Room-temperature processed TiO2 to construct composite electron transport layers for efficient planar perovskite solar cells

Jiaduo Wang; Zhuo Dong; Jiajun Wang; Junwei Zhang; Zeyu Zhai; Fazheng Qiu; Jinpeng Wu; Yuan Lin; Jingbo Zhang

doi:10.1039/D3TA03433J

Room-temperature processed TiO₂ to construct composite electron transport layers for efficient planar perovskite solar cells†

Jiaduo Wang,‡^a Zhuo Dong,‡^a Jiajun Wang,

^a Junwei Zhang,^a Zeyu Zhai,^a Fazheng Qiu,^c Jinpeng Wu,

*^b Yuan Lin

^b and Jingbo Zhang*^a

Author affiliations

* Corresponding authors

^a Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China
E-mail: hxxyzjb@tjnu.edu.cn

^b Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
E-mail: wujinpeng@iccac.ac.cn

^c School of Materials Science and Engineering, NingboTech University, Ningbo, P. R. China

Abstract

The power conversion efficiency (PCE) of perovskite solar cells (PSCs) is seriously affected by the conductivity and energy alignment of the electron transport layer (ETL). However, poor film quality leads to low conductivity and interface energy level mismatch, which limits the performance of PSCs. Herein, a simple room-temperature (<35 °C) method is used to produce high-quality amorphous TiO₂ thin films by vacuum ultraviolet (VUV) light (172 nm), to form composite ETLs with SnO₂ for PSCs. The introduction of TiO₂ produced perovskite films with larger grains and low trap density. The experimental results and density functional theory (DFT) analysis show that the composite ETL structure improves the electron mobility and conductivity, and the interaction with SnO₂ accelerates the electron extraction due to favorable energy level alignment with the perovskite layer. Eventually, the composite ETL-based PSCs obtain a champion PCE of 24.59% (certified efficiency of 24.24%) and retain 92.4% of their initial PCE after 500 h of continuous light exposure.

This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers

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Article information

DOI: https://doi.org/10.1039/D3TA03433J
Article type: Paper
Submitted: 10 Jun 2023
Accepted: 06 Sep 2023
First published: 07 Sep 2023

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J. Mater. Chem. A, 2023,11, 22206-22215

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Room-temperature processed TiO₂ to construct composite electron transport layers for efficient planar perovskite solar cells

J. Wang, Z. Dong, J. Wang, J. Zhang, Z. Zhai, F. Qiu, J. Wu, Y. Lin and J. Zhang, J. Mater. Chem. A, 2023, 11, 22206 DOI: 10.1039/D3TA03433J

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Journal of Materials Chemistry A