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Fused Furan‐Based Organic Small Molecules as Dopant‐Free Hole Transporting Material for Inverted Perovskite Solar Cells
Author(s) -
Li Bingyu,
Li Zhipeng,
Xing Junfei,
Zhu Mingzhe,
Zhou Zhongmin
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000536
Subject(s) - dopant , materials science , perovskite (structure) , energy conversion efficiency , furan , doping , chemical engineering , optoelectronics , organic chemistry , chemistry , engineering
Hole transport material (HTM) is a significant constituent in perovskite solar cells (PSCs). However, HTM generally is not utilized in its pristine form but with dopants (such as lithium salt, tert ‐butyl pyridine, F 4 ‐TCNQ), which accelerates device degradation and leads to poor stability. Therefore, dopant‐free HTM is highly desirable to fabricate stable devices. Herein, a fused furan organic small molecule (C 8 ‐DPNDF) is introduced as a dopant‐free HTM in inverted PSCs. As a potential HTM candidate, C 8 ‐DPNDF shows excellent properties, such as high hole mobility, matched energy level with perovskite, and resistance to perovskite precursor solution. As a result, the device based on C 8 ‐DPNDF as HTM shows a power conversion efficiency (PCE) of 17.5%, compared with 17.1% of the control device based on classic poly(bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine) (PTAA) as the HTM. In addition, the unencapsulated device based on C 8 ‐DPNDF as HTM keeps 92% of its initial PCE after 30 days of storage in ambient air with a relative humidity of ≈40%. This finding is expected to pave the way toward stable and highly efficient inverted PSCs based on dopant‐free HTMs.