Perovskite has emerged as a class of star materials for photovoltaic application in terms of the low-cost solution-processed technology and the superior optoelectronic properties. Perovskite solar cells (PSCs) with high performance have been mainly fabricated through compositional and interfacial engineering. In this thesis, I mainly focus on the fabrication of planar PSCs using variable precursor compositions, such as CsPbIBr₂, MAPbI₃, (FAPbI₃)_0.85(MAPbBr₃)_0.15, (CsPbI₃)_0.05[(FAPbI₃)_0.85(MAPbBr₃)_0.15]_0.95, and (CsPbI₃)_0.05[(FAPbI₃)_0.90(MAPbBr₃)_0.10]_0.95. In addition, interfacial materials (including perovskite defect-passivation materials, hole transporting materials, and electrode interfacial materials) have been employed to (i) reduce the trap-state density and (ii) enhance the charg...[ Read more ]

Perovskite has emerged as a class of star materials for photovoltaic application in terms of the low-cost solution-processed technology and the superior optoelectronic properties. Perovskite solar cells (PSCs) with high performance have been mainly fabricated through compositional and interfacial engineering. In this thesis, I mainly focus on the fabrication of planar PSCs using variable precursor compositions, such as CsPbIBr₂, MAPbI₃, (FAPbI₃)_0.85(MAPbBr₃)_0.15, (CsPbI₃)_0.05[(FAPbI₃)_0.85(MAPbBr₃)_0.15]_0.95, and (CsPbI₃)_0.05[(FAPbI₃)_0.90(MAPbBr₃)_0.10]_0.95. In addition, interfacial materials (including perovskite defect-passivation materials, hole transporting materials, and electrode interfacial materials) have been employed to (i) reduce the trap-state density and (ii) enhance the charge-carrier transport, and hence to (iii) suppress the carrier recombination. The studies aim to (i) achieve crystal formation of different precursor compositions, (ii) develop interfacial materials to reduce non-radiative recombination, and (iii) fabricate high-performance and stable PSCs. This thesis tackles the critical challenges in PSCs research and lays the foundation for a fundamental understanding but also eventually industrialization.