TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

In planar perovskite solar cells, it is vital to engineer the extraction and recombination of electron–hole pairs at the electron transport layer/perovskite interface for obtaining high performance. This study reports a novel titanium oxide (TiO2) bilayer with different Fermi energy levels by combin...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2017-10, Vol.13 (38), p.n/a
Main Authors: Lu, Hao, Tian, Wei, Gu, Bangkai, Zhu, Yayun, Li, Liang
Format: Article
Language:English
Subjects:
atomic layer deposition
Atomic layer epitaxy
band alignment
Construction planning
Electron transport
electron transport layer
Energy levels
Extraction
Fermi surfaces
Nanotechnology
Nuclear electric power generation
perovskite solar cells
Photovoltaic cells
Solar cells
Titanium dioxide
titanium oxide
Titanium oxides
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Summary:In planar perovskite solar cells, it is vital to engineer the extraction and recombination of electron–hole pairs at the electron transport layer/perovskite interface for obtaining high performance. This study reports a novel titanium oxide (TiO2) bilayer with different Fermi energy levels by combing atomic layer deposition and spin‐coating technique. Energy band alignments of TiO2 bilayer can be modulated by controlling the deposition order of layers. The TiO2 bilayer based perovskite solar cells are highly efficient in carrier extraction, recombination suppression, and defect passivation, and thus demonstrate champion efficiencies up to 16.5%, presenting almost 50% enhancement compared to the TiO2 single layer based counterparts. The results suggest that the bilayer with type II band alignment as electron transport layers provides an efficient approach for constructing high‐performance planar perovskite solar cells. TiO2 bilayers with different energy band alignments are fabricated by combing atomic layer deposition and a spin‐coating technique. Perovskite solar cells based on TiO2 electron transport bilayers are highly efficient in carrier extraction, recombination suppression, and defect passivation, and thus demonstrate champion efficiency up to 16.5%, which is almost 50% enhancement compared to the TiO2 single layer based counterparts.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201701535