Hydrothermal Synthesis And Optical And Electrical Properties Of Pyrite

An overview is first given on study of solar cell development all over the word, and explain the principle,classifying,structure,efficiency and so on. Particular recommend recent development of pyrite, including structure,semiconductor character,synthesis,Optical and electrical properties. Under investigation traditional preparation methods, we set forth hydrothermal synthesis pyrite. This way not only can easily solve mutil-step,high temperature annealing problems but also simplifies the working process and is easily controlled. First we have designed a new way to synthesize pyrite powder by a single stage hydrothermal method without introducing any further sulfur at acid condition. On the basis of series sample of time temperature and geological theory, we carefully analyze process of crystal growth and give reasonable explaining. After refine the typical sample, we discuss the accurate phase composing and crystal structure. Polycrystalline aggregates known as 'pyrite framboids' and the average grain size of the sample is about 500nm from the SEM determination. In ultraviolet–visible rang 215-314nm it shows strong absorbance. Just replacing by different metal ion Co or Ni source, so called Pyrites compound can be prepared through the hydrothermal method. On the contrary in the alkaline condition, FeS2 (Pyrite) nanocrystal have been synthesized successfully by the hydrothermal reaction using FeS2 crystalline seed with EDTA and tartaric acid as complex additives to optimize the preparation condition. The results showed that the product was single-phase pyrite with a ellipse–like form nano-size particle. It can account for that the polychalcogenides Qn2- has strong trend to compound with metal ions or base –group to synthesize nano-size materials. In the process, the free iron ions continuous release from Fe(II)—EDTA compound, then combine S22- in the solution to form pyrite. The optical direct bandgap taking blue shift can be explain by quantum confinement effect effective mass approximate method. Hall mobility rises more obvious than natural pyrite. After compare with traditional method we get the conclusion that hydrothermal can easily control. Even between hydrothermal, there exist distinctness that marcasite can be got rid of, final product remain nano-size particle and seed-induce do very important function. Moreover hydrothermal is a new way so there is a lot of work tobe solved. Pyrite materials have widely studing value and potential. Therefore this research has bright future.