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Demonstration of Photovoltaic Action and Enhanced Stability from a Quasi-Two-Dimensional Hybrid Organic–Inorganic Copper–Halide Material Incorporating Divalent Organic Groups
摘要： Commercialization of solar cells based on photoactive lead–halide perovskites is in-part limited by their toxicity and instability. In this study, new and related copper–halide hybrid organic–inorganic materials containing dicationic 1,6-hexanediammonium (+H3N-C6H12-NH3+) demonstrated superior stability to heat and moisture in comparison to the analogous material containing monocationic 1-propylammonium (C3H7-NH3+) in twice the stoichiometry. Electronic absorption spectra taken of the materials were consistent with an indirect optical bandgap of ~1.8 eV, making them well-suited for application as the photoactive layer in the top cell of a tandem solar cell with silicon. The best-performing single-junction solar cells containing the dicationic material as the photoactive layer exhibited an open-circuit photovoltage in excess of 400 mV and a short-circuit photocurrent density of ~30 μA/cm2. These values are similar to those reported for state-of-the-art copper–halide hybrid organic–inorganic materials containing organic monocations and motivate further research on this class of materials.
关键词： photovoltaic,two-dimensional material,dications,solar cell,copper halide,hybrid material,stability,perovskite
更新于2025-11-19 16:56:42
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π-Dimerization ability of conjugated oligomer dication diradicaloids composed of dithienylpyrrole and benzodithiophene units
摘要： 2+ composed of 2,5- di(2- thienyl)- N- 2+ and 2 Stable conjugated oligomer dications 1 methylpyrrole (DTP) units at the both ends of the π- systems with methoxy substitu- ents at the 3- position of thienyl units and methylthio end- capping group and benzo[2,1- b:3,4- b′]dithiophene (BDT) unit(s) at the central part with sterically de- manding phenyl substituents were synthesized. From DFT calculations and ESR ex- 2+ was reduced periments, it was concluded that the diradical character in 1 in comparison with the radical character of their reference compound 3·+ composed 2+ was considered to have a of one DTP and one BDT units. In addition, the shorter 1 2+. Nevertheless, judging from the re- further lower diradical character than that of 2 2+ showed a comparable π- 2+ and 2 sults of VT- UV- vis- NIR measurements, both 1 dimerization ability at the DTP moiety in dichloromethane solution with 3·+.
关键词： dithienylpyrrole,diradicaloids,conjugated oligomer dications,benzodithiophene,π- Dimerization
更新于2025-09-10 09:29:36