Multilayer Copper-Rich Transparent Electrode as an Alternative Top Anode for High-Performance Semitransparent Perovskite Solar Cells
Giuliana Giuliano a, Sebastiano Cataldo a, Michelangelo Scopelliti a, Tiziana Fiore a, Bruno Pignataro a b
a Dipartimento di Fisica e Chimica (DiFC), Università degli Studi di Palermo, Viale delle Scienze, Ed. 17-18, 90128 Palermo, Italy
b Advanced Technologies Network (ATeN) Center, Università degli Studi di Palermo, Viale delle Scienze, Ed. 18, 90128 Palermo, Italy
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Giuliana Giuliano, 089
Publication date: 11th February 2019

Semitransparent perovskite-based solar cells (ST-PSCs) are highly attractive for applications in the context of Building-Integrated Photovoltaics (BIPVs) as solar windows or in tandem solar cells combined with other low-bandgap solar cells (e.g. silicon or CIGS) to give enhanced light-harvesting [1]. To fabricate high-performance ST-PSCs, one key challenge is that of replacing the conventional opaque metal top electrodes with suitable transparent alternatives. Recently, dielectric/metal/dielectric (DMD) multilayer architectures have been shown to be suitable candidates [2], though generally based on precious metals such as gold or silver, the latter causing also stability issues by reacting with perovskite.

In this work, a novel DMD transparent electrode based on non-precious, less-reactive copper and molybdenum suboxide is manufactured via thermal evaporation and successfully integrated as top anode in semitransparent planar n-i-p perovskite solar cells yielding a maximum efficiency of 12.5%. Uniform and conductive Cu films of about 10 nm are grown onto the oxide surface by means of a pre-deposited ultrathin Au seed layer, which also acts as an effective Cu diffusion barrier. The final MoOx/Au-seed/Cu/MoOx DMD structure shows a very good trade-off between transparency and conductivity as well as a great thermal and mechanical stability. In the perspective of practical BIPV applications, a fine tuning of the perovskite thickness is also carried out to further enhance the device transparency.

Italian MiUR is acknowledged for funding through the programmes PON R&C 2008-2013 and PON R&C 2014-2020. The Advanced Technologies Network (ATeN) Center (Università degli Studi di Palermo) is acknowledged for its infrastructures.

© Fundació Scito
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