Cesium Lead Halide Based Nanocrystals: from Size, Shape and Composition Control to their use in High Voltage CsPbBr3 Nanocrystal Solar Cells.
Liberato Manna a, Francisco Palazon a, Mirko Prato a, Quinten A. Akkerman a, Annamaria Petrozza c, Valerio D’Innocenzo c, Silvia G. Motti c, Marina Gandini c
a Istituto Italiano di Tecnologia, Genova
b Università degli Studi di Genova
c Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia, via Giovanni Pascoli 70/3, 20133, Milan, Italy, Italy
d Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milano, Italy
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Oral, Quinten A. Akkerman, presentation 107
Publication date: 7th November 2016

Lead halide based perovskite semiconductors have recently gained wide interest in solid state photovoltaic devices with impressive power conversion efficiencies (now above 20%).[1] Lead halide based nanocrystals (NCs) currently can be synthesized with a very narrow size distributions and narrow emission linewidths, and extremely high quantum yield up to 90%, making them a very interesting novel material for photovoltaic and optoelectronic.[2] Focusing on CsPbX3 (X = Cl, Br, I) NCs, we demonstrate that, via controlled anion exchange reactions, we can finely tune the chemical composition and optical properties of colloidal CsPbX3 NCs, both in solution and on NC films.[3,4] Size and shape control over CsPbX3 NCs was investigated with the synthesis of highly monodisperse colloidal CsPbBr3 nanoplatelets, exhibiting strong quantum confinement effects, as the PL shifts from 525 nm for bulk to 437 nm.[5]  Although these lead halide based NCs offer superior optical properties, and a plethora of different synthesis methods are available, their synthesis requires using bulky, high-boiling point ligands and solvents. Here, we report a fast, room-temperature synthesis of inks based on CsPbBr3 perovskite nanocrystals using short, low boiling-point ligands and environmentally friendly solvents that are easy to process into high quality thin-films. Requiring no lengthy post-synthesis treatments, the inks are directly used to fabricate thin films of high optoelectronic quality, exhibiting photoluminescence quantum yields higher than 30% and an amplified spontaneous emission threshold as low as 1.5 μJ cm-2. The robustness of such properties is demonstrated by the fabrication of the first perovskite nanocrystal-based solar cells, with density of short circuit current higher than 6 mA cm-2 and open circuit voltages as high as 1.5 V.

References:

[1] Jeon, N. J. et al., Nat Mater (2014), 13, 897-903

[2] Protesescu, L. et al., Nano Letters (2015), 15, 3692-3696,

[3] Q. A. Akkerman, et al., J. Am. Chem. Soc. (2015), 137, 10276-10281

[4] F. Palazon, Q. A. Akkerman, et al., ACS nano (2015), 10, 1224-1230

[5] Q. A. Akkerman, et al., J. Am. Chem. Soc. (2016), 138, 1010–1016

[6] Q. A. Akkerman, et al., submitted 



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