Study On Preparation And Performance Of Inorganic Charge Transport Thin Films For Perovskite Solar Cells

Perovskite solar cells(PSCs)have high photoelectric conversion efficiency and simple preparation process,which could also be stacked with crystalline silicon solar cells and other solar cells,attracting much attention nowadays.Recently,PSCs are being planned for industrialization,but they still face many challenges.In fact,in addition to the perovskite materials,charge transport materials also have an important impact on device stability.The development of cheap and stable high-performance inorganic charge transport materials and their efficient thin film deposition methods are of great significance to the development of PSCs.In this paper,two inorganic metal oxide charge transport materials NiO_xand Zn O for PSCs are systematically studied.A low-temperature spray-combustion film deposition method and a film surface defect passivation strategy are used to prepare PSCs based on all-inorganic charge transport films.The specific work of the PSCsl is as follows:(1)The low-temperature spray combustion method is used to prepare the NiO_xhole-transporting films,and a trans-plate structure PSCs is constructed.The effects of parameters such as combustion temperature,oxidant/combustion aid ratio,and films thickness on the films morphology components,optical,and electrical properties were systematically explored.The advantages of the spray method over the spin coating method were explored.Intrinsic connection of carrier transport at the titanium ore interface.Finally,a device with a photoelectric conversion efficiency of 12.7%was obtained.The device showed excellent working stability,and the photoelectric conversion efficiency remained more than 60%of the initial value after 240h.(2)Using AlO_xto passivate NiO_xhole transport layer film surface defects to enhance the performance of PSCs.The effect of precursor concentration on the morphology of NiO_xfilms was explored.The internal relationship between the passivation parameters and the carrier transport process at the NiO_x/perovskite interface was investigated,and the mechanism of AlO_xpassivating NiO_xwas clarified.On this basis,the efficiency of the device can be increased from 12.3%to 14.5%,and the retention rate of the device's photoelectric conversion efficiency can be increased from 63%to 72%after 240 h.(3)A trans-plate structure perovskite solar cell with the NiO_xfilms as the hole transport layer and Zn O prepared by the sol-gel method as the electron transport material was further constructed.The relationship between the concentration of Zn O colloidal solution and film morphology was systematically explored,and the relationship between films thickness and carrier transport at the interface of Zn O/perovskite was investigated.Finally,a device based on all-inorganic charge transport materials with a photoelectric conversion efficiency of 9.5%was obtained.Compared with the device using PCBM as electron transport materials,the device efficiency retention rate after 240 hours of operation increased from 59%to 80%.This paper provides new preparation methods for charge transport materials of PSCs,and proposes feasible improvement strategies for the photoelectric performance and stability of devices.These methods and strategies have certain significance for the development of PSCs.This paper has 25 pictures,6 tables,and 123 references.