabling thermoelectric cooling under 77 K

X Xiaowei Wu Z Zhen Fan (Key Laboratory of Quality and Safety Control for Subtropical Fruit and Vegetable, Ministry of Agriculture and Rural Affairs, Horticultural Sciences Department, College of Horticulture Science, Zhejiang A&F University) H Hangtian Zhu T Tianyu Wang M Meng Liu J Jun Li N Nan Chen (National Engineering Research Center of Lower-Carbon Catalysis Technology, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics) Q Qiulin Liu Z Zhen Lu (State Key Laboratory of Fluorine & Nitrogen Chemicals, College of Chemical Engineering) G Guodong Li (Chinese Academy of Sciences (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience) X Xin Qian T Te-Huan Liu R Ronggui Yang X Xiaoyan Niu Q Qi Zhao Z Zhiliang Li S Shufang Wang H Huaizhou Zhao