Influence of lead (II) chloride and/or lead (II) bromide entrance on the efficiency and stability of methyl ammonium lead triiodide perovskite solar cell: Comparative study of the halide composition and substitution percentage

Ebadi, Mehdi; Sefidi, Pariya Yardani; Samadifar, Ahmad; Salari, Dariush; Darbandi, Masih; Hosseini, Mir Ghasem

doi:10.1016/j.optmat.2021.110888

Cited by 4 publications

(1 citation statement)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent studies on 3D HOIP analogues also revolved around alloying halogen anions at the “X” site. As a result, there is a growing body of literature demonstrating anion-tunable properties of MAPbX 3– x X′ x and FAPbX 3– x X′ x (X, X′ = Br – , Cl – , I – ) HOIPs. − For these systems, the mixing-halide approach offer tunability of the optical band gap and emission range, improved PL intensity, enhanced stability, and prolonged charge carriers’ diffusion lengths while maintaining facileness of the synthesis and low fabrication cost. ,− Furthermore, mixed-halide systems can also obviate one of the crucial issues of single-halide MA/FAPbX 3 structures, i.e., their poor stability to adventitious water. For instance, Noh et al reported that a small Br – content in MAPbI 3 thin films results in improved moisture resistance and prolonged decomposition time.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Methylhydrazinium Lead Halide Perovskites: Structural Changes and Effects on Dielectric, Linear, and Nonlinear Optical Properties Entailed by the Halide Tuning

et al. 2022

View full text Add to dashboard Cite

Three-dimensional lead halide perovskites are promising materials for optoelectronic applications. The most famous representative comprise methylammonium (MA + ) and formamidinium (FA + ) cations, but recently, this group was enlarged by methylhydrazinium (MHy + ) analogues that crystallize in polar structures at room-temperature. Properties of threedimensional (3D) perovskites can be tuned by mixing of molecular cations or halide anions. Here, we report synthesis and physicochemical characterization of mixed-halide MHyPbBr x Cl 3−x (x = 0.40, 0.58, 0.85, 1.33, 1.95, 2.25, and 2.55) and MHyPbBr 2.8 I 0.2 perovskites. X-ray diffraction data show that all materials feature a polar monoclinic P2 1 symmetry at room temperature. With the temperature increase, all MHyPbBr x Cl 3−x perovskites undergo a displacive phase transition to another polar orthorhombic Pb2 1 m phase at T 2 ≥ 318 K. The bromine rich crystals (x ≥ 1.33) exhibit an additional order−disorder phase transition to the archetypal cubic Pm3̅ m phase at T 1 ≥ 409 K. In contrast to MHyPbBr x Cl 3−x perovskites, MHyPbBr 2.8 I 0.2 undergoes a direct P2 1 to Pm3̅ m phase transition. The temperature at which the cubic phase is stabilized, stability range of the Pb2 1 m phase, and distortion of the leadhalide octahedra decrease with the increase of Br − content. The structural changes affect dielectric, conductivity, and optical properties. In particular, the Br-rich samples show switchable dielectric behavior near 410−420 K. Furthermore, the activation energy of Cl − ionic conductivity increases with the increase of Br − content in phases Pb2 1 m and P2 1 , whereas in phase Pm3̅ m, the conductivity of Br − ions increases with the increase of Cl − content. The energy band gap narrows and the photoluminescence (PL) bands exhibit red shift when going from Cl to Br and then to I. Interestingly, whereas PL of the Br-rich and Cl-rich samples is dominated by bound exciton and self-trapped exciton bands, respectively, these bands are suppressed for 2.25 ≥ x ≥ 0.85. The PL color is strongly tuned by doping and changes from greenish-blue for the Cl-rich samples to yellowish-green for MHyPbBr 2.8 I 0.2 . SHG studies demonstrate that doping of MHyPbCl 3 with Br − ions reduces the difference between SHG signal intensities of the monoclinic and orthorhombic phases, to the extent that beyond x = 1.95, the SHG response of these phases becomes essentially the same. The relative SHG efficiencies of Br−Cl mixed materials at room temperature increase with the increase in Br content.

show abstract