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TMI perovsitepassivation_AFM.pdf (1.94 MB)
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Interface Engineering by Thiazolium Iodide Passivation Towards Reduced Thermal Diffusion and Performance Improvement in Perovskite Solar Cells

preprint
submitted on 07.01.2020 and posted on 09.01.2020 by Manuel Salado, Michael Andresini, Peng Huang, Mohd Taukeer Khan, Fulvio Ciriaco, Samrana Kazim, Shahzada Ahmad

Interface engineering has become one of the facile and effective approach to improve solar cells performance, its long-term stability and retard unwanted side reaction. We have developed three passivating agents which can functionalize the surface and induce hydrophobicity by employing substituted thiazolium iodide (TMI) for perovskite solar cells fabrication. The role of TMI interfacial layers on microstructure and electro-optical properties was assessed for structural as well as transient absorption (TA) measurements. TMI treatment resulted into VOC and FF enhancement by reducing possible recombination paths at perovskite/HTM interface and by reducing the shallow as well as deep traps. These in turn allowed to achieve higher performance as compared to the pristine surface. Additionally, TMI passivated perovskite layer reduces considerably CH3NH3+ thermal diffusion and degradation induced by humidity. The un-encapsulated perovskite solar cells employing TMI exhibited a remarkable stability under moisture levels (~50% RH) retaining ~95% of initial PCE after 800 h of fabrication, paving potential scalable endeavour.

Funding

H2020-European Research Council

History

Email Address of Submitting Author

shahzada.ahmad@bcmaterials.net

Institution

BCMaterials-Basque Center for materials, Applications & Nanostructures

Country

Spain

ORCID For Submitting Author

0000-0002-1218-2556

Declaration of Conflict of Interest

no conflict of interest to declare

Version Notes

pre accepted version

Exports