A comprehensive optimization strategy: potassium phytate-doped SnO2 as the electron-transport layer for high-efficiency perovskite solar cells

For perovskite solar cells (PSCs), the electron transport layer (ETL) is a key component for the separation and transport of charge carriers. Also, the modulation of perovskite crystallization processes is important to obtain highly crystalline and stable perovskite films. Herein, we proposed a nove...

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Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 10; no. 19; pp. 7641 - 7650
Main Authors Zhao, Dengjie, Zhang, Chenxi, Zhao, Min, Ren, Jingkun, Dai, Zhen, Wu, Yukun, Sun, Qinjun, Cui, Yanxia, Hao, Yuying
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 14.04.2022
Subjects
Charge density
Crystal defects
Crystal structure
Crystallinity
Crystallization
Current carriers
Efficiency
Electron transport
Energy conversion efficiency
Energy levels
Optimization
Perovskites
Photovoltaic cells
Potassium
Solar cells
Stability
Tin dioxide
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Summary:For perovskite solar cells (PSCs), the electron transport layer (ETL) is a key component for the separation and transport of charge carriers. Also, the modulation of perovskite crystallization processes is important to obtain highly crystalline and stable perovskite films. Herein, we proposed a novel strategy, i.e. potassium phytate (PP)-doped SnO2 as the ETL. The incorporation of PP into the SnO2 ETL not only adjusts the electronic properties of SnO2 but also optimizes the energy level arrangement between SnO2 and the perovskite by passivating the Sn dangling bonds within SnO2. As a result, a better transport/extraction of electrons across the ETL and the ETL/perovskite interface is achieved. Meanwhile, the diffusible K+ cations from the hydrolytic PP fill the lattice defect sites in the perovskite and improve dramatically the crystallinity of the perovskite, and hence reduce the charge trap density of the perovskite and suppress the charge recombination loss. The power conversion efficiency (PCE) is enhanced from 20.14% to 22.14% for the champion PP–SnO2 PSCs relative to the pristine devices. In addition, the stability against humidity of the unencapsulated PSCs with the PP–SnO2 ETL is improved obviously compared to the pristine devices. This work provides a comprehensive optimization strategy for high efficiency and stability PSCs.
ISSN:2050-7526
2050-7534
DOI:10.1039/d2tc00882c