Investigation of High Stability Quasi-two-dimensional Perovskite Solar Cells

Abstract

In recent years although organic perovskite solar cells have been developed rapidly the low stability of the perovskite layer due to its sensitivity to water and oxygen is always the one of the key points to be improve In this work we adopt doping two types of spacer cations phenethylammonium and n-butylammonium into three-dimensional perovskite solar cells and these structures are generally called quasi-two-dimensional perovskite solar cells First of all the efficiency of the pure two-dimensional perovskite is currently low two-dimensional perovskites possess higher band gap which normally leads to higher Voc but the two-dimensional perovskite is an insulating material and belongs to a long carbon chain structure Therefore the structure will cause the short-circuit current density to drop Therefore by doping phenethylammonium into three-dimensional perovskites the alignment of the energy band and the use of additives to help form a vertical orientation growth can improve the open circuit voltage and short circuit current of the devices However because the phenethylammonium is a benzene ring structure there is a problem of benzene ring arrangement in the vertical orientation growth and it will cause a decrease in the fill factor Therefore we doped with another type of two-dimensional perovskite n-butylammonium to solve the problem of benzene ring arrangement and thus improves the fill factor In addition we also increase the short-circuit current by increasing the thickness of the perovskite layer and optimizing the film quality of the perovskite layer to achieve higher efficiency Finally this thesis completed quasi-two-dimensional perovskite solar cells with high stability by doping phenethylammonium and n-butylammonium

Date of Award	2020
Original language	English
Supervisor	Wei-Chou Hsu (Supervisor)