Abstract
Methylammonium lead iodide perovskite (MAPbI3) is renowned for an impressive power conversion efficiency rise and cost-effective fabrication for photovoltaics. In this work, we demonstrate that polycrystalline MAPbI3s undergo drastic changes in optical properties at moderate field strengths with an ultrafast response time, via transient Wannier Stark localization. The distinct band structure of this material - the large lattice periodicity, the narrow electronic energy bandwidths, and the coincidence of these two along the same high-symmetry direction – enables relatively weak fields to bring this material into the Wannier Stark regime. Its polycrystalline nature is not detrimental to the optical switching performance of the material, since the least dispersive direction of the band structure dominates the contribution to the optical response, which favors low-cost fabrication. Together with the outstanding photophysical properties of MAPbI3, this finding highlights the great potential of this material in ultrafast light modulation and novel photonic applications.
Highlights
Methylammonium lead iodide perovskite (MAPbI3) is renowned for an impressive power conversion efficiency rise and cost-effective fabrication for photovoltaics
Methylammonium lead iodide perovskite (MAPbI3) has become a remarkable material for photovoltaic applications due to the dramatic increase of the power conversion efficiency[1] and the cost-effective fabrication processes[2]. The success of this material is due to its large absorption cross-section[3] and the exceptional transport properties such as long carrier diffusion lengths[4,5], high carrier mobilities[6], and defect tolerance[7]. Besides their use in solar cells and light-emitting diodes, in this work, we demonstrate that MAPbI3 has outstanding properties as a promising optical modulator
We demonstrate that 38% modulation depth and
Summary
Methylammonium lead iodide perovskite (MAPbI3) is renowned for an impressive power conversion efficiency rise and cost-effective fabrication for photovoltaics. Lattice periods results in an energy shift of neED with respect to the central spatially direct (n = 0) transition, this Wannier–Stark localization leads to strong spectral modulation of the interband absorption continuum below and above the optical bandgap.
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