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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
- Source :
- Electrochimica Acta. 326:134924
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- 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.
- Subjects :
- Materials science
Passivation
business.industry
General Chemical Engineering
Bilayer
Photovoltaic system
Energy conversion efficiency
Halide
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Electron transfer
Coating
Electrochemistry
engineering
Optoelectronics
0210 nano-technology
business
Perovskite (structure)
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 326
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........2052324338947bec74ab9f7dd0526223
- Full Text :
- https://doi.org/10.1016/j.electacta.2019.134924