期刊
CHEMSUSCHEM
卷 14, 期 14, 页码 3001-3009出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100992
关键词
2D perovskites; device stability; Lewis adducts; organic semiconductors; photovoltaic devices
资金
- Swiss National Foundation (SNF) [PZENP2_166871]
- Swiss National Science Foundation (SNF) [PZENP2_166871] Funding Source: Swiss National Science Foundation (SNF)
Incorporating extended pi-conjugated organic cations into layered lead halide perovskites shows promise in improving device performance and stability. Tuning the chemical structure of ligands is crucial, with the resulting Lewis adduct between the BDT cation and surface iodide vacancies enhancing charge transport in the device active layer.
Incorporating extended pi-conjugated organic cations in layered lead halide perovskites is a recent trend promising to merge the fields of organic semiconductors and lead halide perovskites. Herein, we integrate benzodithiophene (BDT) into Ruddlesden-Popper (RP) layered and quasi-layered lead iodide thin films (with methylammonium, MA) of the form (BDT)(2)MA(n-1)Pb(n)I(3n+1). The importance of tuning the ligand chemical structure is shown as an alkyl chain length of at least six carbon atoms is required to form a photoactive RP (n=1) phase. With N=20 or 100, as prepared in the precursor solution following the formula (BDT)(2)MA(N-1)Pb(N)I(3N+1), the performance and stability of devices surpassed those with phenylethylammonium (PEA). For N=100, the BDT cation gave a power conversion efficiency of up to 14.7 % vs. 13.7 % with PEA. Transient photocurrent, UV photoelectron spectroscopy, and Fourier transform infrared spectroscopy point to improved charge transport in the device active layer and additional electronic states close to the valence band, suggesting the formation of a Lewis adduct between the BDT and surface iodide vacancies.
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