Rotatable Skeleton for the Alleviation of Thermally Accumulated Defects in Inorganic Perovskite Solar Cells

Abstract

The stability of perovskite solar cells has been identified as the bottleneck for their industrialization. With an aim at tackling this challenge, we self-synthesize a thus-far unreported linearly rotatable structure perovskite, i.e., TrMAPbX 3 (X = Br, I). The as-prepared hybrid perovskite is observed to demonstrate extremely high stability during device operation with high electric field strength and high temperature, which is associated with the good lattice-matching heterojunction structure between the linearly rotatable TrMAPbX 3 structure and 3D inorganic perovskite domain within a wide temperature range. The tight-fitting interface structure is devoted to inhibiting the accumulation of vacancy defects during device operation, which further avoids the δ-phase transition and charge transport resistance. Accordingly, we realize a CsPbI 3−x Br x inorganic perovskite-based solar cell with power conversion efficiency (PCE) of 20.59%, extending the remarkably high thermal stability to 192 h (85 °C and relative humidity of 25%) and 3055 h (25 °C and relative humidity of 25%).

An Emerging Stannous Fluoride Complex‐Enabled Highly Efficient Electron Collection and High Stability of Tin‐Based Perovskite Solar Cells

“…The smooth potential distribution also indicates the less trap states and enhanced charge transport properties. [ 31 ]…”

“…The smooth potential distribution also indicates the less trap states and enhanced charge transport properties. [31] We demonstrate XPS to investigate the inhibitory effect of TPY on the formation of trap states. Figure 4a,b shows the fit XPS spectra of Sn 3d.…”

Annual research review of perovskite solar cells in 2023

“…Performance degradation of PSCs is usually caused by ion migration (metal and halide ions), carrier-driven phase segregation [301], and defect aggregation [302] under solar irradiation due to the photochemical activities of iodine-defects activated by their deep VB [261,265]. In particularly, the iodine transport pathways from the PVK to the HTL layer can strongly influence lightinduced halide segregation, ultimately determined by the HTL HOMO energy and halogen redox potentials [303] (figures 22(a) and (b)).…”

Notable Performance Enhancement of CsPbI2Br Solar Cells by a Dual-Function Strategy with CsPbBr3 Nanocrystals

“…Due to the long carrier lifetime, high absorption coefficient and tunable bandgap, − organic–inorganic hybrid perovskite solar cells (PSCs) have shown rapid development in the past decade, with the power conversion efficiency (PCE) comparable to that of crystalline silicon solar cells . However, because of the decomposition of the fragile cations (CH 3 NH 3 + or NHCHNH 3 + ) under thermal, light, and moisture attack, the performance of hybrid PSCs is unstable, which is the main barrier to the commercialization of the related solar cells. , As a unique alternative, all-inorganic perovskites (CsPbX 3 , X = I, Br), replacing the organic cations with Cs + , exhibit better light and thermal stability. , Among them, CsPbI 2 Br with a rational bandgap of 1.91 eV exhibits great potential for photovoltaic (PV) application, especially in semitransparent and tandem PV devices. , …”