Preparation Of Antimony Sulfide Materials And Its Application Of Solar Cells

Sb₂S₃ is an important semiconductor material of V-VI group.Sb₂S₃ are earth-abundant,low-toxicity and air-stable materials,which has attracted great attention of researchers in recent years.Sb₂S₃ has a high absorption coefficient(??10⁵ cm^-1)and a tunable band gap?1.5².2 eV?.Theoretically,the photoelectric conversion efficiency?PCE?of Sb₂S₃ solar cells can reach 32%,so it is an ideal semiconductor solar cell material with great development and application prospects.However,chemical bath deposition method?CBD?is still the main method for the synthesis of Sb₂S₃ films,and the quality of the film after annealing is not good.At present,the maximum photoelectric conversion efficiency of Sb₂S₃ solar cells is7.5%,which is relatively low compared to conventional silicon solar cell.Studies have shown that the lower carrier concentration of Sb₂S₃ material and higher resistivity are also factors leading to low efficiency.How to improve the crystal quality of Sb₂S₃ film to form a film with uniform and dense grain size and how to increase the carrier concentration to improve its mobility is a hot research topic.Aiming at the above problems,a novel in situ hydrothermal method for preparing Sb₂S₃ thin films was proposed,and Cu was doped to improve the carrier concentration.The research contents are as follows:?1?Preparation of Sb₂S₃ film by a novel in-situ hydrothermal method.First,metal Sb films were deposited on substrates using room-temperature radio frequency magnetron sputtering the FTO substrate to form an FTO/Sb sample,and then the FTO/Sb sample was suspended in the high pressure reactor at 2 cm above the ethanol level to form an FTO/Sb₂S₃ sample by low temperature hydrothermal reaction.It was then annealed at 300°C for 10 min in an argon atmosphere.The morphological characteristics,light absorption characteristics,crystal structure and chemical composition of the instrument were studied and analyzed.The results show that the crystal quality is significantly improved compared to the traditional CBD method.The J-V curve was obtained under the illumination of AM1.5G,100mW cm^-2,Planar Sb₂S₃solar cells utilizing in situ fabricated Sb₂S₃ film as absorber has also been fabricated and yielded a power conversion efficiency of 1.32%.The method can provide a new idea for large-scale and low-cost preparation of Sb₂S₃ film.?2?Cu doped Sb₂S₃ films with different concentrations were prepared.A Cu foil was placed on the Sb₂S₃ target by co-sputtering,and the concentration of Cu doping was controlled by the area of Cu.Pristine Sb₂S₃ and Sb₂S₃ doped with different Cu concentrations were prepared.The morphology,crystal structure and chemical composition were analyzed by a series of characterizations.The results show that the Fermi level and the carrier concentration of the Sb₂S₃ film are increase after Cu doping,which is beneficial to improve the mobility of carriers.On this basis,the Sb₂S₃ planar structure of the battery was prepared.Finally,the Sb₂S₃ film with a doping amount of 8.6%was the best,and the PCE=1.13%.Compared with pure Sb₂S₃ films,the crystallization quality and conversion efficiency are improved...