Chloride and Indium-Chloride-Complex Inorganic Ligands for Efficient Stabilization of Nanocrystals in Solution and Doping of Nanocrystal Solids

Vladimir Sayevich^a, Nikolai Gaponik^a, Alexander Eychmüller^a, Chris Guhrenz^a, Maria Sin^b, Eike Brunner^b, Volodymyr Dzhagan^c, Dietrich Zahn^c, Karl Leo^d, Daniel Kasemann^d

^aPhysical Chemistry and Center for Advancing Electronics Dresden (cfAED), TU Dresden, Bergstraße 66b, Dresden, 01069, Germany

^bDepartment of Chemistry and Food Chemistry, Bioanalytical Chemistry, TU Dresden, Bergstraße 66, Dresden, 01069, Germany

^cSemiconductor Physics, TU Chemnitz, Chemnitz, D-09107, Germany

^dInstitut für Angewandte Photophysik, TU Dresden, George-Bähr-Str. 1, Dresden, 1069, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of September Meeting 2016 (NFM16)

Berlin, Germany, 2016 September 5th - 13th

Organizers: Marin Alexe, Enrique Cánovas, Celso de Mello Donega, Ivan Infante, Thomas Kirchartz, Maksym Kovalenko, Federico Rosei, Lukas Schmidt-Mende, Laurens Siebbeles, Peter Strasser, Teodor K Todorov, Roel van de Krol and Ulrike Woggon

Oral, Vladimir Sayevich, presentation 121
Publication date: 14th June 2016

The successful surface functionalization of CdSe and CdSe/CdS core/shell nanocrystals (NCs) with compact chloride and indium-chloride-complex ligands is presented. The chosen inorganic ligands provide not only short interparticle distances, but additionally control the doping and passivation of surface trap states, leading to enhanced electronic coupling in NC-based arrays. The solids based on these NCs show an excellent electronic transport behavior after heat treatment at the relatively low temperature of 190 °C, preserving the typical features of strongly quantum confined building units. Indeed, the indium-chlorido-capped 4.5 nm CdSe NC based thin-film field-effect transistor reach a saturation mobility of µ = 4.1 cm²/(Vâˆ™s) accompanied by a low hysteresis. The capping with chloride and indium-chloride-complex ions allowed the high photoluminescence quantum yield (~ 66 % and ~ 69% in solution, respectively) of CdSe/CdS core/shell NCs to be preserved even when the CdS shell is relatively thin (6 monolayers). The simplicity of the chemical incorporation of chlorine and indium species via solution ligand exchange, the efficient electronic passivation of the NC surface, as well as their high stability as dispersionsmake these materials especially attractive for a large-area solution-processable fabrication of NC based devices.^[1–3]

References

[1] V. Sayevich, N. Gaponik, M. Plötner, M. Kruszynska, T. Gemming, V. M. Dzhagan, S. Akhavan, D. R. T. Zahn, H. V. Demir, A. Eychmüller, Chem. Mater. 2015, 27, 4328.

[2] V. Sayevich, C. Guhrenz, M. Sin, V. M. Dzhagan, A. Weiz, D. Kasemann, E. Brunner, M. Ruck, D. R. T. Zahn, K. Leo, N. Gaponik, A. Eychmüller, Adv. Funct. Mater. 2016, 26, 2163.

[3] V. Sayevich, B. Cai, A. Benad, D. Haubold, L. Sonntag, N. Gaponik, V. Lesnyak, A. Eychmüller, Angew. Chemie Int. Ed. 2016. DOI: 10.1002/anie.201600094

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