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Open AccessFeature PaperArticle

Ligand-Length Modification in CsPbBr3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance

1
UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, 46071 Valencia, Spain
2
Intenanomat SL, Catedrático José Beltrán 2, 46980 Paterna, Spain
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1297; https://doi.org/10.3390/nano10071297
Received: 12 May 2020 / Revised: 25 June 2020 / Accepted: 25 June 2020 / Published: 2 July 2020
(This article belongs to the Special Issue Quantum Dots & Quantum Wells)
Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, via solid state ligand-exchange using 3-mercaptopropionic acid (MPA). The electrical and electro-optical properties of photovoltaic and photoconductor devices were improved after the MPA ligand exchange, mainly because of a mobility increase up to 5 × 10−3 cm 2 / Vs . The same technology was developed to build a tandem photovoltaic device based on a bilayer of PbS quantum dots (QDs) and CsPbBr3 perovskite nanocrystals. Here, the ligand exchange was successfully carried out in a single step after the deposition of these two layers. The photodetector device showed responsivities around 40 and 20 mA/W at visible and near infrared wavelengths, respectively. This strategy can be of interest for future visible-NIR cameras, optical sensors, or receivers in photonic devices for future Internet-of-Things technology. View Full-Text
Keywords: ligand-exchange; 3-mercaptopropionic acid; perovskite nanocrystals; photodetectors ligand-exchange; 3-mercaptopropionic acid; perovskite nanocrystals; photodetectors
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Navarro Arenas, J.; Soosaimanickam, A.; Pashaei Adl, H.; Abargues, R.; P. Boix, P.; Rodríguez-Cantó, P.J.; Martínez-Pastor, J.P. Ligand-Length Modification in CsPbBr3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance. Nanomaterials 2020, 10, 1297.

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