In Situ Thermal Cross-Linking of 9,9-Spirobifluorene-Based Hole-Transporting Layer for Perovskite Solar Cells
ACS APPLIED MATERIALS & INTERFACES(2023)
摘要
A novel 9,9 '-spirobifluorene derivative bearing thermally cross-linkable vinyl groups (V1382) was developed as a hole-transporting material for perovskite solar cells (PSCs). After thermal cross-linking, a smooth and solvent-resistant three-dimensional (3D) polymeric network is formed such that orthogonal solvents are no longer needed to process subsequent layers. Copolymerizing V1382 with 4,4 '-thiobisbenzenethiol (dithiol) lowers the cross-linking temperature to 103 degrees C via the facile thiol-ene "click" reaction. The effectiveness of the cross-linked V1382/dithiol was demonstrated both as a hole-transporting material in p-i-n and as an interlayer between the perovskite and the hole-transporting layer in n-i-p PSC devices. Both devices exhibit better power conversion efficiencies and operational stability than devices using conventional PTAA or Spiro-OMeTAD hole-transporting materials.
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关键词
cross-linking,temperature,hole-transportinglayer,perovskite solar cell,spirobifluorene
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