Preparation And Study Of TiO₂ Nanorod Array Perovskite Solar Cell

The narrow band-gap semiconductor of Sb₂S₃ has attracted widespread attention due to its suitable optical band gap,high absorption coefficient,and cheap manufacturing cost.In order to reduce the charge recombination rate and improve the power conversion efficiency of solar cells,TiO₂ nanorods array as the electron transport layer,narrow gap semiconductor Sb₂S₃ nanoparticles were used as the photoactive materials to prepare solar cells?organic-inorganic hybrid solar cells and perovskite solar cells?,in this paper,the performance of hybrid solar cells was improved by optimizing the internal structure of the device.1)A blend P3HT and Spiro-OMeTAD was used as photoactive layer and hole-transport material in the hybrid solar cell with TiO₂ nanorod/Sb₂S₃ nanoparticles composite film,in which Sb₂S₃ nanoparticals were prepared with different ratios of antimony source and sulfide source?Sb/S?by chemical bath deposition method.The UV-vis absorption results show that Sb₂S₃ significantly increase the light absorption range.The results of the J-V characteristic curve show that when the hole-transport material is a blend of P3HT and Spiro-OMeTAD in a ratio of 15 mg/mL,and Sb/S=1/1,the best power conversion efficiency of hybrid solar cell based on FTO/TiO₂/Sb₂S₃?1/1?/P3HT:Spiro-OMeTAD?15 mg/mL?/Ag could reach 4.57%.The electrochemical impedance spectroscopy and steady-state fluorescence spectrum also confirm that the interface recombination rate of the optimal device is lower and the electron lifetime is longer.2)Sb₂S₃ nanoparticles were introduced into TiO₂ nanorod arrays perovskite solar cell,and the UV-vis absorption results show that Sb₂S₃ significantly improve the light absorption capacity of the device.However,J-V characteristic curve and energy level location analysis indicate that the higher energy level barrier caused by Sb₂S₃ placed in front of the perovskite has a negative effect on improving the efficiency of the perovskite solar cell.3)Sb₂S₃ nanospheres obtained by solvothermal method were introduced into P3HT by ultrasonic dispersion method to prepare Sb₂S₃:P3HT micro-heterostructure.T he effects of different ratios of Sb₂S₃:P3HT micro-heterostructure on the performance of TiO₂nanorod array perovskite solar cells were compared.The UV-vis absorption results show that Sb₂S₃:P3HT microheterostructure significantly increase the light absorption range.The J-V characteristic curve show that the power conversion efficiency of solar cells with Sb₂S₃:P3HT microheterostructure is generally increased,the best power conversion efficiency of device with FTO/TiO₂NR/Perovskite/Sb₂S₃:P3HT-15/Spiro-OMeTAD/Ag could reach 15.56%.The electrochemical impedance spectroscopy and steady-state fluorescence spectrum also confirm that Sb₂S₃:P3HT micro-heterostructure could promote the separation and transmission of photo-generated charges.The reduced charge recombination efficiency,and increased electronic lifetime could result in an improved power conversion efficiency of perovskite solar cell.