Solution-processed perovskite solar cells

Improving Stability of Lead Halide Perovskite via PbF2 Layer Covering

“…Lead halide perovskites attracted much attention in recent years due to their good photoelectric performance, such as a long-range balanced charge-carrier diffusion length, a high charge-carrier mobility, a high absorption coefficient, and a small exciton binding energy. − It is reported by the Korea Research Institute of Chemical Technology and Massachusetts Institute of Technology that the highest power conversion efficiency (PCE) of perovskite solar cells (PSCs) reaches the certified value of 25.2%. However, the long-term instability issue of PSCs under ambient atmosphere is still a key obstacle for their further commercialization applications. − Lead halide perovskite is usually unstable under the stimulation of water, oxygen, and light. , The soft crystal lattice of perovskites is easily decomposed owing to their weak bonding nature. , The perovskite components can easily penetrate into the charge transport layer and decrease the charge extraction. , …”

Ferroic alternation in methylammonium lead triiodide perovskite

“…24,25 Organometal halide (OMH) perovskites are a family with a chemical formula of ABX 3 , where A is an organic group, B is Pb or Sn, and X is a halogen, I, Br, or Cl. Due to their excellent roomtemperature properties, such as tuneable bandgap, large absorption coefficient, ambipolar charge transport, high carrier mobility, and long carrier-diffusion length, OMH perovskites, [26][27][28][29][30][31][32][33][34][35] especially the methylammonium lead triiodide (MAPbI 3 ), 29,31,32 have attracted the most attention among photoelectric materials. Since the first application as sensitizers in mesostructured cells by Kojima and coworkers in 2009, the power conversion efficiency (PCE) of OMHs has dramatically increased from 3.8% to more than 25.5% to date, according to the "Best Research-Cell Efficiency Chart."…”

Revealing the microstructure evolution of inorganic CsPbI2Br perovskite via synchrotron radiation grazing incidence X‐ray diffraction

“…However, the stability issue is still one of the important factors hindering the further commercialization of PSCs. [ 2 ] As compared to organic‐inorganic hybrid perovskites, cesium‐based all‐inorganic perovskites have better stability in terms of light and heat resistance, thereby promising to greatly improve the stability of PSCs. [ 3–5 ] However, it is still very challengeable to achieve efficient and stable all‐inorganic PSCs because of the large bandgap and spontaneous phase transition of perovskite.…”

“…[12][13][14][15] It mainly has three main objectives: (i) removing residual solvents after solution processing; (ii) promoting conversion from precursors to perovskite; (iii) increasing crystallinity and promoting the growth of perovskite crystal grains. [16][17][18][19][20] The post-annealing parameters, including temperature, duration and atmosphere, have critical effects on the crystallization, morphology of perovskite film and device performance. Therefore, it is very meaningful to investigate the crystallization mechanism and microstructure evolution of perovskite film during post-annealing for improving device performance and reproducibility.…”