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Interfacial N→Sb Nonbonded Interaction Enhances the Photoelectronic Performance of PVP‐Capped Sb 2 S 3 Amorphous Colloids
Author(s) -
Wang Junli,
Feng Ying,
Wang Tingting,
Qiao Yajie,
Chen Kangmin
Publication year - 2018
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800303
Subject(s) - amorphous solid , x ray photoelectron spectroscopy , semiconductor , lone pair , electron , crystallography , materials science , polyvinylpyrrolidone , binding energy , lewis acids and bases , chemical physics , chemistry , molecule , atomic physics , physics , organic chemistry , optoelectronics , nuclear magnetic resonance , polymer chemistry , quantum mechanics , catalysis
The bonded or nonbonded interactions at the interface of ligands and surface atoms are a core issue in engineering the surface chemistry and (photo)electronic properties of semiconductor colloidal solids. Herein, we demonstrate the interfacial Lewis acid‐base N→Sb nonbonded interaction: N atoms in polyvinylpyrrolidone (PVP) molecules acting as an electron donor to enhance the photoconductivity and ‐responsivity of PVP‐capped Sb 2 S 3 amorphous semiconductor colloids. The electron donation effect of PVP N atoms in the N→Sb interaction is backed by the upper shift of N 1s binding energy in the X‐ray photoelectron spectra (XPS) and the relevant literature. The repulsion of lone pair electrons (LPEs) of N atoms is thought to make 5 s 2 LPEs of Sb atoms retract from Sb nuclei with an increased orbital volume, giving rise to high probability for the overlap and coupling of 5 s 2 LPEs among neighboring Sb atoms on the surface of Sb 2 S 3 amorphous colloids. Such a spatially and energetically matched electron‐electron coupling greatly contributes to the photoelectronic performance enhancement of amorphous Sb 2 S 3 . We believe that the electron coupling and improved (photo)electronics can be generalized in many semiconductors containing n s 2 LPE metal cations by the surface/interface Lewis acid‐base interactions with suitable ligands.