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  4. Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency
 
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research article

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

Yella, Aswani  
•
Heiniger, Leo-Philipp  
•
Gao, Peng  
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2014
Nano Letters

We demonstrate low-temperature (70 degrees C) solution processing of TiO2/CH3NH3PbI3 based solar cells, resulting in impressive power conversion efficiency (PCE) of 13.7%. Along with the high efficiency, a strikingly high open circuit potential (V-OC) of 1110 mV was realized using this low-temperature chemical bath deposition approach. To the best of our knowledge, this is so far the highest V-OC value for solution-processed TiO2/CH3NH3PbI3 solar cells. We deposited a nanocrystalline TiO2 (rutile) hole-blocking layer on a fluorine-doped tin oxide (FTO) conducting glass substrate via hydrolysis of TiCl4 at 70 degrees C, forming the electron selective contact with the photoactive CH3NH3PbI3 film. We find that the nanocrystalline rutile TiO2 achieves a much better performance than a planar TiO2 (anatase) film prepared by high-temperature spin coating of TiCl4, which produces a much lower PCE of 3.7%. We attribute this to the formation of an intimate junction of large interfacial area between the nanocrystalline rutile TiO2 and the CH3NH3PbI3 layer, which is much more effective in extracting photogenerated electrons than the planar anatase film. Since the complete fabrication of the solar cell is carried out below 100 degrees C, this method can be easily extended to plastic substrates.

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Type
research article
DOI
10.1021/nl500399m
Web of Science ID

WOS:000336074800055

Author(s)
Yella, Aswani  
•
Heiniger, Leo-Philipp  
•
Gao, Peng  
•
Nazeeruddin, Mohammad Khaja  
•
Graetzel, Michael  
Date Issued

2014

Publisher

American Chemical Society

Published in
Nano Letters
Volume

14

Issue

5

Start page

2591

End page

2596

Subjects

Chemical bath deposition

•

titanium dioxide

•

solar cells

•

perovskite absorber

•

CH3NH3PbI3

•

low-temperature fabrication

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
June 23, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/104614
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