• 文献标题:   Suppression of Sn2+/Sn4+ oxidation in tin-based perovskite solar cells with graphene-tin quantum dots composites in active layer
  • 文献类型:   Article
  • 作  者:   MAHMOUDI T, RHO WY, KOHAN M, IM YH, MATHUR S, HAHN YB
  • 作者关键词:   tinbased perovskite solar cell, suppression of sn2+, sn4+ oxidation, graphenetin quantum dots composite, efficiency stability
  • 出版物名称:   NANO ENERGY
  • ISSN:   2211-2855 EI 2211-3282
  • 通讯作者地址:  
  • 被引频次:   23
  • DOI:   10.1016/j.nanoen.2021.106495 EA SEP 2021
  • 出版年:   2021

▎ 摘  要

Tin (Sn) halide perovskite has been a promising candidate in lead-free perovskite solar cells (PSCs), but its chemical instability attributed to Sn2+/Sn4+ oxidation reduces device performance and stability. To address this problem, we propose a new approach, i.e. fabrication of mesoporous n-i-p Sn-based PSCs with the photoactive composite made of mixed-organic-cation Sn halide perovskite and reduced graphene oxide (rGO) sheets anchored with Sn quantum dots (i.e., FA0.8MA0.2SnI3/rGO-Sn QDs). The rGO-Sn QDs in active layer not only suppress the destructive Sn2+/Sn4+oxidation and recombination but also accelerate charge transport, improve charge-carrier lifetime and reduce trap state density. Compared to the power conversion efficiency (PCE) of SnPSC without Sn QDs, the composite-basted champion device showed 55% increase in efficiency, attributed to strong suppression of Sn2+/Sn4+oxidation and recombination. Furthermore, the champion device showed remarkable reproducibility and stability improvement, representing an essential step for the practical use of lowcost and lead-free PSCs.