期刊
CELL REPORTS PHYSICAL SCIENCE
卷 2, 期 12, 页码 -出版社
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100662
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资金
- National Nature Science Foundation of China [21721001, 21771152, 92061122, 92061204, 91961113]
- China Postdoctoral Science Foundation [2020M671940]
A new type of HTM, cor-OMePTPA, has been designed and tested in planar n-i-p PSCs, showing good efficiency and stability compared to traditional HTMs, with better thermal stability.
Core structures with linear, planar, and spiral conformations have been designed as triphenylamine (TPA)-based hole-transporting materials (HTMs), which are the most prevalent small molecular HTMs in perovskite solar cells (PSCs). However, most of the reported TPA-based HTMs cannot achieve sufficient balance between efficiency and stability, which is governed by core structures, Herein, a sym-penta(N,N-bis(4-methoxyphenyl)aniline)corannulene (corOMePTPA) featuring a corannulene core and five TPA peripheral arms is designed as alternative HTM. Planar negative-intrinsic-positive (n-i-p) PSCs with cor-OMePTPA exhibit champion efficiencies of 20% and maintain 86% of their initial performances for more than 1,000 h after thermal annealing at 60 degrees C. Compared with spiro-OMe-TAD, cor-OMePTPA-based PSCs show slightly lower efficiencies but much better thermal stabilities. The main merit of cor-OMePTPA lies in its bimolecular interpenetration capability with noncovalent interactions to modulate the HTM configurations from single-molecular curvature to bimolecular planarity, thereby providing promising opportunities to achieve excellent balance between efficiency and stability.
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