Large Area Preparation And Stability Study Of Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cells?PSCs?have attracted great attention due to their excellent photophysical properties,such as wide light absorption,high light absorption coefficient,long carrier transmission distance,bipolar transmission and good compatibility with roll-to-roll technology.These characteristics make it a research hotspot for renewable clean energy.In the past decade,the power conversion efficiency?PCE?of PSC has achieved world-renowned achievements,and it has jumped from the initial 3.8%to 25.2%.High PCE is the basis for the future commercialization of PSCs.However,there are still many challenges in the commercialization of PSCs.For example,the etching process and spin-coating process of large-area PSCs are complicated and inefficient,the stability of light and water is not enough,and the common transmission materials are expensive.This article mainly conducts two aspects of research work from the perspective of simplifying the preparation process of large-area PSCs and improving stability:?1?A simple two-step spin-coating process was used to prepare small-area?0.12 cm²?PSCs.The PCE of the small-area PSC was increased from 6%to about 18%by optimizing the thickness of each functional layer and interfacial treatment.In order to reduce the laser etching step and achieve the goal of simplifying the etching process for large-area PSCs,this experiment designed and prepared large-area PSCs under three different division methods?unetched ITO,etched ITO and laser etching whole device?.The J-V curve and photoluminescence spectra were used to study the effect of division methods on the performance of large-area?1,4,9 cm²?PSCs.The results showed that the PCE of 1 cm²unetched ITO PSC reached 14.38%.Compared with the cell based on etched ITO,the unetched ITO PSC exhibited considerable PCE and electron emission effect,that was,a high-efficiency large-area PSC could be prepared without etching ITO,thereby simplifying preparation.The process reduced the cost of PSCs and provided some theoretical guidance for the future commercialization of PSCs.?2?An high-efficient and stable?PEA?₂MA₄Pb₅I₁₆-based 2D PSCs was prepared by a one-step anti-solvent process.In order to solve the problems of 2D perovskite film surface roughness and charge transport,this experiment used CH₃NH₃I?MAI?to react with excess PbI₂ in the perovskite precursor solution,thereby forming a MAPbI₃.This not only passivated the surface defects of 2D perovskite film,but also enhanced charge transport rate.The method was operated at room temperature and convenient.At the same time it had good reproducibility.Compared with the control device,the PCE of PSC with MAI treatment increased from 9.53%to 11.85%,which significantly improved?25%increments?.After being stored for 1500 hours in an unencapsulated condition under a glove box at room temperature,the cell's efficiency remained above 93%and showed good stability,which provided guidance for the commercialization of large-area PSCs in the future.