Green low-temperature-solution-processed in situ HI modified TiO2/SnO2 bilayer for efficient and stable planar perovskite solar cells build at ambient air conditions

Planar structures for halide perovskite solar cells with the high efficiencies typically use high-temperature processed TiO2 as the electron transporting layers (ETLs). Here, we demonstrate that an in-situ passivation strategy for TiO2 film through the introduction of HI during low-temperature prepa...

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Bibliographic Details
Published in:Electrochimica acta 2019-12, Vol.326, p.134924, Article 134924
Main Authors: Deng, Yaxin, Li, Shuxian, Li, Xuandong, Wang, Rui, Li, Xin
Format: Article
Language:English
Subjects:
Ambient condition
Electron transfer
Electron transfer layer
Electron transport
Energy conversion efficiency
High temperature
Low temperature
Maximum power
Perovskite solar cell
Perovskites
Photovoltaic cells
Planar structures
Solar cells
Stability
Tin dioxide
TiO2/SnO2
Titanium dioxide
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Summary:Planar structures for halide perovskite solar cells with the high efficiencies typically use high-temperature processed TiO2 as the electron transporting layers (ETLs). Here, we demonstrate that an in-situ passivation strategy for TiO2 film through the introduction of HI during low-temperature preparation process. HI not only controls hydrolysis of TiO2 precursor but also eliminates defects and suppresses trap states in TiO2 film. Meanwhile, the double-layer architecture is constructed by coating TiO2 with SnO2 layer, the double ETLs can improve the photovoltaic performance of methylamine lead iodide (MAPbI3) perovskite solar cells. The TiO2(HI)/SnO2 ETL can effectively reduce the interfacial charge recombination and facilitate electron transfer. More importantly, the preparation of TiO2 and SnO2 are totally performed at low-temperature (150 °C) and the devices are fabricated in uncontrolled ambient conditions. Our best-performing planar perovskite cell using such a TiO2(HI)/SnO2 ETL has achieved a maximum power conversion efficiency (PCE) of 16.74%, and the devices exhibit good stability which maintaining 85% and 83% of their initial efficiency after heating at 100 °C for 22 h and under illuminating upon 1 sun irradiation for 6 h, respectively. Our results suggest a new approach for further improving the stability of PSCs fabricated in the air condition.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.134924