posted on 2024-02-15, 21:30authored byMuhammad Munir, Ramis Arbi, Jinglan Tan, Pedro Oliveira, Seung Il Lee, Markus Clark Scharber, Niyazi Serdar Sariciftci, Fan Xu, Gu Xu, Ayse Turak
Using the reverse micelle synthesis route, polystyrene-b-2vinylpyridine
(PS-b-P2VP) diblock copolymers are used to synthesize hybrid perovskite
nanoparticles with an ionic organic liquid five-membered heterocycle
cation, pyrrolidinium (Py) (C4H8NH). Uniform,
well-dispersed, and luminescent nanoparticles were fabricated with
high stability due to the hydrophobic nature of Py and polymer encapsulation.
The substitution of bromine for iodine induces a bathochromic shift,
resulting in a substantial Stokes shift of 764 meV (211 nm) for mixed
halide phase nanoparticles, contrary to the anticipated hypsochromic
shift with bromine doping. This unique attribute of Py-based perovskites
positions them as promising candidates for down-conversion applications
in low-band-gap organic solar cells. Incorporating Py-based perovskite
nanoparticles into bulk heterojunction organic photovoltaics (OPVs)
as down-conversion layers selectively enhances the short-circuit current
from UV components in the illumination source. The observed improvements
in stability, uniformity, and luminescence, coupled with the distinct
Stokes shift, underscore the potential of Py-based perovskite nanoparticles
as a valuable component in improving the efficiency of OPVs.