Modification of NiO-based transporting materials for featuring highly efficient photovoltaic

Siow, Hwa Teo and Shuzi Hayase and Tingli Ma (2024) Modification of NiO-based transporting materials for featuring highly efficient photovoltaic.

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Abstract

The performance of high-efficiency inverted perovskite solar cells (PSCs) heavily depends on the quality of the hole transporting layer (HTL) and its interfaces. This study explores how incorporating lanthanum (La) into the NiOx matrix affects defect passivation, ultimately enhancing charge extraction capabilities and stability without sacrificing power conversion efficiency. The introduction of La results in a noticeable improvement in the quality of the La–NiOx layer, eliminating the formation of pinholes. Furthermore, La incorporation modifies the energy band alignment, which enhances hole transport and increases the open-circuit voltage (Voc) beyond 1 V compared to pure NiOx. The advantageous impact of La is further confirmed through photoluminescence measurements, demonstrating effective passivation of trap states. Significantly, PSCs utilizing La–NiOx as the HTL exhibit a 21% increase in efficiency and superior stability compared to those with pristine NiOx. Remarkably, solar cells doped with 3 moles% La maintained 95% of their efficiency after 50 days of storage in a moisture-free desiccator, and 98% efficiency retention was observed for cells stored in a glovebox, substantially outperforming pristine counterparts. The positive effects of La incorporation also extend to the conductivity of the solar cells, evidenced by a reduction in charge transfer resistance (Rct) from 3100 Ω in pristine cells to 1200 Ω. Additionally, the presence of La shortens the carrier lifetime, indicating reduced recombination processes and more efficient charge carrier transfer from the perovskite layer. Overall, while there is still room for enhancing the power conversion efficiency of La–NiOx PSCs through further modifications, the addition of La has demonstrably improved their stability, paving the way for future commercialization opportunities.

Item Type:	Proceedings
Keyword:	Inverted solar cell, Lanthanum, Hole transporting layer, Power conversion efficiency, Stability
Subjects:	Q Science > QD Chemistry > QD1-999 Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-9971 Electrical engineering. Electronics. Nuclear engineering
Department:	FACULTY > Faculty of Science and Natural Resources
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	20 Mar 2025 10:07
Last Modified:	20 Mar 2025 10:07
URI:	https://eprints.ums.edu.my/id/eprint/43267

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