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research article

Hydroxamic acid pre-adsorption raises the efficiency of cosensitized solar cells

Ren, Yameng  
•
Zhang, Dan  
•
Suo, Jiajia  
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2023
Nature

Dye-sensitized solar cells (DSCs) convert light into electricity by using photosensitizers adsorbed on the surface of nanocrystalline mesoporous titanium dioxide (TiO2) films along with electrolytes or solid charge-transport materials(1-3). They possess many features including transparency, multicolour and low-cost fabrication, and are being deployed in glass facades, skylights and greenhouses(4). Recent development of sensitizers(5-10), redox mediators(11-13) and device structures(14) has improved the performance of DSCs, particularly under ambient light conditions(14-17). To further enhance their efficiency, it is pivotal to control the assembly of dye molecules on the surface of TiO2 to favour charge generation. Here we report a route of pre-adsorbing a monolayer of a hydroxamic acid derivative on the surface of TiO2 to improve the dye molecular packing and photovoltaic performance of two newly designed co-adsorbed sensitizers that harvest light quantitatively across the entire visible domain. The best performing cosensitized solar cells exhibited a power conversion efficiency of 15.2% (which has been independently confirmed) under a standard air mass of 1.5 global simulated sunlight, and showed long-term operational stability (500 h). Devices with a larger active area of 2.8 cm(2) exhibited a power conversion efficiency of 28.4% to 30.2% over a wide range of ambient light intensities, along with high stability. Our findings pave the way for facile access to high-performance DSCs and offer promising prospects for applications as power supplies and battery replacements for low-power electronic devices(18-20) that use ambient light as their energy source.

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Type
research article
DOI
10.1038/s41586-022-05460-z
Web of Science ID

WOS:000895812700001

Author(s)
Ren, Yameng  
•
Zhang, Dan  
•
Suo, Jiajia  
•
Cao, Yiming  
•
Eickemeyer, Felix T.  
•
Vlachopoulos, Nick  
•
Zakeeruddin, Shaik M.  
•
Hagfeldt, Anders  
•
Graetzel, Michael  
Date Issued

2023

Publisher

NATURE PORTFOLIO

Published in
Nature
Volume

613

Start page

60

End page

65

Subjects

Multidisciplinary Sciences

•

Science & Technology - Other Topics

•

dye

•

tio2

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
January 16, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/193790
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