21.7% efficiency achieved in planar n–i–p perovskite solar cells via interface engineering with water-soluble 2D TiS2

In planar n–i–p perovskite solar cells (Pero-SCs), interfacial engineering plays a critically important role in charge extraction and transportation, and hence influences the photovoltaic performances. In this study, high performance Pero-SCs were realized by introducing SnO2/2D TiS2 double structur...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 11; pp. 6213 - 6219
Main Authors Huang, Peng, Chen, Qiaoyun, Zhang, Kaicheng, Yuan, Ligang, Zhou, Yi, Song, Bo, Li, Yongfang
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2019
Subjects
Absorption spectra
Electron transport
Energy conversion efficiency
Energy levels
Engineering
Optimization
Perovskites
Photovoltaic cells
Photovoltaics
Solar cells
Time dependence
Tin dioxide
Transportation
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Summary:In planar n–i–p perovskite solar cells (Pero-SCs), interfacial engineering plays a critically important role in charge extraction and transportation, and hence influences the photovoltaic performances. In this study, high performance Pero-SCs were realized by introducing SnO2/2D TiS2 double structures as electron transport layers (ETLs). The highest power conversion efficiency (PCE) reached 21.73% (average PCE is 20.48 ± 0.50%) with quite small hysteresis. The improvement of performance is mainly attributed to the facilitated charge transportation due to the match of energy levels and decreased electron trap state densities of ETL films. This work provides not only a promising interfacial material, but also a feasible clue to alleviate the trap states of SnO2 in planar n–i–p Pero-SCs.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta11841h