Importance and Advancement of Modification Engineering in Perovskite Solar Cells

Abstract

Perovskite solar cells (PSCs) have achieved excellent power conversion efficiencies comparable to those of silicon-based cells. However, there are still many deficiencies in device stability, performance reproducibility, and hysteresis effect. Some surface modifiers and additives have been introduced in the last few years. Among them, organic ionic materials have attracted much attention due to their advantages of wide selection, strong electronic interaction, and good solubility. In this review, various ionic materials utilized in PSCs during recent several years are summarized. Their mechanisms to improve the device performance are thoroughly discussed, including the defect passivation on the surfaces and grain boundaries, improvement of energy-level alignment, modification of surface morphology, modulation of crystal structure, stabilization of perovskite phase, suppression of ion migration, protection against moisture, and formation of low-dimensional perovskite species. Finally, an outlook on the future research trends is proposed.

Temperature Matters: Enhancing Performance and Stability of Perovskite Solar Cells through Advanced Annealing Methods

“…MA + and I − ions with lower activation energy may migrate in high temperatures [123]. Smaller perovskite crystals are more likely to decompose than bulk perovskite crystals due to higher defect distribution density and more ion migration channels provided by the surface and grain boundaries, thus further reducing the activation energy [124]. Chen et al used TGA-FTIR to study the thermal decomposition process of mixed cationic perovskite FA x MA 1-x PbI 3 under different F.A.…”

Recent advances in ionic molecules applied in perovskite solar cells

“…16 Our research group have been dedicated to the application of ionic polymers in PSCs for more than 5 years and published a review concerning their mechanisms and progress. [17][18][19] Since then, some novel material types such as ionic liquids (ILs) have attracted major attention and more mechanisms have been proposed, requiring further consideration of the design concept of ionic materials. In this review, we survey the progress of additive and interfacial engineering in PSCs with ionic materials in the past year.…”

Taurine as a powerful passivator of perovskite layer for efficient and stable perovskite solar cells

“…In addition, the defects at grain boundaries and surfaces assist ion migration, and component loss accelerates perovskite decomposition, especially in thermal and humid environments. [11][12][13][14][15] Therefore, eliminating or passivating the defects in the perovskite light absorbing layer is very important to further enhance the PCE and stability of PSCs.…”