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Supramolecular Coordination of Pb 2+ Defects in Hybrid Lead Halide Perovskite Films Using Truxene Derivatives as Lewis Base Interlayers
Author(s) -
Aktas Ece,
JiménezLópez Jesús,
RodríguezSeco Cristina,
Pudi Rajesh,
Ortuño Manuel A.,
López Núria,
Palomares Emilio
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900068
Subject(s) - perovskite (structure) , passivation , halide , supramolecular chemistry , materials science , photocurrent , molecule , thin film , nucleation , photochemistry , chemistry , nanotechnology , optoelectronics , crystallography , inorganic chemistry , organic chemistry , layer (electronics)
Truxene derivatives, due to their molecular structure and properties, are good candidates for the passivation of defects when deposited onto hybrid lead halide perovskite thin films. Moreover, their semiconductor characteristics can be tailored through the modification of their chemical structure, which allows‐upon light irradiation‐ the interfacial charge transfer between the perovskite film and the truxene molecules. In this work, we analysed the use of the molecules as surface passivation agents and their use in complete functional solar cells. We observed that these molecules reduce the non‐radiative carrier recombination dynamics in the perovskite thin film through the supramolecular complex formation between the Truxene molecule and the Pb 2+ defects at the perovskite surface. Interestingly, this supramolecular complexation neither affect the carrier recombination kinetics nor the carriers collection but induced noticeable hysteresis on the photocurrent vs voltage curves of the solar cells under 1 sun illumination.