Issue 42, 2021

High-quality borophene quantum dot realization and their application in a photovoltaic device

Abstract

Surface modification is an effective strategy to promote charge transport and extraction, reduce the carrier recombination probability, and ultimately improve the performance of perovskite solar cells (PSCs). Borophene is the lightest two-dimensional (2D) layered material, with high carrier mobility and high hardness. In this work, a sonication-assisted liquid-phase preparation technique was developed to prepare borophene quantum dots (BQDs) with uniform size, good dispersion, and high stability. The use of BQDs as a surface passivation agent on the TiO2 layer in an inorganic CsPbI2Br solar cell was presented. It is found that the boron atoms undergo strong interactions with TiO2 and the perovskite, reducing interfacial recombination and forming a cascade energy alignment for effective charge transport. A CsPbI2Br solar cell with a thin BQD interlayer shows high efficiency of 15.31%, whereas the efficiency was 14.24% for the device with no BQDs. The enhancement in efficiency is mainly due to carrier recombination suppression and a decrease in the defect density at the TiO2/CsPbI2Br interface after BDQ treatment. This work demonstrates that high-quality BQDs have great potential to be applied in perovskite solar cells and other optoelectronic devices.

Graphical abstract: High-quality borophene quantum dot realization and their application in a photovoltaic device

Supplementary files

Article information

Article type
Paper
Submitted
02 Aug 2021
Accepted
26 Sep 2021
First published
28 Sep 2021

J. Mater. Chem. A, 2021,9, 24036-24043

High-quality borophene quantum dot realization and their application in a photovoltaic device

A. Zhao, Y. Han, Y. Che, Q. Liu, X. Wang, Q. Li, J. Sun, Z. Lei, X. He and Z. Liu, J. Mater. Chem. A, 2021, 9, 24036 DOI: 10.1039/D1TA06524F

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