Defects in CsPbX₃ Perovskite: From Understanding to Effective Manipulation for High‐Performance Solar Cells

Abstract

Figure 10. a) Rotational distortion of [BX 6 ] 4− ([PbX 6 ] 4− ) octahedra by introducing smaller B-site cations. Reproduced with permission. [176] Copyright 2018, American Chemical Society. b) Schematic of the formation and stability of α-CsPbI3, γ-CsPbI 3 , and Ca 2+ -doped γ-CsPbI 3 . Reproduced with permission. [144] Copyright 2019, Wiley-VCH. c) The Mn 2+ doping modes by either forming a substitution or an intersitial. Reproduced with permission. [145] Copyright 2018, American Chemical Society. d) Energy band diagram of CsPb 1-x Ge x Br constructed from UV-vis and photoelectron yield spectroscopy measurement. Reproduced with permission. [146] Copyright 2018, Wiley-VCH.

Reversible Light-Induced Enhancement of Photoluminescence Lifetime and Intensity in Perovskite-Phase CsPbI3 Nanocrystals

“…However, the ligands cannot completely passivate all of the dangling bonds presented by atoms at the nanocrystal surface because of the steric hindrance between neighboring alkyl chains . It is known that water can interact with surface defects on the surface of lead halide perovskites and induce halide vacancies. − Liu et al showed that oxygen can passivate halide vacancies in CsPbI 2 Br and speculated that a decrease in exposed halide vacancies limits the adsorption of water. It is possible that both halide vacancies and water adsorption are involved in the formation of slow surface trap states on γ-CsPbI 3 nanocrystals.…”

2D Non‐Layered In2S3 as Multifunctional Additive for Inverted Organic‐Free Perovskite Solar Cells with Enhanced Performance

“…As a result, the inorganic perovskite film always contains a high density of defects, which leads to serious charge recombination and hence reduced steady-state carrier density throughout the film bulk. [14][15][16] To optimize the crystallization of inorganic perovskite as well as efficiently passivate the defects, a variety of organics have been introduced into the perovskite precursor solutions. The resulting organics-doped inorganic perovskites usually exhibited greatly improved photovoltaic performance relative to pristine ones.…”

Defect healingviaa gradient cooling strategy for efficient all-inorganic perovskite solar cells

“…In CsPbX 3 PSCs, the most harmful defects are mainly distributed at the grain boundaries and interfaces. 16 Inspired by the concept of surface passivation in Si technology, various organic/inorganic agents have been employed to heal the perovskite surface. However, the insulating or weakly conductive character of these passivators hinders the charge carrier transport.…”