Quantum Dot-Siloxane Anchoring on Colloidal Quantum Dot Film for Flexible Photovoltaic Cell

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Lead sulfide (PbS) colloidal quantum dots (CQDs) are promising materials for next-generation flexible solar cells because of near-infrared absorption, facile bandgap tunability, and superior air stability. However, CQD devices still lack enough flexibility to be applied to wearable devices owing to the poor mechanical properties of CQD films. In this study, a facile approach is proposed to improve the mechanical stability of CQDs solar cells without compromising the high power conversion efficiency (PCE) of the devices. (3-aminopropyl)triethoxysilane (APTS) is introduced on CQD films to strengthen the dot-to-dot bonding via QD-siloxane anchoring, and as a result, crack pattern analysis reveals that the treated devices become robust to mechanical stress. The device maintains 88% of the initial PCE under 12 000 cycles at a bending radius of 8.3 mm. In addition, APTS forms a dipole layer on CQD films, which improves the open circuit voltage (V-OC) of the device, achieving a PCE of 11.04%, one of the highest PCEs in flexible PbS CQD solar cells.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2023-10
Language
English
Article Type
Article
Citation

SMALL, v.19, no.41

ISSN
1613-6810
DOI
10.1002/smll.202302195
URI
http://hdl.handle.net/10203/313578
Appears in Collection
ME-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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