A phthalocyanine-based polycrystalline interlayer simultaneously realizing charge collection and ion defect passivation for perovskite solar cells

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2024-08, Vol.12 (34), p.2251-22515
• Main Authors: Ohsawa, Tatsuya, Shibayama, Naoyuki, Nakamura, Nobuhiro, Tamura, Shigeto, Hayakawa, Ai, Murayama, Yohei, Makisumi, Kohei, Kitahara, Michitaka, Takayama, Mizuki, Matsui, Takashi, Okuda, Atsushi, Nakamura, Yuiga, Ikegami, Masashi, Miyasaka, Tsutomu
• Format: Article
• Language: English
• Subjects: Cell migration; Charge efficiency; Charge materials; Charge transport; Cost effectiveness; Defects; Energy charge; Gallium; Interlayers; Ion migration; Lewis base; Manufacturing; Manufacturing industry; P-type semiconductors; Passivity; Performance degradation; Perovskites; Photovoltaic cells; Solar cells; Solar energy; Sustainable energy; Thin films
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d4ta02491e

In the quest for sustainable energy solutions, perovskite solar cells have emerged as a promising avenue due to their remarkable efficiency and cost-effectiveness. However, their widespread adoption is hampered by performance degradation issues primarily attributed to ion migration and vacancy formation within halide perovskite films. To mitigate the impact of ion defects, a passivation layer, which typically acts as a barrier for carriers, is employed. Nonetheless, the requirement for extreme thinness to avoid increasing series resistance complicates the manufacturing process. In this study, we introduced gallium phthalocyanine hydroxide (OHGaPc), a p-type organic semiconductor with Lewis base functionality, as a passivation layer to mitigate performance degradation in perovskite solar cells. We demonstrated that this material passivates halide vacancies by being a Lewis base and promotes efficient charge transport as a p-type semiconductor. This dual functionality of OHGaPc not only enhances the stability and performance of perovskite solar cells but also simplifies the manufacturing process by obviating the need for ultra-thin insulating films. Our findings underscore the significance of leveraging the properties of Lewis bases and p-type semiconductors in improving charge extraction and overall cell efficiency, setting a new direction in the development of durable and efficient perovskite solar cells. Perovskite solar cells are efficient and cost-effective but have issues with ion migration from light irradiation. This study uses OHGaPc as a passivation layer to improve light stability and charge transport, increasing efficiency.