Low-Cost Hole-Transporting Materials Based on Carbohelicene for High-Performance Perovskite Solar Cells
Journal
ACS Applied Materials and Interfaces
Journal Volume
13
Journal Issue
17
Pages
20051-20059
Date Issued
2021
Author(s)
Abstract
Two hole-transporting materials (HTMs) based on carbohelicene cores, CH1 and CH2, are developed and used in fabricating efficient and stable perovskite solar cells (PSCs). Owing to the rigid conformation of the helicene core, both compounds possess unique CH-πinteractions in the crystalline packing pattern and good phase stability, which are distinct from the π-πintermolecular interactions of conventional planar and spiro-type molecules. PSCs based on CH1 and CH2 as HTMs deliver excellent device efficiencies of 19.36 and 18.71%, respectively, outperforming the control device fabricated with spiro-OMeTAD (18.45%). Furthermore, both PSCs exhibit better ambient stability, with 90% of initial performance retained after aging with a 50-60% relative humidity at 25 °C for 500 h. Due to the low production cost of both compounds, these newly designed carbohelicene-type HTMs have the potential for the future commercialization of PSCs. ?
Subjects
Costs; Nanocrystalline materials; Perovskite; Ambient stability; Control device; Crystalline packing; Device efficiency; Helicenes; Hole-transporting materials; Low costs; Production cost; Perovskite solar cells
SDGs
Type
journal article