Modulating titanium dioxide electron transport layer by self-doping for high-efficiency carbon-based perovskite solar cells

Xin Peng; Rong Huang; Wenran Wang; Jianxin Zhang; Zhenxiao Pan; Yueping Fang; Huashang Rao; Xinhua Zhong; Guizhi Zhang

doi:10.1016/j.cjche.2025.03.022

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Modulating titanium dioxide electron transport layer by self-doping for high-efficiency carbon-based perovskite solar cells

Updated：2026-01-06

- Modulating titanium dioxide electron transport layer by self-doping for high-efficiency carbon-based perovskite solar cells
- Chinese Journal of Chemical Engineering Vol. 85, Issue 9, Pages: 348-354(2025)
- Affiliations：
  
  Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University,Guangzhou,China,510642
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2025.03.022
  CLC：
- Published：2025
- Accepted：
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Xin Peng, Rong Huang, Wenran Wang, Jianxin Zhang, Zhenxiao Pan, Yueping Fang, Huashang Rao, Xinhua Zhong, Guizhi Zhang. Modulating titanium dioxide electron transport layer by self-doping for high-efficiency carbon-based perovskite solar cells[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 348-354.
DOI：

Xin Peng, Rong Huang, Wenran Wang, Jianxin Zhang, Zhenxiao Pan, Yueping Fang, Huashang Rao, Xinhua Zhong, Guizhi Zhang. Modulating titanium dioxide electron transport layer by self-doping for high-efficiency carbon-based perovskite solar cells[J]. Chinese Journal of Chemical Engineering, 2025, 85(9): 348-354. DOI： 10.1016/j.cjche.2025.03.022.

摘要

Abstract

In perovskite solar cells (PSCs)

it is important to construct electron transport layer (ETL) with ideal surface morphology and advantageous electron transport dynamics. In this work

a functional TiO

ETL is designed and constructed based on a novel Ti

self-doping strategy. Experimental results indicate that Ti

dopant can optimize TiO

film crystallization process by facilitating the assembly of precursor particles

reducing the content of pore-forming reagent

and enhancing the adhesion of precursors to glass substrate in film formation process. Therefore

the modified surface morphology inhibits the formation of undesired hole structure. Besides

self-doping moderately generates oxygen vacancies on TiO

surface and a shallower TiO

Fermi energy level. These not only result in a stronger interfacial electronic coupling

but also establish an advantageous energy band alignment. These merits optimize interfacial electron transfer dynamics by inhibiting recombination loss and facilitating electron extraction. Benefiting from the optimized TiO

ETL

hole transport layer (HTL)-free carbon electrode based CsPbI

PSCs deliver a high efficiency of 18.62%

representing one of the highest levels in this field.

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