Work

Dual-interface modification of perovskite solar cells with lithium acetate and hydroxyl functionalized alkynyl derivative

Year: 2025

Type: article

Abstract: Simultaneous regulation of film morphology and defects at the interface is essential to achieving stable and efficient perovskite solar cells (PSCs). In this study, we synthesized a novel alkynyl passivator DOTB, featured acetylenic π-systems that can engage in π-electron coordination with undercoordinated Pb 2 + and hydroxyl groups that can provide hydrogen bonding with I - anions, thereby modifying perovskite/hole transport layer (HTL) interface. Additionally, we integrated lithium acetate (LiAc) into the electron transport layer (ETL)/perovskite interface. Here LiAc simultaneously functions as a crystallization modulator and defect passivator through Li⁺ diffusion and acetate-mediated interaction. This dual-interface modification strategy accomplishes simultaneous bulk phase passivation and dual interfacial passivation in PSCs. It reduces defect density , enhances crystallization, enhances carrier transport, and reduces non-radiative recombination. As a result, the dual-interface modified PSCs achieve a maximum PCE of 25.48 %. Moreover, the unencapsulated devices demonstrate notably improved stability, preserving above 90 % of their initial performance under ambient air conditions for 1200 hours, and exceeding 80 % following 1000-hours thermal stability assessment conducted at 85 ℃.

Source: Nano Energy

DOI: 10.1016/j.nanoen.2025.111027