Study On Efficient And Stable Perovskite Solar Cells

In recent years,the power conversion efficiency?PCE?of perovskite solar cell?PSC?is 25.2% due to its excellent photovoltaic performance certification.^[1]The excellent properties are attributed to the excellent properties of perovskite materials,such as high optical absorption coefficient and adjustable optical band gap.However,some challenges hinder the commercialization of perovskite solar cells,including limited spectral response,poor air stability and flexibility.Obviously,in order to commercialize perovskite solar cells,the above problems must be solved,among which the two main problems that hinder perovskite solar cells are the inability to large-scale modular preparation and poor stability.During his master's degree,the author mainly studied the above two problems.Through the final experimental results,doping can reduce the defect state density of electron transport layer and calcium titanium ore layer,and improve the crystallinity of calcium titanium ore layer to enhance the stability of perovskite solar cells.?1?First of all,we have realized the large-scale preparation of electron transport layer by using electron beam deposition technology.Then we have explored the best thickness of electron transport layer by using electron beam deposition.At the same time,we have doped Zn2+into the electron transport layer,and finally realized the long-term stability of1000h.PCE has increased from 18.95%to 20.16%.Low temperature electron beam and large-scale preparation provide a way for future commercialization.?2?On the basis of the first work,we doped rare earth ions into the perovskite absorption layer,which greatly improved the crystallinity and electron mobility of the perovskite layer.Ce³⁺doping improves the efficiency and stability of perovskite solar cells.The efficiency before and after doping was 18.50%and 21.67%,respectively.The PCE loss of the doped devices is over 60%and 80%respectively when they are stored in the room for 3200 h and irradiated at 365nm for 150h.Under the same conditions,the PCE loss of the original PSC is 90%and 100%respectively.Ce³⁺doped Perovskite solar energy performance comes from the special Ce³⁺/Ce⁴⁺redox pair and the unique 4f-5d transition in the UV region.Finally,we fabricated a flexible device with an area of 1.25 cm².