Direct detection of circular polarized light in helical 1D perovskite-based photodiode

Abstract

Detection of circularly polarized light (CPL) has a high potential for development of various optical technologies. Conventional photodetectors require optical polarizers on the device to detect polarized light, and this causes substantial losses of sensitivity and resolution in light detection. Here, we report direct CPL detection by a photodiode using a helical one-dimensional (1D) structure of lead halide perovskites composed of naphthylethylamine-based chiral organic cations. The 1D structure with face-sharing (PbI6)4− octahedral chains whose helicity is largely affected by chiral cations shows intense circular dichroism (CD) signals over 3000 mdeg at 395 nm with the highly anisotropy factor (gCD) of 0.04. This high CD enables photocurrent detection with effective discrimination between left-handed and right-handed CPLs. The CPL detector based on this 1D perovskite achieved the highest polarization discrimination ratio of 25.4, which largely surpasses the direct detecting CPL devices (<4) using chiral plasmonic metamaterials and organic materials.

Giant Optical Activity and Second Harmonic Generation in 2D Hybrid Copper Halides

“…Notably, the anisotropic g‐factor, which is defined as |g CD− − g CD+ |/2, [18] was calculated to be approximately 0.06 at the LMCT band of [CuCl 4 ] 2− (Figure 1 e), which is one order of magnitude larger than that of the chiral (R‐/S‐MBA) 2 PbI 4 hybrid lead halides (ca. 0.006), [7] and is even larger than the record value of 0.04 recently reported for the chiral one‐dimensional (R‐/S‐NEA)PbI 3 [9a] . Additionally, the CD spectra of (R‐/S‐MBA) 2 CuCl 4 did not change significantly after being stored under ambient conditions for one month, demonstrating the excellent long‐term stability of the as‐prepared films (Supporting Information, Figure S2).…”

“…For example, Li and co‐authors developed 2D (R‐/S‐MBA) 2 PbI 4 and investigated their CPL and circularly polarized light detection [8b] . Very recently, using one‐dimensional (R‐/S‐NEA)PbI 3 (NEA=1‐(1‐naphtyl)ethylamine) with a highly anisotropic factor of 0.04, Ishii and Miyasaka fabricated a circularly polarized light detector, which achieved a polarization discrimination ratio as high as approximately 25.4 [9a] . Sargent and co‐workers demonstrated a 3 % spin‐polarized photoluminescence of reduced‐dimensional chiral perovskites even in the absence of an applied external magnetic field [10a] .…”

Giant Optical Activity and Second Harmonic Generation in 2D Hybrid Copper Halides

“…The as‐prepared films exhibit strong mirrored CD signals with a giant anisotropic g‐factor of approximately 0.06, which is even greater than the record value (ca. 0.04) recently reported for chiral (R‐/S‐NEA)PbI 3 [9a] . We discuss the origin of giant optical activity in these samples through theoretical modeling based on density functional theory (DFT).…”

Highly Selective Ultrafast Circularly Polarized Photodiodes Based on π-Conjugated Polymers

“…[19][20][21] More recently, a lowdimensional chiral HOIP has been reported that allows for high CP selectivity in the UV (|gph| = 1.9). [22] Such perovskite devices face challenges relative to competitive technologies however, such as toxicity and instability. While a handful of chiral OPDs have been reported, they demonstrate modest values of |gph| (≤0.1), and other crucial figures of merit (e.g.…”