Professor Zhang Qingjie cooperated with Japanese scientist Lin Xiya Zhengfang to put forward a new scientific concept of solar thermoelectric-photovoltaic composite power generation technology, which combines solar thermoelectric conversion technology based on high-efficiency thermoelectric materials with solar photovoltaic conversion technology based on photovoltaic cell materials. With the support of the major international cooperative research project of the National Natural Science Foundation of China and JST of Japan, the first international experimental system of solar thermoelectric-photoelectric composite power generation with 50% intellectual property rights of China and Japan was developed and successfully tested, which opened up the full spectrum of solar energy (200 ~ 300). On this basis, according to the huge demand for high-efficiency thermoelectric materials put forward by the development of solar energy high-efficiency thermoelectric-photoelectric composite power generation technology, industrial waste heat high-efficiency power generation technology and small temperature difference power generation technology, in cooperation with team members, it is proposed to study the electrothermal synergistic transport law of thermoelectric materials at different scales (atomic-molecular, nano-mesoscopic and submicroscopic scales), especially the influence law of new physical effects in low-dimensional structures and composite structures on electrothermal transport process. The research on the formation law and control principle of the microstructure of thermoelectric materials and the scientific thinking of the new technology of integrated preparation of thermoelectric materials has been supported by the National Major Basic Research Plan (973 Plan), which greatly improves the performance of thermoelectric materials and develops a new thermoelectric material system. As the chief scientist organization, "Basic Research on High Efficiency Thermoelectric Conversion Materials and Devices" was supported by the National Major Basic Research Program (973 Program) in 2006.

In the research of new methods, technologies and new material systems for the preparation of high-performance thermoelectric materials, in cooperation with team members, new methods for the preparation of non-equilibrium nanocrystalline thermoelectric materials, new methods for the preparation of stress-induced low-dimensional thermoelectric materials, new methods for the preparation of nanocrystalline thermoelectric materials by cross-precipitation combined with rapid densification of discharge plasma and their integrated preparation technologies were proposed and established. With the new preparation method and technology, the maximum performance figure of merit ZT of P-type and N-type filled CoSb3 thermoelectric materials reached 65,438 0.2 (800 K) and 65,438 0.25 (850 K), respectively, and the maximum performance figure of merit ZT of P-type Bi2Te3 thermoelectric materials reached 65,438 0.35 (300 K). Related research has published a series of high-level academic papers in important international academic journals such as APL and JAP (such as APL90, 2007; ; APL89，2006； 2005 APL87JAP 100, 2006; JAP97, 2005, etc. ).

Professor Zhang Qingjie won the first prize of natural science 1, the first prize of technological invention 1, the first prize of scientific and technological progress 1 and the second prize of natural science 1. He has published 64 SCI papers in international and domestic academic journals such as APL, JAP, China Science Bulletin and Journal of Physics. , collected and cited by famous retrieval tools such as SCI and EI for more than 20 times, and published academic works 1 department.