Effect of tunable morphology in Cerium Oxide as an electron transport layer on the performance of low-temperature processed carbon-based perovskite solar cells.
Sreeram Valsalakumar a, Shubhranshu Bhandari a, Justin Hinshelwood b, Tapas Mallick a, Senthilarasu Sundaram c
a Environment and Sustainability Institute, Faculty of Environment, Science and Economy, University of Ex-eter, Penryn Campus, Cornwall, TR10 9FE, U.K
b Faculty of Environment, Science and Economy, College of Engineering, Mathematics and Physical Science, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, UK.
c Electrical and Electronics Engineering, School of Engineering and the Built Environment, Edinburgh Napier University, Merchiston Campus, Edinburgh EH10 5DT, U.K.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Oral, Sreeram Valsalakumar, presentation 046
DOI: https://doi.org/10.29363/nanoge.iperop.2023.046
Publication date: 21st November 2022

Carbon as a counter electrode for perovskite solar cells (PSC) has shown the potential towards stable and scalable photovoltaic technology. Traditionally these devices have been developed with TiO2-based compact and mesoporous electron transport layers (ETL) for high performance. Deposition of TiO2 layers mainly requires high-temperature Annealing (~450 °C), which can hinder the low-cost manufacturing production or the possibility of PSCs on a flexible substrate. On the other hand, the cerium oxide (CeOx) as the ETL requires only 150 °C processing temperature, which enhances the pathway for the low-temperature-based fabrication of PSCs. Along with processing temperature, the tunable morphology of nanomaterials can produce a significant variation in performance, as seen in different fields of materials science and technology. In this work, we explored the morphology modification aspect of the CeOx and derived a rod and a cubical structure for utilization in a perovskite device. The highest power conversion efficiency (PCE) of 14.3% was recorded for the rod structure CeOx for the carbon-based PSC. Moreover, the rod-shaped CeOx demonstrated higher interaction with the perovskite layer and a lower charge recombination rate when compared with the cube structure, which demonstrated around 12.3% PCE. [SB1] This work shows the potential to analyze morphology-tuned nanomaterials for PSC as an alternative pathway to enhance their performance. The morphology and photovoltaic correlation can change the future of perovskite photovoltaics due to its many component systems.

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