The Preparations Of Molybdenum Disulfide Film And Research Of Characteristics Of The Photoelectric Detection

Due to its unique properties in electricity, optics and direct band gaps,molybdenum disulfide(Mo S2) has broad applications in many fields such as field effect transistor device and sensor so on. However, the key problem to promote its commercial and industrial development is that how to improve the preparation of Mo S2 material and enhance its device performance as well as optimize the device structure.In this paper, we mainly focus on Mo S2, describe several methods for its preparation,calculate Mo S2 absorption device structure and test Mo S2 detector in the photoelectric characteristics as well.To improve the light absorption of Mo S2, the gold array-Mo S2 device structure is established through the surface plasmon for localization effects of light field, and thus its absorption rate achieves 50%, which is far greater than the optical absorption of thin film. Meanwhile, we also discuss the influence on the efficiency of the light in gold array-Mo S2 structure under different situations, including the changes of gold particle radius and device period.Mo S2 detector device is prepared by preliminary experiments and tested via experimental facilities in Shanghai Institute of Technical Physics Laboratory, and the testing covers electricity, photovoltaic conversion, time response and mapping. In terms of electricity, it mainly tests the transfer characteristics of the device and the current characteristics. The ratio of the current switch can reach 105. In photoelectric conversion testing mainly has two points: one thing is to maintain the same test wavelength of optical power, and then test the frequency response curve of the photocurrent for different wavelengths of light. The light current of detector has the maximum at a wavelength of 600nm; another point is to test different optical power current-frequency characteristic curve at fixed wavelength 600 nm, and it is found that as the optical power increases constantly, the photocurrent is also increasing endlessly.It also solves some problems of the poor contact between the material and the metal electrode while testing. Experiments show that Mo S2 detector has different absorptivity in visible wavelengths, illustrating its bright future in photoelectric detector.