Boosting efficiency of p-i-n perovskite solar cells via enhanced interfacial dipole strength using Al2O3 nanoparticles

Fei Tang, Nanxi Ma, Feiping Lu, Yong Bai, Ziang Wei, Ziyin Chen, Yongxuan Yang, Zhouniu Chen, Yifei Li, Yisi Tang, Weijun Ling and Xiaobin Liu

Renewable Energy, 2025, vol. 250, issue C

Abstract: Interfacial engineering plays a crucial role in enhancing the performance of perovskite solar cells (PSCs) by optimizing energy alignment and charge transport at the interfaces. While self-assembled monolayers (SAMs) have emerged as effective hole transport layers (HTLs) due to their interfacial dipole effect, the impact of dipole strength optimization on device efficiency remains insufficiently explored. In this study, we present a simple yet effective strategy to enhance interfacial dipole strength in p-i-n PSCs by incorporating aluminum oxide nanoparticles (Al2O3 NPs) as spacers within the Me-4PACz interfacial layer. This approach leads to the formation of a thickened dipole layer, significantly improving energy level alignment and charge extraction. As a result, the power conversion efficiency (PCE) of the PSCs increased from 22.61 % in control devices to 25.59 % in optimized devices. Furthermore, we demonstrate the universality of this strategy by applying it to 2PACz and MeO-2PACz based PSCs, achieving efficiency improvements of 7.2 % and 5.8 %, respectively. This work provides new insights into interfacial dipole engineering, offering a scalable and efficient approach to advancing high-performance PSCs.

Keywords: Perovskite solar cells; Aluminum oxide nanoparticles; Interfacial dipole engineering; Energy level alignment; Charge extraction (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:250:y:2025:i:c:s0960148125010729

DOI: 10.1016/j.renene.2025.123410

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