Homogeneously Miscible Fullerene inducing Vertical Gradient in Perovskite Thin-Film toward Highly Efficient Solar Cells

Kyusun Kim, Ziang Wu, Jiye Han, Yue Ma, Sangsu Lee, Sung Kwang Jung, Jin Wook Lee, Han Young Woo, Il Jeon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Fullerene-based n-type charge-collecting materials have emerged as a solution for high-performance perovskite solar cells. However, their application to perovskite solar cells is limited in the device architecture and only a small amount of fullerene additives have been introduced to the device system, because of the immiscibility of the fullerene species with polar solvents. To overcome this, triethylene glycol monomethyl ether chain-attached fullerene derivatives are synthesized and applied to normal-type perovskite solar cells. The newly synthesized fullerenes exhibit excellent solubility in polar solvents. A novel approach to introducing miscible fullerenes into perovskite devices and inducing a favorable vertical gradient is proposed. Forming an overcoat on an electron-transporting layer and waiting for a few minutes, the fullerene derivatives progressively permeate into the fullerene-doped perovskite active film. By fabricating perovskite solar cells combining direct mixing, overcoating, and waiting techniques, a remarkably high device efficiency of 23.34% is achieved. The high performance is attributed to the fullerene additives with a vertical gradient passivating the perovskite defect sites effectively and the overcoat enhancing the charge transfer. The device performance is certified by a national laboratory, which is the highest efficiency among the fullerene additives-used perovskite solar cells.

Original languageEnglish
Article number2200877
JournalAdvanced Energy Materials
Volume12
Issue number20
DOIs
Publication statusPublished - 2022 May 26

Keywords

  • fullerene doping
  • fullerene passivation
  • layered materials
  • perovskite solar cells
  • soluble fullerene

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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