Abstract
AbstractA key challenge for the commercialization of perovskite photovoltaics is the transfer of high‐quality spin coated perovskite thin‐films toward applying industry‐scale thin‐film deposition techniques, such as slot‐die coating, spray coating, screen printing, or inkjet printing. Due to the complexity of the formation of polycrystalline perovskite thin‐films from the precursor solution, efficient strategies for process transfer require advancing the understanding of the involved dynamic processes. This work investigates the fundamental interrelation between the drying dynamics of the precursor solution thin‐film and the quality of the blade coated polycrystalline perovskite thin‐films. Precisely defined drying conditions are established using a temperature‐stabilized drying channel purged with a laminar flow of dry air. The dedicated channel is equipped with laser reflectometry at multiple probing positions, allowing for in situ monitoring of the perovskite solution thin‐film thickness during the drying process. Based on the drying dynamics as measured at varying drying parameters, namely at varying temperature and laminar air flow velocity, a quantitative model on the drying of perovskite thin‐films is derived. This model enables process transfer to industry‐scale deposition systems beyond brute force optimization. Via this approach, homogeneous and pinhole‐free blade coated perovskite thin‐films are fabricated, demonstrating high power conversion efficiencies of up to 19.5% (17.3% stabilized) in perovskite solar cells.
Highlights
In the last decade, hybrid metal–halide perovskites emerged as a new class of solution-processable semiconductors with excellent optoelectronic properties.[1,2,3] While the initial advancement in this field was mostly driven by the material methylammonium lead iodide (MAPbI3) perovskite, mixedcation perovskites so-called double, triple, or quadruple-cation perovskites[4,5,6,7,8] have come into focus in recent years
We introduce a combined method of process transfer: controlling the drying process of the precursor solution thinfilm with precisely defined environmental parameters and, at the same time, monitoring of the drying dynamics during the process of perovskite formation
We find that the layer morphology and the solar cell power conversion efficiencies (PCE) strongly depend on the applied control parameters, the air flows and temperatures
Summary
Hybrid metal–halide perovskites emerged as a new class of solution-processable semiconductors with excellent optoelectronic properties.[1,2,3] While the initial advancement in this field was mostly driven by the material methylammonium lead iodide (MAPbI3) perovskite, mixedcation perovskites so-called double-, triple-, or quadruple-cation perovskites[4,5,6,7,8] have come into focus in recent years. The material exhibits a broad optical absorption with a bandgap of ≈1.55 eV as well as long excited charge carrier life times and diffusion lengths due to its high defect tolerance.[9,10,11,12] The discovery of the beneficial optoelectronic properties of hybrid perovskites has tremendous impact on a large range of optoelectronic technologies,[13,14,15,16,17] among which perovskite thin-film photovoltaics (PV) are very prominent.[3,18]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
