A residual strain regulation strategy based on quantum dots for efficient perovskite solar cells

Abstract

Lead halide perovskite film exhibits excellent optoelectronic properties, while the currently most common preparing method usually needs a conductive-annealing process, which inevitably leads to residual strain and defect, hindering the...

A stress relaxation strategy for preparing high-quality organic–inorganic perovskite thin films via a vapor–solid reaction

“…This method involves introducing cations with larger radii into the perovskite lattice, which effectively supports the perovskite lattices and helps alleviate the tensile stress present in the lms. 6,11,13 Building upon this concept, we employed vapor annealing using organic ammonium salts in our study. Specifically, we utilized a range of organic ammonium salts with varying molecular sizes for vapor annealing at 170 °C in a specially designed chamber operating at atmospheric pressure.…”

“…The water contact angle of the vapor-annealed perovskite films increased from 85.9° to 114.2°, facilitating better contact with the hole transport layer interface and reducing the possibility of water intrusion that enhance the stability of the film. 11 Atomic force microscopy (AFM) was employed to assess the roughness and morphology of the perovskite surface (Fig. 1d–f).…”

“…[1][2][3][4][5] In recent years, there has been a growing focus on regulating residual stress in perovskite lms, as it directly impacts defect formation. [6][7][8][9] Numerous studies have revealed that adjusting residual stress in thin lms can not only modify the electron band structure within lead iodide octahedra, 10,11 but more importantly, improve the phase stability of the lm from a thermodynamic perspective. 12,13 It is widely recognized that solution-based techniques offer a convenient and efficient method for depositing high-quality perovskite lms, making them extensively used in highperformance PSC devices.…”

“…1–5 In recent years, there has been a growing focus on regulating residual stress in perovskite films, as it directly impacts defect formation. 6–9 Numerous studies have revealed that adjusting residual stress in thin films can not only modify the electron band structure within lead iodide octahedra, 10,11 but more importantly, improve the phase stability of the film from a thermodynamic perspective. 12,13…”

Fabrication of water-resistant fluorescent ink using the near-unity photoluminescence quantum yield of CsPbBr3 doped with NiBr2

“…All-inorganic lead halide perovskites (LHPs) CsPbX 3 (X = Br, Cl, I) have attracted enormous research interest recently owing to their excellent physical and optoelectronic properties originating from their direct optical band gap, 1 large optical absorption coefficient, 2,3 long-range diffusion length, 4 high charge carrier mobility, 5 high photoluminescence quantum yield (PLQY), 6 narrow photoluminescence (PL) linewidth, 7 and wide colour gamut. [1][2][3][4][5] These interesting properties bring great potentiality [8][9][10][11] towards various optoelectronic applications like photovoltaics, 12,13 light-emitting diodes, [14][15][16] single-photon sources, [17][18][19] X-ray scintillators, 20 and lasers. 21 However, the sensitivity of LHPs to oxygen and moisture is an obstacle for realistic applications.…”