Band Edge Tuning of Two-Dimensional Ruddlesden–Popper Perovskites by A Cation Size Revealed through Nanoplates

Band Edge Tuning of Two-Dimensional Ruddlesden–Popper Perovskites by A Cation Size Revealed through Nanoplates

Current understanding of the effects of various A-site cations on the photophysical properties of halide perovskites (APbI3) 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)...

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Veröffentlicht in:ACS energy letters 2020-05, Vol.5 (5), p.1430-1437
Hauptverfasser: Hautzinger, Matthew P, Pan, Dongxu, Pigg, Alexis K, Fu, Yongping, Morrow, Darien J, Leng, Meiying, Kuo, Ming-Yu, Spitha, Natalia, Kohler, Daniel D, Wright, John C, Jin, Song
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container_issue 5
container_start_page 1430
container_title ACS energy letters
container_volume 5
creator Hautzinger, Matthew P
Pan, Dongxu
Pigg, Alexis K
Fu, Yongping
Morrow, Darien J
Leng, Meiying
Kuo, Ming-Yu
Spitha, Natalia
Kohler, Daniel D
Wright, John C
Jin, Song
description Current understanding of the effects of various A-site cations on the photophysical properties of halide perovskites (APbI3) 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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title Band Edge Tuning of Two-Dimensional Ruddlesden–Popper Perovskites by A Cation Size Revealed through Nanoplates
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