The commonly used long-chain ligands in CsPbBr3 quantum
dots (QDs) hinder the electronic coupling and charge transport in
optoelectronic devices; therefore, surface ligand management is crucial
to optimize device performance. In this report, we demonstrate a simple
and feasible aromatic carboxylic acid ligand management to obtain
high-efficiency CsPbBr3 QD light-emitting solar cells (LESCs).
Benzoic acid (BA) is used to replace the excess insulating ligands
so that the charge transport of QD films is greatly improved, and
the trap-assisted nonradiative recombination is also effectively inhibited.
Consequently, the CsPbBr3 QD LESCs yield an enhanced power
conversion efficiency (PCE) of 5.46% for the champion device and function
as green light-emitting diodes (LEDs) with a maximum brightness of
584 cd/m2. This work sheds light on the ligand management
in perovskite QDs and provides a new avenue to realize high-performance
multifunctional optoelectronic devices based on perovskite QDs.
Lead halide perovskite film exhibits excellent optoelectronic properties, while the currently most common preparing method usually needs a conductive-annealing process, which inevitably leads to residual strain and defect, hindering the...
The perovskite/hole-transporting layer interface plays a crucial role on the performance of perovskite solar cells. Herein, a conjugated polymer (CP) is employed as an interface layer in CsPbIBr2 solar cells....
Methyl acetate (MeOAc) is the most used antisolvent in the preparation of perovskite quantum dot (QD) films. However, the hydrolysis of MeOAc results in acetic acid and methanol (MeOH), and...
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