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5 years ago

TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell
Bangkai Gu, Wei Tian, Hao Lu, Liang Li, Yayun Zhu
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. The TiO2 bilayers with different energy band alignments are fabricated by combing atomic layer deposition and 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.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701535

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