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

^aEnvironment and Sustainability Institute, Faculty of Environment, Science and Economy, University of Ex-eter, Penryn Campus, Cornwall, TR10 9FE, U.K

^bFaculty of Environment, Science and Economy, College of Engineering, Mathematics and Physical Science, University of Exeter, Penryn Campus, Cornwall, TR10 9FE, UK.

^cElectrical 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 (CeO_x) 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 CeO_x 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 CeO_xfor the carbon-based PSC. Moreover, the rod-shaped CeO_xdemonstrated 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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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.