Addressing the stability challenge of perovskite solar cells
Lianzhou Wang a
a The University of Queensland, Bld 68, Level 9, Cooper Rd., Brisbane, 4072, Australia
Proceedings of International Online Conference on Hybrid Materials and Optoelectronic Devices (HYBRIDOE21)
Online, Spain, 2021 December 15th - 17th
Organizers: Jinwei Gao, Hua Yu, Dewei Zhao, Haizheng Zhong, Hairen Tan and Xueqing Xu
Keynote, Lianzhou Wang, presentation 015
Publication date: 3rd December 2021

Halide Perovskite solar cells have attracted much recent interest because of their high power conversion efficiency and low fabrication cost. However, perovskite materials suffer from some significant challenges including long term stability issue before the solar cells can be practically used at large scale. Herein we report our recent progress in addressing the stability of perovskite solar cells, including introduction of capping layers to improve the stability against moisture and heat, down-conversion elemental doping to protect from UV damage, and perovskite size engineering to suppress phase segregation. In particular, quantum dots (QDs) have the advantages of quantum confinement effect, defect-tolerant nature, and the capability of developing stable lightweight and flexible films, we will discuss our recent progress on a novel surface ligand engineering strategy in designing new hybrid perovskite QDs, which leads to not only fundamental understanding on the optoelectronic working mechanism of the QDs, but also remarkably improve the optoelectronic quality and stability of the perovskite QDs. The new classes of perovskite quantum dots have been used as building blocks in Quantum Dot Solar Cells with a certified world record efficiency of 16.6% ( with excellent long-term operation stability. By using QDs as light absorbing materials, the QD based photocatalysts also exhibited good stable performance in photocatalytic gaseous hydrogen production. The integration of perovskite solar cells and rechargeable batteries have led to a single module type rechargeable solar batteries with an overall storable solar energy conversion efficiency of >12%.

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