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Fabrication of lead halide perovskite films via aerosol deposition method for optoelectronic applications

Title data

Leupold, Nico ; Lukas, Daniel ; Herrmannsdörfer, Tim ; Panzer, Fabian ; Moos, Ralf:
Fabrication of lead halide perovskite films via aerosol deposition method for optoelectronic applications.
2019
Event: PACRIM 13, The 13th Pacific Rim Conference of Ceramic Societies , 27.10.-1.11.2019 , Okinawa, Japan.
(Conference item: Conference , Speech )

Abstract in another language

Lead halide perovskites have gained much attention in recent years for their remarkable optoelectronic properties. They can be applied in various devices as highly efficient active semiconductor materials e.g. in x-ray detectors or LEDs. When lead halide perovskites are used in solar cells, their efficiency has been increased to currently 24.2 %within a few years. Typically, perovskite processing is solution-based, e.g. via spin coating or slot die coating. Hereby, the educt salts are dissolved in mostly toxic solvents. Upon drying the perovskite forms and simultaneously the corresponding film grows. This inevitably couples material synthesis and film formation. Therefore, we pursue the approach of synthesizing a perovskite powder in a first step, which in the second step is used for film formation by the aerosol deposition (AD) method. With this approach, each processing step can be optimized independently. In a proof of concept work, we already could demonstrate the successful deposition of methylammonium lead (II) iodide (MAPbI3), the most investigated hybrid perovskite until today, via the AD method. In the work presented here, we synthesize the perovskite powders directly from the educt salts using a mechanochemical approach by means of a planetary ball mill. This leads to highly stable perovskite powders with optoelectronic properties comparable to solution-processed films. The highly agglomerated and soft powder easily forms thick (> 100 μm), yet porous films making the deposition of thin (< 1 μm) and compact layers, as they are required for solar cells, challenging. To overcome these issues, we modified the AD apparatus for the deposition of thin compact films with an area of 1 cm². Fig. 1a shows an SEM image of the surface of a highly compact thin film and Fig. 1b shows the corresponding cross section demonstrating the typical good adhesion to the glass substrate. The results are accompanied by measurements of electrical properties and photoluminescence to further characterize the films and evaluate the effect of temperature treatment on the AD lead halide films. This work demonstrates the successful processing of the powder into dense layers with low surface roughness, which is a substantial step for the completely dry fabrication of solar cells.

Further data

Item Type: Conference item (Speech)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 11 Nov 2019 13:17
Last Modified: 11 Nov 2019 13:17
URI: https://eref.uni-bayreuth.de/id/eprint/53148