講演情報
[17p-K405-7]Passivation of alumina (Al2Ox) carrier selective layer with multifunctional organic molecule for enhanced efficiency and stability in tin-lead (SnPb) perovskite solar cells (PSCs)
〇(PC)Shahrir Razey Sahamir1, Qing Shen1, Hiroshi Segawa2, Shuzi Hayase2 (1.Univ. of Electro-Com, 2.Univ. of Tokyo)
キーワード：
tin-lead SnPb perovskite、stability、oxide carrier selective layer
SnPb based PSCs studies have been increasing as of lately and the performance reaching more than 24% in efficiency has been reported. High efficiency SnPb PSCs typically were developed by either modifying their carrier selective layers or compositional approach whereby the perovskite precursors were formulated with certain A-site substituents and incorporation of additives/dopants. In this presentation, we will demonstrate a simple approach with significant impact on the performance of the investigated SnPb PSCs. Al2Ox has been used widely in perovskite research but quite uncommon in tin based PSCs due to high surface defects formation. We introduced a multifunctional organic molecule to passivate the Al2Ox surface prior the deposition of the SnPb film. The PCEs of the SnPb PSCs were tremendously enhanced from 14.7% to 20.6% when the passivation was applied on the Al2Ox surface. We will demonstrate from fundamental point of view based on FESEM and elemental XPS characterisations on the defects passivation and PCE enhancement. Impedance spectroscopy study was also conducted to demonstrate how the passivation affects the recombination resistance which is parallel to the surface defects formation. The stability will also be discussed to elucidate the passivation effect.