Interface Regulation To Fabricate Efficient And Stable Perovskite Solar Cells

The power conversion efficiency(PCE)of perovskite solar cells(PSCs)has increased from 3.8% to 25.5% in the recent decades.However,the stability is still the main obstacle for the commercialization of PSCs.Perovskite could degrade in the light,high humidity and temperature.Besides,the intrinsic defects and the ion migration can also lead to the degradation.To improve the stability of PSCs,we modified the interfaces of perovskite,electron transport materials(ETMs)and hole transport materials(HTMs).This dissertation has five chapters,and listing as follows:Chapter 1: We briefly introduced the perovskite crystal structure,the device structure,analyzed the developing challenges and corresponding solutions,and proposed the basis and research content of this dissertations.Chapter 2: For the interface of perovskite layer and ETMs,we systematically studied the annealing temperature of Zn O,because the residual ligand of different annealing temperature can affect the performance and stability of PSCs.Chapter 3: For the interface of perovskite and HTMs,we applied porphyrin(Zn P)in perovskite.The carbon-carbon double bond could in-situ polymerize after thermal treating,and the carbonyl group could coordinate with Pb to help reduce the defects.As a result,the performance and stability of PSCs increased.Chapter 4: We used hydrophobic Zn-THPP into perovskite to adjust the interface of perovskite and HTMs.Zn-THPP could form the hydrogen bond with the organic cation of perovskite lattice,which could help it anchored in the perovskite film.The humidity stability increased obviously.Besides,the interaction of Zn-THPP and perovskite could slow down the crystallization of perovskite,we can obtain the high quality perovskite films.Consequently,the performance and stability of PSCs enhanced.Chapter 5: Conclusion and outlook of this dissertation.