Accelerating hole extraction by inserting 2D Ti₃C₂-MXene interlayer to all inorganic perovskite solar cells with long-term stability

Abstract

MXenes have been demonstrated as a potential candidate in the field of photovoltaics and energy storage owing to their high transmittance, metallic conductivity and tunable work function.

Low-Temperature Aging Provides 22% Efficient Bromine-Free and Passivation Layer-Free Planar Perovskite Solar Cells

“…Upon increasing the bias voltage in region 2, the trap-filled limit voltage ( V TFL ) was reached when all of the traps were filled, and the defect density ( N t ) could be calculated from Eq. 1 [ 58 ]: where ε r is the relative permittivity of perovskite material ( ε r = 32) [ 9 , 59 ], ε 0 is the vacuum permittivity ( ε 0 = 8.85 × 10 −12 F m −1 ), e is the electron charge, and L is the thickness of perovskite film ( L = 800 nm) in the devices [ 60 ]. The value of V TFL decreased from 0.73 to 0.60 V after performing the aging treatment; the estimated defect density of 4.97 × 10 15 cm −3 for the LTAG-based device was lower than that for the control reference (6.05 × 10 15 cm −3 ).…”

Interfacial Strain Release from the WS2/CsPbBr3 van der Waals Heterostructure for 1.7 V Voltage All‐Inorganic Perovskite Solar Cells

“…Alternatively, all-inorganic CsPbX 3 (X = I À , Br À , or Cl À ) perovskites [6][7][8] especially tri-brominated CsPbBr 3 display a superior environmental tolerance against heat, moisture, oxygen, and/ or UV light, demonstrating a great potential use in tandem and semitransparent solar cells owing to their large band gaps. [9] Although many strategies have been developed to maximize the power generation, [10][11][12][13][14] the highest PCE of the state-of-the-art CsPbBr 3 PSCs is still far from its theoretical limit efficiency owing to the substantial charge recombination and sluggish charge extraction efficiency. It is still a great challenge to better understand the mechanism behind the sluggish efficiency and to provide an effective path to enhance the photovoltaic performances of all-inorganic CsPbBr 3 solar cells.…”

Metal Halide Perovskite/2D Material Heterostructures: Syntheses and Applications

“…introduced Ti 3 C 2 ‐MXene nanosheets as the HTL in all inorganic CsPbBr 3 PSCs with an architecture of FTO/TiO 2 /CsPbBr 3 /Ti 3 C 2 ‐MXene/carbon. [ 143 ] The surface functional groups such as = O of Ti 3 C 2 ‐MXene nanosheets can strongly interact with unbonded Pb atoms, thus effectively passivate the deep defects in the CsPbBr 3 films. The n‐i‐p planer device with Ti 3 C 2 ‐MXene as the HTL exhibits a moderate PCE of 9.01%.…”