Study On The Effect Of Cross-linked Materials Modification On The Performance Of Perovskite Solar Cells

Over the past decade,perovskite solar cells(PSCs)have made unprecedented progress in improving photovoltaic efficiency,but they still face serious challenges.Defects in the perovskite layer,especially at grain boundaries,severely limit the performance and stability of the battery.Morphological optimization of perovskite films,such as film coverage,roughness,grain size and grain boundaries,has been considered an extremely important factor in achieving high efficiency.At present,materials engineering and interface engineering are considered to be the most effective methods to improve perovskite films.This thesis mainly studies the performance effects of PSCs doped with 3-carboxyphenylboronic acid(CPBA)crosslinker body and PSCs based on3-carboxyphenylboronic acid(ACPBA)crosslinker interface,the main contents are as follows:(1)To explore the specific influence of CPBA crosslinked materials on the performance of perovskite materials when bulk doping of perovskite materials.By preparing perovskite films by a two-step method,it is found that the efficiency of the device can reach 20.36% at the optimal doping concentration,while the initial efficiency is only 17.17%.Among them,CPBA molecules and perovskite molecules interact strongly through Lewis base/acid coordination,and act as cross-linked materials to link perovskite molecules together,which effectively reduces film defects and inhibits trapassisted non-radiation recombination,and improves optical and electrical properties.In addition,under the modification of CPBA,with the increase of grain size,the obtained perovskite film shows better morphology.(2)To explore the specific effect of ACPBA crosslinked materials on the performance of perovskite materials when anti-solvent interface modification is carried out.By preparing perovskite films by one-step method,it is found that the efficiency of the device can reach 18.63% at the optimal doping concentration,while the initial efficiency is only 16.95%.Among them,ACPBA molecules are modified by interface,using the strong interaction of molecular coordination as cross-linking materials to promote crystallization and modify thin films.At the same time,it also plays a passivation role,which significantly improves the stability of the device.Based on the above work,the use of crosslinked materials to modify perovskite solar cells successfully improves the performance of the device and provides a potential path for the development of the device.