Reinforcing perovskite framework via aminotrifluorotoluene for achieving efficient and moisture-resistance solar cells

2-Amino-5-chlorobenzophenone passivating perovskite films using multiple functional groups towards high-performance solar cells

“…S3b, ESI †), which indicates that the electron-donating ability of -CQO brings about a Lewis acid-base coordination interaction between the O in the -CQO of ACB and Pb 2+ . 52 Furthermore, the proton chemical shift peak from the -NH 2 group in FA (at 8.82 ppm) is split into two peaks at 8.94 and 8.66 ppm with ACB addition, as given in Fig. S3c (ESI †); this is due to the formation of ClÁ Á ÁH-N hydrogen bonds between ACB and FA.…”

Fine-tuning chemical passivation over photovoltaic perovskites by varying the symmetry of bidentate acceptor in D–A molecules

“…5a, the perovskite lms with bidentate passivators achieved about 64°of the contact angles, which was higher than that of control one, indicating the better humidity stability of perovskite lms treated by bidentate passivators owing to the enhanced hydrophobicity. 26,64 Therefore, the perovskite lm with bidentate passivators can remain black with little change under exposure in highly humid conditions (80-90% RH) for 10 days (Fig. 5b), while the control one faded to yellow.…”

Perovskite Surface Passivation Using Thiophene-Based Small Molecules for Efficient and Stable Solar Cells

“…The XRD results show that the crystallinity of the perovskite films is improved with the preferential growth direction of the perovskite crystals. The π-conjugated bond of the Th ring in TAA is responsible for the preferential growth of the (110) plane of perovskite crystal. , The interaction of the −CO group and Pb 2+ in the precursor could form a coordinative intermediate, which slows crystal growth. , The improvement in the crystallinity of the perovskite film results in an increase of UV–vis absorbance in the wavelength range of 450–750 nm (Figure S6), which is in agreement with a previous study …”

“…Li et al introduced 2-(2-pyridyl)­ethylamine (2-PyEA) molecules with 2D structure on the surface or into the bulk perovskite, boosting the FA/MA PSC efficiency to 23.2% . Wang et al used the 2-aminoacetamidobenzotrifluoride molecule, which contains an electron-donating group (−NH 2 or −CO) and the hydrophobic group of −CF 3 to passivate defects and enhance the stability of the MAPbI 3 perovskite, with the conversion efficiency increasing to 21.62% . However, the electrical insulating nature of long-chain organic ligand cations impedes charge extraction or transport from the perovskite film to the hole-transport layer (HTL) in n–i–p structures.…”