Issue 12, 2023

Interlayer engineering via alkaline hypophosphates for efficient and air-stable perovskite solar cells

Abstract

The energy level mismatch and unfavorable interfacial reaction between nickel oxide (NiOx) and organic cations of the perovskite are the main factors affecting the power conversion efficiency (PCE) of inverted perovskite solar cells. Herein, interlayer engineering via dual-functional alkaline hypophosphite is introduced between the nickel oxide hole transport layer (HTL) and the perovskite layer. The introduction of alkaline hypophosphite deepens the valence band maximum of NiOx, which better aligns the energy band of perovskite solar cells with the best energy level matching using sodium hypophosphite. In addition, the deposition of alkaline sodium hypophosphite on NiOx reduces the proportion of Ni3+ and slows down the accelerated degradation of the perovskite layer caused by the reaction of excess Ni3+ with organic cations in the perovskite. The open-circuit voltage (VOC) of devices treated with sodium hypophosphite increased from 1.01 to 1.08 eV with a power conversion efficiency of 19.92%. Moreover, the unencapsulated devices retained 80% efficiency for 1000 hours under ambient conditions (50–60% relative humidity), and demonstrate a feasible and effective strategy for the fabrication of efficient and air-stable inverted perovskite solar cells.

Graphical abstract: Interlayer engineering via alkaline hypophosphates for efficient and air-stable perovskite solar cells

Supplementary files

Article information

Article type
Research Article
Submitted
30 Jan 2023
Accepted
13 Mar 2023
First published
15 Mar 2023

Mater. Chem. Front., 2023,7, 2426-2435

Interlayer engineering via alkaline hypophosphates for efficient and air-stable perovskite solar cells

J. Peng, Q. Wu, H. Hou, T. Hu, Y. Huang, X. Cai, W. Luo, X. Chen and H. Yu, Mater. Chem. Front., 2023, 7, 2426 DOI: 10.1039/D3QM00103B

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