Cost-effective and solution-processable P-25 TiO₂ nanoparticles as cathode buffer layer for high-efficient and stable organic solar cells

Engineering notes

Engineering notes will be added by the Power for Solar editorial team.

Chinese explanation / 中文解读

中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。

Original abstract

A novel and cost-effective TiO₂ powder (Degussa, P-25) with a uniform size of approximately 25 nm and good solubility in ethanol has been employed as a cathode buffer layer in organic solar cells (OSCs) for the first time. Benefiting from its appropriate work function, the P-25 layer enables superior interfacial contact with both the active layer and the Al cathode. To verify the universality of P-25 in enhancing photovoltaic performance, three types of OSCs based on P3HT:PC₇₁BM, PTB7-Th:PC₇₁BM, and p-DTS(FBTTh₂)₂:PC₇₁BM were fabricated. Compared to devices using a conventional Ca/Al cathode, those incorporating the P-25 cathode exhibit higher power conversion efficiencies (PCEs), primarily attributed to a marked improvement in fill factor (FF). This enhancement is further supported by the finding that the P-25 layer significantly reduces the series resistance (Rₛ) of the devices and increases electron mobility, collectively contributing to the higher FF. Moreover, OSCs with the P-25/Al cathode demonstrate excellent air and thermal stability, retaining over 90% of their initial performance after rigorous testing. P-25 thus emerges as a viable cathode buffer layer material for organic solar cells, according to these results.

Links and sources

Comments