Constructing spike-like energy band alignment at the heterointerface in highly efficient perovskite solar cells

Abstract

The interface between the absorber and transport layers are shown to be critical for highly efficient perovskite solar cells (PSCs). The undesirable physical and chemical properties of interfacial layers often...

Synergistic Effect of 2-(Trifluoromethyl) Benzimidazole on the Stability and Performance of Perovskite Solar Cells

“…The water contact angles were measured for the perovskite films before and after TFMBI-modified, and the results are shown in Figure S1. It was observed that the contact angle of the modified film (58.99°) was significantly higher than that of the unmodified film (78.82°), which is closely related to the solid hydrophobic (−CF 3 ) groups covering the perovskite film surface …”

“…It was observed that the contact angle of the modified film (58.99°) was significantly higher than that of the unmodified film (78.82°), which is closely related to the solid hydrophobic (−CF 3 ) groups covering the perovskite film surface. 23 X-ray photoelectron spectroscopy (XPS) of the pristine and TFMBI-modified perovskite films were analyzed, the results are presented in Figures 2 and S2. In Figure 2a, a distinct F 1s peak is observed in the modified sample, indicating that TFMBI molecules are effectively introduced into perovskite film.…”

Interfacial modification via aniline molecules with multiple active sites for performance enhancement of n–i–p perovskite solar cells

“…The electron density of ANE predominantly distributed on CQO, NOO and C-O-C, making these sites the most potent Lewis base centers that could coordinate with Pb 2+ in PVK. 27 The surface of PVK films was modified at the SnO 2 /PVK interface using ANE's multi-active sites. Fig.…”

Heterointerface Energetics Regulation Strategy Enabled Efficient Perovskite Solar Cells

“…Beyond all doubt, the charge‐selective contacts at the perovskite heterointerface played a crucial role in the kinetics of charge injection and extraction. [ 10–12 ] The energetics across the heterointerfaces between the perovskite and charge transport layers, specifically the relative positions of the valence bands (VB) of perovskite with the highest occupied molecular orbital (HOMO) of the hole transport layer or the conduction bands of perovskite with lowest unoccupied molecular orbital (LUMO) levels of the electron transport layer, greatly influenced charge extraction, and consequently, device output efficiency. [ 10 ] Contrary to a flat band at the interface, charge transfer at heterointerfaces frequently resulted in extended space‐charge regions, also known as band bending or an abrupt step in vacuum level, which was typically referred to as an interface dipole.…”