Organic Salt-Doped Polymer Alloy: A New Prototype Hole Transporter for High-Photovoltaic-Performance Perovskite Solar Cells

作者：Bingchen Zhang, Shang-Wen Lan, Chia-Ha Tsai, Chien-Hung Chiang, Chun‐Guey Wu · 发表于：ACS Applied Materials & Interfaces · 年份：2025 · DOI：10.1021/acsami.4c19907 · 被引用次数：5 · 研究领域：Perovskite Materials and Applications、Conducting polymers and applications、Organic Electronics and Photovoltaics

High Resolution Image Download MS PowerPoint Slide Hole-transporting layer (HTL) is one of the key components in a regular perovskite solar cell (r-PSC), which has the function of extracting the photon-excited holes from the absorber and then transporting them to the electrode. The most commonly used HTL in r-PSC is LiTFSI and tBP-doped spiro-OMeTAD. The inevitable instability induced by a deliquescent inorganic salt (LiTFSI), the migration of small lithium ions, and the necessary oxidation process in air hinder the commercialization of this technology. In this paper, a new undoped D–A copolymer (P15) is used as a hole-transporting material (HTM) for r-PSC but with moderate photovoltaic performance. Therefore, an organic salt, DPI-TPFB, having a big organic cation and a hydrophobic anion, was used as a dopant to increase the conductivity/hole mobility of P15 while avoiding the instability caused by lithium salt and moisture. Furthermore, an amphiphilic polymer, PDTON (with hole- transporting and perovskite-passivation ability), was added to P15 to form a polymer alloy, ( P15 + PDTON), to further enhance the crystallinity and, therefore, the conductivity/hole mobility of P15 via space-confined interaction. As a result, r-PSCs based on DPI-TPFB-doped ( P15 + PDTON) HTLs exhibit the highest power conversion efficiency (PCE) of 18.8%, which is higher than those of the cells based on DPI-TPFB-doped P15 (15.08%), DPI-TPFB-doped PDTON (7.37%), and undoped ( P15 + PDTON) (15.66%) HTL...