Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
DOI: https://doi.org/10.29363/nanoge.abxpvperopto.2018.050
Publication date: 11th December 2017
In recent years, there has been an increasing interest in the field of perovskite solar cells (PSCs) that led to an unprecedented power conversion efficiency (PCE) of >22 % on the lab-scale devices. State-of-the-art PSCs utilize high temperature (> 450 °C) processed TiO2 as their electron transport layer. However, this high temperature processing remains a key challenge to upscaling techniques such as roll-to-roll processing on flexible substrates or inkjet printing on large area devices. In this work, we tackle this challenge using TiO2 nanoparticles (TiO2-np) instead. The synthesis process allows precise control over several variables such as particle size, doping and dispersing capability in different solvents. Here, we show high performance solar cells achieved using not only with spin-coated CH3NH3PbI3 (initial: >19 %, stabilized: 18.2 %) but also with other perovskites absorber layers that includes co-evaporated CH3NH3PbI3 (initial: >17 %) and triple cation perovskite, Cs0.1(MA0.17FA0.83)0.9Pb(I0.83Br0.17)3 (initial: >19 %). Moreover, we show that these TiO2-np can be used to achieve efficient PSCs both in thin (30 nm) and thick (75 nm) layer configurations. In addition, the doping of the TiO2-np with niobium (Nb) results in a significant improvement for the thicker layers. Furthermore, when dispersed in appropriate solvents, we demonstrate both inkjet printing and slot die coating processes for the TiO2-np. PSCs fabricated with such processes show high initial PCE of >17%, paving the way for high throughput and digitally printed PSCs.
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