Journal
ACS ENERGY LETTERS
Volume 5, Issue 5, Pages 1430-1437Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00450
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-09ER46664]
- NSF CHE REU [1659223]
- PPG Industries Summer Fellowship
- Link Foundation
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Current understanding of the effects of various A-site cations on the photophysical properties of halide perovskites (APbI(3)) is limited by the compositional tunability. Here we report the synthesis and characterization of colloidal nanoplates of a series of 2D Ruddlesden-Popper (RP) perovskites (HA)(2)(A)Pb2I7 (HA = n-hexylammonium) with seven small and large A-site cations to reveal the size effects of such A cations. Absorbance and photoluminescence (PL) measurements show a clear parabolic trend of the optical band gap versus the A cation size, with methylammonium and formamidinium near the bottom. This band gap shifting is attributed to the changing chemical pressure inside the A-site cavity templating the Pb-I framework. PL quantum yield and time-resolved PL measurements show the effect of A cation size on the PL efficiencies and carrier lifetimes. This fundamental investigation can inform the choices of A-site cations that can be incorporated into halide perovskite materials for optoelectronic applications.
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