Self-Healing Significantly Improves Performances of NiO Sputtered n-i-p Perovskite Solar Cells

Basak, S and Ghosh, S and Pariari, D and Jangid, T and Behera, T and Boix, PP and Mora-Seró, I and Chowdhury, A and Sarma, DD and Sarkar, SK (2024) Self-Healing Significantly Improves Performances of NiO Sputtered n-i-p Perovskite Solar Cells. In: ACS Energy Letters . pp. 6117-6125.

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Abstract

Using radio frequency magnetron sputter deposition to apply metal oxide thin film as a hole transporting layer (HTL) onto a halide perovskite layer significantly compromises the device photovoltaic performance. Therefore, despite its economic advantages and scalability potential, this method is generally not favored. Herein, we identify the primary cause of this limitation as the loss of the organic moiety from the near-interface region during the sputter deposition of NiO onto the halide perovskite and the consequent generation of interfacial defects. Furthermore, we show that a self-healing process, without any external intervention, is able to significantly compensate for the adverse effects of the sputtering process, resulting in the device efficiency to 180-220 of its initial value and leading to the highest-ever power conversion efficiency (PCE) reported for an n-i-p device with a sputtered NiO HTL. Employing optical and impedance spectroscopies, we investigate the mechanism of this self-healing process, establishing the dynamics of the process to be thermally controlled and independent of the storage ambient, indicating the diffusion of the ionic species from the bulk to the interface as the driving force for the recovery. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Energy Letters
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the Publisher.
Keywords:	Indium phosphide; Magnetron sputtering; Metal halides; Solar power generation; Sputter deposition, Halide perovskites; Hole transporting layers; Improve performance; Magnetron sputter deposition; Metal oxide thin films; Perovskite layers; Photovoltaic performance; Radiofrequencies; Self-healing; Self-healing process, Perovskite
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	21 Dec 2024 04:02
Last Modified:	21 Dec 2024 04:02
URI:	http://eprints.iisc.ac.in/id/eprint/87140

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