Study On The Preparation Of Nano Photovoltaic Materials And Their Photoelectrochemical Performance

In this paper several low-dimensional nano-photovoltaic materials have been synthesized via hydro-/solvotheral routes.The as-obtained product was investigated by X-ray diffractom-eter (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and infrared spectrum (IR). The recent development route synthesis of morphology and structure tailored this kind of photovoltaic materials by hydrothermal and solvothermal route is described, its characteristic and grow mechanism are also investigated. At last, the problems that the study meet in the present and the prospect in the future for synthesis of photovoltaic materials by hydrothermal and solvothermal route are discussed. The main conclusions of this paper are showed as follows:Using solvothermal method, We obtained uniform ZnSe precursor nanoribbon arrays on Zn foils in en. By heating the ZnSe precursors in N2at300℃for3hours, The ZnSe nanoribbon array can be easily obtained. The as-prepared precursors and the annealed products were characterized by scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction. The nanoribbons are mostly about2μm in length,100-300nm in width, and4nm in thickness. The possible growth mechanisms of the ZnSe precursor nanoribbon arrays are proposed.Novel carbon nitride polymer sensitized ZnSe nanoribbon arrays are prepared by electrodeposition. Our results show that the CN polymer can be used to sensitize ZnSe nanoribbon arrays, making them more responsive to the visible light. The significantly high photocurrent achieved here confirm that the unique nanoribbon array structure can facilitate the propagation and kinetic separation of photogenerated charges, indicating an important application of the organic CN polymer sensitized ZnSe nanoribbon array films in solar cells and photocatalysis. For the ZnSe nanoribbon array electrode, the open-circuit photovoltage (Voc) is0.437V versus an Ag/AgCl electrode. The generated photocurrent (Jsc) is0.086mAcm-2, and a FF (fill factor) of61%, with a photoconversion efficiency of0.037%. By a simple and convenient solvothermal route using CuCl, In2O3and thiourea solution as starting reagents in glycol, copper indium sulfide (CuInS2) microspheres were synthesized. The as-synthesized products were characterized by means of powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy. XRD patterns reveals that the obtained products are well crystallized. SEM image reveals that the prepared microspheres are composed of sheet-like and sphere-like nanocrystals. The photovoltaic properties of CuInS2micro-spheres indicate that exhibited a Jsc of28.4mAcm-2, a Voc (open-circuit voltage) of0.185V and a FF (fill factor) of0.273%, with a photoconversion efficiency of0.53%.