Interface Engineering of Perovskite via Laser Polishing
Mayank Kedia a b, Michael Saliba a b
a Institut für Photovoltaik (ipv), Universität Stuttgart, Pfaffenwaldring 47, D-70569 Stuttgart, Deutschland
b Institut für Energie und Klimaforschung (IEK-5), Forschungszentrum Jülich GmbH, D-52425 Jülich, Deutschland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Mayank Kedia, presentation 143
Publication date: 20th April 2022

Organic-Inorganic Perovskites solar cells (PSCs) have shown power conversion efficiencies (PCE) up to 25.7% in less than a decade. [1] However, the key challenge towards the commercialization is its long-term operational instability, often originating due to mismatched interfaces. Interface engineering has been extensively used to passivate the chemical defects in the perovskite films leading to both, performance and stability enhancement. In this work, we employ the idea of surface polishing to eliminate defects/the presence of amorphous phases on the surface of perovskite film. [2,3] Application of a high-intensity laser pulse partially etches the defective perovskite film and helps in grain growth by recrystallization. [4] 

We use a pulsed UV laser beam on the crystallized perovskite film and optimally tune laser power to polish the surface without compromising the short-circuit current density (Jsc). As an effect of polishing, surface roughness decreases, and photoluminescence increases resulting from the suppression in the non-radiative recombination. The device data also shows significant enhancement in FF by an absolute >4% and Voc increment of >15 meV confirming the reduction in interface losses. As a result, overall PCE increases. The results show a great potential of laser polishing in reliable, well-controllable, and scalable surface treatments in PSCs.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info