The paper reports the recent achievement of the research on CZT for the application of X-ray andγ-ray detectors in Northwestern Polytechnical University.The crystals of both un-doped and In doped were grown with a se...The paper reports the recent achievement of the research on CZT for the application of X-ray andγ-ray detectors in Northwestern Polytechnical University.The crystals of both un-doped and In doped were grown with a self-designed Bridgman furnace.The microstructure analyses show that the crystals possess high crystallinity.Through In doping,the electronic properties were greatly improved and as high as 5×10^(10)Ωcm resistivity was obtained.The detectors produced with our crystal exhibits high resolutions o...展开更多
In this work,a simple and facile one-pot oleylamine solvothermal synthetic method was developed to synthesize Cu2ZnSnS4（CZTS） nanocrystals.And the Cu2ZnSn（S,Se）4（CZTSSe） thin films were prepared by selenizing CZ...In this work,a simple and facile one-pot oleylamine solvothermal synthetic method was developed to synthesize Cu2ZnSnS4（CZTS） nanocrystals.And the Cu2ZnSn（S,Se）4（CZTSSe） thin films were prepared by selenizing CZTS nanocrystals.The obtained CZTS nanocrystals and CZTSSe films were studied using X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDX）,and ultraviolet–visible spectrophotometer（UV–Vis）.TEM results show that the sphere–like CZTS nanoparticles with diameter between 12 and 35 nm are polydispersed.XRD studies indicate that the prepared CZTS nanocrystals form kesterite crystal structure,and the CZTSSe films with kesterite crystal structure are also obtained at the annealing temperatures of 500 and550 °C.In particular after annealing at 500 °C for 20 min,the CZTSSe film exhibits a smooth,uniform,crack-free,and large-grained topography and possesses Cu-poor and Sn-rich composition.Moreover,it shows strong optical absorption from visible to near-infrared（IR） region,and its optical band gap（Eg） is found to be about 1.44 e V.展开更多
文摘The paper reports the recent achievement of the research on CZT for the application of X-ray andγ-ray detectors in Northwestern Polytechnical University.The crystals of both un-doped and In doped were grown with a self-designed Bridgman furnace.The microstructure analyses show that the crystals possess high crystallinity.Through In doping,the electronic properties were greatly improved and as high as 5×10^(10)Ωcm resistivity was obtained.The detectors produced with our crystal exhibits high resolutions o...
文摘本文采用二步法制备Cu_2ZnSnS_4(CZTS)薄膜,首先通过真空热蒸发制备CuZnSn(CZT)预制层,其衬底加热温度分别为20℃、50℃、75℃和100℃,然后对所制备的CZT预制层在400℃下硫化60 min,从而制备出CZTS薄膜。利用XRD、Raman、SEM、反射谱和透射谱对所制备的CZTS薄膜进行了表征,实验结果表明,预制层衬底加热温度对CZTS薄膜结构与光学特性有很大影响,在衬底加热50℃时制备预制层硫化后所得CZTS薄膜具有高的结晶度、致密均匀的薄膜表面和最佳1.5 e V光学带隙。此外,与衬底未加热制备预制层在500℃和90 min最佳硫化条件下所制备的高纯CZTS薄膜相比,在50℃预制层衬底加热条件下所制备CZTS薄膜具有更好地结晶质量、更低的硫化温度和更短的硫化时间,这种现象表明衬底加热制备金属预制层利于更高品质CZTS薄膜的制备,可有效的降低硫化温度和缩短硫化时间,当前的研究结果为在低温下实现高质量CZTS薄膜的制备提供了一种有效的途径。
基金financially supported by the National Natural Science Foundation of China(Nos.11564027 and 51262020)the Scientific Research Foundation of the Higher Education Institutions of Inner Mongolia Autonomous Region of China(No.NJZY16379)
文摘In this work,a simple and facile one-pot oleylamine solvothermal synthetic method was developed to synthesize Cu2ZnSnS4（CZTS） nanocrystals.And the Cu2ZnSn（S,Se）4（CZTSSe） thin films were prepared by selenizing CZTS nanocrystals.The obtained CZTS nanocrystals and CZTSSe films were studied using X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDX）,and ultraviolet–visible spectrophotometer（UV–Vis）.TEM results show that the sphere–like CZTS nanoparticles with diameter between 12 and 35 nm are polydispersed.XRD studies indicate that the prepared CZTS nanocrystals form kesterite crystal structure,and the CZTSSe films with kesterite crystal structure are also obtained at the annealing temperatures of 500 and550 °C.In particular after annealing at 500 °C for 20 min,the CZTSSe film exhibits a smooth,uniform,crack-free,and large-grained topography and possesses Cu-poor and Sn-rich composition.Moreover,it shows strong optical absorption from visible to near-infrared（IR） region,and its optical band gap（Eg） is found to be about 1.44 e V.
