Advanced energy materials: high electron affinity for fast hole extraction and preparation of high efficiency flexible perovskite solar cells

the Halley yuan team of School of materials science engineering Shanghai Jiaotong University / State Key Laboratory of metal matrix composites studied the effect of electron affinity on the properties of hole transport materials. In particular 36-difluoro-25 - 7 - 7 - 8 - 8-hexacyanoquinoline dimethyl (f2hcnq) molecule was first used to improve the performance of the hole transport layer. The conductivity of the hole transport layer was increased by 10 times the energy gap between Fermi level valence b was reduced from 0.60 ev to 0.24 ev Therefore the hole extraction ability is increased about 5 times. This makes the small area trans perovskite solar cells based on rigid flexible substrates achieve the highest photoelectric conversion efficiency of 22.13% 20.01% respectively the photoelectric conversion efficiency of large area flexible module (36.1cm2) reaches 12.4%. It provides a low-cost high-performance strategy for the future.
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