Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band Alignment

Zhao

ACS Appl. Energy Mater.

et al. 2021

Low-dimensional halide organic perovskites formed by introducing larger organic amine groups into the perovskite structure provide a unique opportunity to control charge dynamics for various optoelectronic applications via the independent tuning of the energy levels of the perovskite sublattice and the organic spacers. Nevertheless, 1D perovskites suffer from high exciton binding energy, poor charge carrier separation, and transport efficiencies which degrade their optoelectronic performances. To address these issues and to get insight into the essential physical properties of the 1D halide organic perovskites, we have integrated an electronically active organic cation, naphthalene diimide ammonium (NDIA), between the PbX 3 (X = I or Br) chains to form 1D quantum-well perovskite-like crystals (C 23 H 26 N 3 O 4 )Pb(I 1−n Br n ) 3 (0 < n < 1). Type-II band alignment is established between the electron-withdrawing NDIA bilayers and electron-donating inorganic PbX 3 sublattice, allowing efficient charge separation at the interface of the heterojunctions. In addition, the interfacial charge transport is further manipulated by halide engineering, where (C 23 H 26 N 3 O 4 )Pb(I 0.4 Br 0.6 ) 3 exhibits longer-lived charge carriers than that of the neat iodide or bromide counterparts. Combining the single crystal analysis with ultrafast spectral characterization, the prompt charge transfer and long-lived charge-separated state at the interface between the NDIA ligands and the mixed lead halide inorganic sublattices are deliberately elucidated. The presence of Br shortens the distance between the NDIA and halogen atoms to enhance the charge transition, meanwhile serving as an intermediate electronic state to manipulate the charge population to inhibit charge recombination, which greatly facilitates charge transportation. This work provides a prototype to manipulate the alignment of electronic levels between the perovskite sublattice and the organic spacer layer by halogen engineering to achieve desired charge carrier transport for a particular technological interest.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Halogen-Manipulated Interfacial Charge Transport of π-Conjugated Molecule-Lead Halide Hybrids

Zhao

ACS Appl. Energy Mater.

et al. 2021

“…Akin to the lead halide hybrid perovskites, large alkyl cations were then adopted to design bismuth halide perovskite for obtaining better humidity stability. [15][16][17][18] For instance, Nair et al designed and fabricated a (1,3-propanediammonium) 2 Bi 2 I 10 •2H 2 O film, and demonstrated a parallel configured photodetector with a responsivity of 1.14 mA W −1 and repeatable photocurrent in several light on/off cycles. 15 Besides, Zheng et al reported a novel (TMP) 1.5 [Bi 2 I 7 Cl 2 ] perovskite, and achieved obvious photoconductivity and high moisture and light stability.…”

Section: Introductionmentioning

confidence: 99%

Evaporation crystallization of zero-dimensional guanidinium bismuth iodide perovskite single crystal for X-ray detection

Xiao

et al. 2022

Inorg. Chem. Front.

“…A wider choice of organic cations [7], which no longer have to meet strict size requirements [8,9], allows obtaining 2D- [10], 1D- [11,12] or 0D- [13] hybrid perovskites with promising optoelectronic properties. To further improve their performance in solar cells [14], inert organic cations are sometimes replaced [15] by electroactive molecules [16][17][18][19][20], including those encountered in organic charge-transfer complexes [18,[21][22][23][24]. The latter may potentially provide additional functionalities to hybrid perovskites [25], such as (super)conductivity, photoconductivity, ferroelectricity and magnetoresistance [26,27] useful for optoelectronic devices [28].…”

Section: Introductionmentioning

confidence: 99%

New Low-Dimensional Hybrid Perovskitoids Based on Lead Bromide with Organic Cations from Charge-Transfer Complexes

2021

We have obtained a series of low-dimensional hybrid perovskitoids (often referred to as perovskites) based on lead bromide. As organic cations, the derivatives of polyaromatic and conjugated molecules, such as anthracene, pyrene and (E)-stilbene, were chosen to form charge-transfer complexes with various organic acceptors for use as highly tunable components of hybrid perovskite solar cells. X-ray diffraction analysis showed these crystalline materials to be new 1D- and pseudo-layered 0D-perovskitoids with lead bromide octahedra featuring different sharing modes, such as in unusual mini-rods of four face- and edge-shared octahedra. Thanks to the low dimensionality, they can be of use in another type of optoelectronic device, photodetectors.