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Transporting holes stably under iodide invasion in efficient perovskite solar cells.

Tao WangYao ZhangWeiyu KongLiang QiaoBingguo PengZhichao ShenQifeng HanHan ChenZhiliang YuanRongkun ZhengXudong Yang
Published in: Science (New York, N.Y.) (2022)
Highly efficient halide perovskite solar cells generally rely on lithium-doped organic hole transporting layers that are thermally and chemically unstable, in part because of migration of iodide anions from the perovskite layer. We report a solution strategy to stabilize the hole transport in organic layers by ionic coupling positive polymer radicals and molecular anions through an ion-exchange process. The target layer exhibited a hole conductivity that was 80 times higher than that of the conventional lithium-doped layer. Moreover, after extreme iodide invasion caused by light-soaking at 85°C for 200 hours, the target layer maintained high hole conductivity and well-matched band alignment. This ion-exchange strategy enabled fabrication of perovskite solar cells with a certified power conversion efficiency of 23.9% that maintained 92% under standard illumination at 85°C after 1000 hours.
Keyphrases
  • perovskite solar cells
  • highly efficient
  • ionic liquid
  • solid state
  • quantum dots
  • cell migration
  • room temperature
  • solar cells
  • water soluble