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The central role of ligands in electron transfer from perovskite nanocrystals

Published online by Cambridge University Press:  24 April 2017

Alberto Privitera ,
Marcello Righetto ,
Renato Bozio  and
Lorenzo Franco
Alberto Privitera*
Affiliation:
Department of Chemical Science and U.R. INSTM, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
Marcello Righetto
Affiliation:
Department of Chemical Science and U.R. INSTM, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
Renato Bozio
Affiliation:
Department of Chemical Science and U.R. INSTM, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
Lorenzo Franco
Affiliation:
Department of Chemical Science and U.R. INSTM, University of Padova, Via Marzolo 1, I-35131 Padova, Italy
*
*(Email: alberto.privitera@phd.unipd.it)
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Abstract

The nanoscale miniaturization of hybrid organic-inorganic perovskite has given rise to new functionalities, but the full understanding of the multifaceted properties of perovskite nanostructures is still incomplete. Using a combination of optical and magnetic resonance (EPR) spectroscopies, we focused our investigation on the photoinduced electron transfer process taking place in perovskite nanocrystals blended with the fullerene derivative PCBM. In particular we analyzed the different effect of two types of nanocrystal ligands, namely octylamine and oleylamine, on the photoinduced processes. The electron transfer process resulted in efficient fluorescence quenching in a mixed solution and in the formation of charges (PCBM anions) detected by EPR in the blends. Both the optical and EPR techniques revealed a stronger effect when the shorter ligand is present. Finally, pulsed EPR demonstrated the stabilization of the photogenerated charges in proximity of perovskite nanocrystals.

Keywords

photovoltaicelectron spin resonancenanostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 43: Electronic Devices and Materials , 2017 , pp. 2327 - 2335
Copyright
Copyright © Materials Research Society 2017 

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References

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