Stability of the CsPbI₃perovskite: from fundamentals to improvements

Abstract

Over the past few years, we have witnessed the occurrence and progress of CsPbI3 semiconductor material as a superstar in the photovoltaic fields. By virtue of its excellent photoelectric properties,...

Highly Efficient and Stable CsPbTh3 (Th = I, Br, Cl) Perovskite Solar Cells by Combinational Passivation Strategy

“…Knowing that vacancy‐mediated diffusion of the iodide ions is the most common process within CsPbI 3 framework. [ 4 ] In addition, we examined the iodine ion migration within the CsGA 0.04 PbI 3 Ac 0.02 framework by DFT calculation, as shown in Figure S2 (Supporting Information), both path‐1 and path‐2 exhibit higher relative energy than the pristine CsPbI 3 , suggesting that the iodine ion migration was effectively suppressed. Except for the crystallographic defects, the passivation of the surface and grain defects is also essential for improving the performance of PSCs.…”

“…The black phases of CsPbI 3 have aroused widespread attention in the photovoltaics community due to its exceptional photovoltaic properties such as higher efficiency, excellent chemical and thermal stability, which act as a potential candidate for solar cells. [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] In recent years, the power conversion efficiency (PCE) of CsPbI 3 perovskite solar cells (PSCs) climbed rapidly from 2.9% first reported by Snaith and co‐workers to 20.8% by Liu and co‐workers, and the efficiency gap between the CsPbI 3 and organic–inorganic hybrid PSCs is further reduced. [ 8 , 9 , 10 , 11 , 12 ] Furthermore, CsPbI 3 has a suitable bandgap (≈1.70 eV) and can be used as the top cell of tandem photovoltaic cells.…”

“…[ 15 , 16 , 17 ] The mechanism was the lattice distortion of β ‐phase and γ ‐phase CsPbI 3 by the decreased bond angle of Pb—I—Pb and increased bond length of Pb—I, resulting in a lower formation temperature of CsPbI 3 perovskite film. [ 4 , 18 ] Several studies have confirmed that DMA cations as the A site additive can induce the formation of intermediate phase during annealing, but they will disappear in the final CsPbI 3 films due to high temperature and volatility. [ 19 , 20 , 21 ] In other words, it is not the enhancement of tolerance factor that changes the stability of the black phase, but the microstrain that arises from the distortion of corner‐connected [PbI 6/2 ] − octahedra in the CsPbI 3 framework.…”

Black‐Yellow Bandgap Trade‐Off During Thermal Stability Tests in Low‐Temperature Eu‐Doped CsPbI3

“…Among all the existing CPs, the most informative are those at the energy bandgap [ 58 ] of black γ‐phase and yellow δ‐phase (Eg black = 1.78 eV and Eg yellow = 2.92 eV at RT [ 60 ] ). In particular, we have monitored the Eg black over the annealing time at a fixed temperature to have a preliminary and qualitative estimate of the phase transformation time scale.…”

Regulating the phase stability and bandgap of quasi-2D Dion–Jacobson CsSnI3 perovskite via intercalating organic cations

“…All-inorganic lead halide perovskites (CsPbI 3 ) with great potential as next-generation solar energy absorbers have achieved their champion photovoltaic conversion efficiency (PCE) exceeding 17% 1,2 owing to their superior chemical stability, and outstanding electronic and photoelectric properties. 3–5 However, the commercial application of CsPbI 3 -based devices is severely impeded by the toxicity of the Pb element. 6 Thus, research into Pb-free and environmental friendly perovskites alternatives has emerged.…”