Effective Ligand Passivation of Cu2O Nanoparticles through Solid-State Treatment with Mercaptopropionic Acid

Azimi SH, Kuhri S, Osvet A, Matt G, Khanzada LS, Lemmer M, Luechinger NA, Larsson MI, Zeira E, Guldi DM, Brabec C (2014)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2014

Journal

Book Volume: 136

Pages Range: 7233--7236

Volume: 136

Issue: 20

Journal Issue: 20

URI: http://pubs.acs.org/doi/abs/10.1021/ja502221r

DOI: 10.1021/ja502221r

Abstract

In colloidal nanoparticle (NPs) devices, trap state densities at their surface exert a profound impact on the rate of charge carrier recombination and, consequently, on the deterioration of the device performance. Here, we report on the successful application of a ligand exchange strategy to effectively passivate the surface of cuprite (Cu2O) NPs. Cu2O NPs were prepared by means of a novel synthetic route based on flame spray pyrolysis. FTIR, XRD, XPS, and HRTEM measurements corroborate the formation of cubic cuprite Cu2O nanocrystals, excluding the possible presence of undesired CuO or Cu phases. Most importantly, steady-state emission and transient absorption assays document that surface passivation results in substantial changes in the intensity of emissive excitonic states-centered at copper and oxygen vacancies-and in the lifetime of excitons near the band edge. To shed light onto ultrafast processes in Cu2O nanocrystals additional pump probe experiments on the femtosecond and nanosecond time scales were carried out. Two discernible species were observed: on one hand, an ultrafast component ( ps) that relates to the excitons; on the other hand, a long-lived component ( μs) that originates from the defects/trap states.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

One Sun, Inc. United States (USA) (US) Nanograde Ltd. Switzerland (CH)

How to cite

APA:

Azimi, S.H., Kuhri, S., Osvet, A., Matt, G., Khanzada, L.S., Lemmer, M.,... Brabec, C. (2014). Effective Ligand Passivation of Cu2O Nanoparticles through Solid-State Treatment with Mercaptopropionic Acid. Journal of the American Chemical Society, 136(20), 7233--7236. https://dx.doi.org/10.1021/ja502221r

MLA:

Azimi, Seyed Hamed, et al. "Effective Ligand Passivation of Cu2O Nanoparticles through Solid-State Treatment with Mercaptopropionic Acid." Journal of the American Chemical Society 136.20 (2014): 7233--7236.

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