1 research outputs found
CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> Quantum Dot-Induced Nucleation for High Performance Perovskite Light-Emitting Solar Cells
Solution-processed
organometallic halide perovskites have obtained rapid development
for light-emitting diodes (LEDs) and solar cells (SCs). These devices
are fabricated with similar materials and architectures, leading to
the emergence of perovskite-based light-emitting solar cells (LESCs).
The high quality perovskite layer with reduced nonradiative recombination
is crucial for achieving a high performance device, even though the
carrier behaviors are fundamentally different in both functions. Here
CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> quantum dots (QDs) are
first introduced into the antisolvent in solution phase, serving as
nucleation centers and inducing the growth of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> films. The heterogeneous nucleation based
on high lattice matching and a low free-energy barrier significantly
improves the crystallinity of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> films with decreased grain sizes, resulting in longer carrier
lifetime and lower trap-state density in the films. Therefore, the
LESCs based on the CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> films
with reduced recombination exhibit improved electroluminescence and
external quantum efficiency. The current efficiency is enhanced by
1 order of magnitude as LEDs, and meanwhile the power conversion efficiency
increases from 14.49% to 17.10% as SCs, compared to the reference
device without QDs. Our study provides a feasible method to grow high
quality perovskite films for high performance optoelectronic devices