Effect Of Organic Ammonium Salt Modification On The Performance Of Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cells have been rapidly created as solar cell technology has advanced due to their tremendous commercial potential.However,the fact that perovskite materials decompose easily in high light,heat,and humidity has hampered commercialization,and the photoelectric efficiency and stability of perovskite solar cells continue to confront issues that require additional research and development.Investigate methods for enhancing the efficiency and stability of perovskite solar cells(PSCs)in order to expand their practical applications.We utilized ethylenediammonium chloride(EDACl)to dope the SnO2 electron transport layer and investigated the best doping concentration by evaluating the performance of the device after doping.It was investigated that the impact of EDACl doping in the surface morphology of SnO2 films,as well as the impact of the light absorption characteristics and charge transport properties of perovskite films.The greatest photoelectric conversion efficiency of PSCs can approach 20.20%,and the device based on EDACl doped SnO2 has good repeatability.Cyclopentylethylamine hydrochloride(CPEACl)was spin-coated on the surface of the perovskite film to form two-dimensional(2D)perovskite.It had the effect of passivating the surface.The findings shown that the CPEACl treatment may significantly modify the perovskite film’s surface,and that the development of a 2D perovskite modification layer can prevent carrier recombination at the interface and enhance photovoltaic performance.The PSCs efficiency reached 22.23%,and in the unencapsulated condition,it still maintained 95.5%of the initial efficiency after 1150h.In order to better passivate the iodine vacancy defects on the surface of the film,Cl in CPEACI was replaced with I,and Cyclopentylethylamine hydroiodide(CPEAI)was used to create 2D perovskite passivation layer to prepare effictive and stable PSCs.The results shown that the 2D perovskite passivation layer can affect the energy band inside the cell’s structure,diminish film surface roughness,improve hole extraction efficiency,and efficiently suppress recombination at the interface.Eventually,the efficiency of the CPEAI modified PSCs can reach 23.20%.Furthermore,the CPEAI treated PSCs exhibit outstanding stability under high temperature and high humidity circumstances due to the superior hydrophobic characteristics of the 2D perovskite layer.