Fig. 3: Surface chemical properties.
From: In-situ entropic ligand engineering enables high-efficiency quantum dot solar cells
a Electrostatic potential distribution in DEHP molecule. b FTIR spectra of OA and DEHP capped FAPbI3 PQDs. c 31P NMR spectra of as-synthesized DEHP PQDs and neat DEHP. XPS core-level spectra of (d) P 2p, (e) Pb 4f, and (f) I 3d. DFT-simulated surface structure of (g) OA and (h) DEHP capped FAPbI3 PQDs. i The calculated surface absorption free energy of OA and DEHP.
