Issue 6, 2020

Interface modification of sputtered NiOx as the hole-transporting layer for efficient inverted planar perovskite solar cells

Abstract

Nickel oxide (NiOx) as a hole-transporting layer (HTL) in perovskite solar cells (PSCs) has been studied extensively in recent years. However, unlike the solution-processed NiOx films, magnetron sputtered NiOx exhibits relatively low conductivity and imperfect band alignment with perovskites, severely limiting the device performance of PSCs. In this study, a synergistically combined strategy consisting of triple interface treatments – including post-annealing, O2-plasma, and potassium chloride treatments – is employed to modulate the optoelectronic properties of the sputtered NiOx films. Through this approach, we successfully obtained NiOx films with increased carrier density and conductivity, better energy level alignment with the perovskite absorber layer, reduced interface trap density, and improved interfacial charge extraction. PSCs using this modified sputtered NiOx as the HTL deliver a highest stabilized efficiency of 18.7%. Our result offers an alternative method to manipulate sputtered NiOx thin film properties and thereby sheds light on a manufacturing pathway to perovskite solar cells featuring sputtered NiOx HTL.

Graphical abstract: Interface modification of sputtered NiOx as the hole-transporting layer for efficient inverted planar perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
21 10 2019
Accepted
15 12 2019
First published
19 12 2019

J. Mater. Chem. C, 2020,8, 1972-1980

Author version available

Interface modification of sputtered NiOx as the hole-transporting layer for efficient inverted planar perovskite solar cells

X. Zheng, Z. Song, Z. Chen, S. S. Bista, P. Gui, N. Shrestha, C. Chen, C. Li, X. Yin, R. A. Awni, H. Lei, C. Tao, R. J. Ellingson, Y. Yan and G. Fang, J. Mater. Chem. C, 2020, 8, 1972 DOI: 10.1039/C9TC05759E

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