Nickel Oxide Thin Films Formed from the pH-Adjusted Solutions for Inverted Perovskite Solar Cells

Yun Sung Jeon; Nam Gyu Park

doi:10.1021/acsenergylett.4c03427

Nickel Oxide Thin Films Formed from the pH-Adjusted Solutions for Inverted Perovskite Solar Cells

Yun Sung Jeon
, Nam Gyu Park

Department of Chemical Engineering

Sungkyunkwan University

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We report here a facile approach for fabricating a p-type nickel oxide (NiO_x) thin film for inverted perovskite solar cells (PSCs) by a direct conversion of the pH-adjusted aqueous precursor solutions into solid NiO_x. pH control influenced both the p-type characteristics of the NiO_x film and the phase stability of the perovskite layer deposited on the NiO_x film. Formic acid (HCOOH) increased the Ni³⁺/(Ni²⁺ + Ni³⁺) ratio from 4.65% to 5.77%, enhancing charge extraction capability, while ammonium hydroxide reduced it to 4.13%. The HCOOH-derived NiO_x films also improved the perovskite stability by eliminating residual nitrates. As a result, under ISOS-L1 conditions, the T₉₀ lifespan (90% of the initial efficiency) was extended to 900 h, compared to less than 200 h for other films. A power conversion efficiency of 24.19% was achieved by using the HCOOH-derived NiO_x film with carbazole-based phosphonic acid passivation.

Original language	English
Pages (from-to)	1266-1274
Number of pages	9
Journal	ACS Energy Letters
Volume	10
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.4c03427
State	Published - 14 Mar 2025

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title = "Nickel Oxide Thin Films Formed from the pH-Adjusted Solutions for Inverted Perovskite Solar Cells",

abstract = "We report here a facile approach for fabricating a p-type nickel oxide (NiOx) thin film for inverted perovskite solar cells (PSCs) by a direct conversion of the pH-adjusted aqueous precursor solutions into solid NiOx. pH control influenced both the p-type characteristics of the NiOx film and the phase stability of the perovskite layer deposited on the NiOx film. Formic acid (HCOOH) increased the Ni3+/(Ni2+ + Ni3+) ratio from 4.65\% to 5.77\%, enhancing charge extraction capability, while ammonium hydroxide reduced it to 4.13\%. The HCOOH-derived NiOx films also improved the perovskite stability by eliminating residual nitrates. As a result, under ISOS-L1 conditions, the T90 lifespan (90\% of the initial efficiency) was extended to 900 h, compared to less than 200 h for other films. A power conversion efficiency of 24.19\% was achieved by using the HCOOH-derived NiOx film with carbazole-based phosphonic acid passivation.",

author = "Jeon, \{Yun Sung\} and Park, \{Nam Gyu\}",

note = "Publisher Copyright: {\textcopyright} 2025 American Chemical Society.",

year = "2025",

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doi = "10.1021/acsenergylett.4c03427",

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T1 - Nickel Oxide Thin Films Formed from the pH-Adjusted Solutions for Inverted Perovskite Solar Cells

AU - Jeon, Yun Sung

AU - Park, Nam Gyu

PY - 2025/3/14

Y1 - 2025/3/14

N2 - We report here a facile approach for fabricating a p-type nickel oxide (NiOx) thin film for inverted perovskite solar cells (PSCs) by a direct conversion of the pH-adjusted aqueous precursor solutions into solid NiOx. pH control influenced both the p-type characteristics of the NiOx film and the phase stability of the perovskite layer deposited on the NiOx film. Formic acid (HCOOH) increased the Ni3+/(Ni2+ + Ni3+) ratio from 4.65% to 5.77%, enhancing charge extraction capability, while ammonium hydroxide reduced it to 4.13%. The HCOOH-derived NiOx films also improved the perovskite stability by eliminating residual nitrates. As a result, under ISOS-L1 conditions, the T90 lifespan (90% of the initial efficiency) was extended to 900 h, compared to less than 200 h for other films. A power conversion efficiency of 24.19% was achieved by using the HCOOH-derived NiOx film with carbazole-based phosphonic acid passivation.

AB - We report here a facile approach for fabricating a p-type nickel oxide (NiOx) thin film for inverted perovskite solar cells (PSCs) by a direct conversion of the pH-adjusted aqueous precursor solutions into solid NiOx. pH control influenced both the p-type characteristics of the NiOx film and the phase stability of the perovskite layer deposited on the NiOx film. Formic acid (HCOOH) increased the Ni3+/(Ni2+ + Ni3+) ratio from 4.65% to 5.77%, enhancing charge extraction capability, while ammonium hydroxide reduced it to 4.13%. The HCOOH-derived NiOx films also improved the perovskite stability by eliminating residual nitrates. As a result, under ISOS-L1 conditions, the T90 lifespan (90% of the initial efficiency) was extended to 900 h, compared to less than 200 h for other films. A power conversion efficiency of 24.19% was achieved by using the HCOOH-derived NiOx film with carbazole-based phosphonic acid passivation.

UR - https://www.scopus.com/pages/publications/85219681765

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DO - 10.1021/acsenergylett.4c03427

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SP - 1266

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JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 3

ER -

Nickel Oxide Thin Films Formed from the pH-Adjusted Solutions for Inverted Perovskite Solar Cells

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