Issue 9, 2023

Iodide/triiodide redox shuttle-based additives for high-performance perovskite solar cells by simultaneously passivating the cation and anion defects

Abstract

Halide perovskite solar cells (PSCs) have received remarkably increasing interests due to their facile fabrication procedures, use of cost-effective raw materials, and high power conversion efficiencies (PCEs) during the past 10 years. Nevertheless, the state-of-the-art organic–inorganic PSCs suffer from high defect concentration and inferior humid/thermal stability, significantly restricting the widespread applications of PSCs. More specifically, point defects including metallic lead (Pb0) and halide iodine (I0) are easily generated in Pb/I-based PSCs during fabrication processes and operational conditions due to the inferior interaction between the anions and cations in halide perovskites and promote detrimental carrier recombination and ion migration, leading to inferior PCEs and durability of the PSCs. Herein, to tackle the above-mentioned issues, iodide/triiodide (I/I3) redox shuttles as a new additive were introduced to simultaneously passivate the cation and anion defects of methylammonium lead iodide (MAPbI3)-based PSCs. In particular, I/I3 redox shuttles play a vital role in regenerating the cation (Pb0) and anion (I0) defects through the redox cycles of Pb0/Pb2+ and I0/I. Consequently, the cell with an optimized amount of I/I3 additive generated a superior PCE of 20.4%, which was 12% higher than the pristine device (18.2%). Furthermore, the introduction of the I/I3 additive remarkably improved the humid and thermal stability of MAPbI3-based PSCs. This work manifests the importance of the design of redox shuttle-based additives to boost the efficiency and durability of organic–inorganic PSCs.

Graphical abstract: Iodide/triiodide redox shuttle-based additives for high-performance perovskite solar cells by simultaneously passivating the cation and anion defects

Supplementary files

Article information

Article type
Paper
Submitted
01 12 2022
Accepted
30 1 2023
First published
31 1 2023

Nanoscale, 2023,15, 4344-4352

Iodide/triiodide redox shuttle-based additives for high-performance perovskite solar cells by simultaneously passivating the cation and anion defects

H. Xiang, J. He, R. Ran, W. Zhou, W. Wang and Z. Shao, Nanoscale, 2023, 15, 4344 DOI: 10.1039/D2NR06710B

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