講演情報
[22p-C601-21]Defect Passivation of Perovskite Solar Cells using Alkylamine-functionalized Reduced Graphene Oxide-based Additive
〇(D)James Caseria Solano1, Itaru Raifuku1,2, Hidenori Kawanishi1, Yukiharu Uraoka1 (1.NAIST, 2.Aoyama Gakuin Univ.)
キーワード：
Perovskite Solar Cells、Passivation
Perovskite Solar Cells (PSC) still suffer from issues that involve intrinsic defects and degradation as grain boundaries and surfaces can be sites for charge-carrier recombination and susceptible entry point for humidity-induced degradation. These promote lowered photovoltaic performance and physical degradation of the devices over time. In this work, tetraethylpentamine (TEPA)-functionalized reduced graphene oxide (rGO) was used as a passivation material by spin-coating to perovskite layer. TEPA-rGO-passivated devices showed improved overall photovoltaic performance mainly due to increase in open-circuit voltage and fill factor, and slight increase in short-circuit current density. Time-resolved photoluminescence spectroscopy revealed suppression of charge-carrier recombination through effective passivation of TEPA-rGO as evident from the increase in average carrier lifetime by around 0.3 µs. Finally, better stability was observed for TEPA-rGO-passivated devices maintaining more than 90% PCE relative to initial value compared to less than 60% for control devices, in a span of ~325 hours.