Thermochromic Perovskite Inks for Reversible Smart Window Applications

Abstract

Movie S1: Heating process (AVI) Movie S2: Cooling process (AVI) Experimental methods; XRD patterns of MABr and MAI; bandgap calculation; conversion dynamics (PDF)

Engineering Halide Perovskite Crystals through Precursor Chemistry

“…MAPbX 3 perovskites show an inverse temperature solubility behavior in certain solvents, high‐quality single crystals of MAPbBr 3 and MAPbI 3 forming at an elevated temperature in DMF and gamma‐butyrolactone (GBL) solutions, respectively . A completely reversible chromatic variation ranging from yellow to black of the perovskite precursor solution in GBL under different temperatures was also reported . These results further confirm that changes in coordination complex species occur due to shifts of equilibria among the iodoplumbate complexes.…”

Reversible Thermochromism and Strong Ferromagnetism in Two‐Dimensional Hybrid Perovskites

“…For (BED) 2 CuCl 6 , the absorption edges were observed at 574 nm, 617 nm, 659 nm, and 677 nm, upon heating to 303 K, 363 K, 423 K, and 443 K, respectively. The red shift of the absorption edge with the temperature rise confirms the chromatic variation of the samples . By extrapolating the linear region of the absorption edge to the energy‐axis intercept, we have determined the optical band gaps of the two crystals.…”

“…When heated to the temperatures of 303 K, 333 K, 363 K, and 383 K, the absorption edges of the (PED)CuCl 4 were observed at 596 nm, 613 nm, 635 nm, and 659 nm, respectively.F or (BED) 2 CuCl 6 ,t he absorption edges were observed at 574 nm, 617 nm, 659 nm, and 677 nm, upon heating to 303 K, 363 K, 423 K, and 443 K, respectively.T he red shift of the absorption edge with the temperature rise confirms the chromatic variation of the samples. [36] By extrapolating the linear region of the absorption edge to the energy-axis intercept, we have determined the optical band gaps of the two crystals.For (PED)CuCl 4 ,the band gap changed from 2.08 eV to 1.88 eV when the temperature varied from 303 Kt o3 83 K. In comparison, the band gap of the (BED) 2 CuCl 6 reduced from 2.16 eV to 1.83 eV, when the temperature varied from 303 Kt o4 43 K ( Figure S6,S7). This band gap narrowing is consistent with the observed color changes at different temperatures.…”

Efficient Photon Recycling and Radiation Trapping in Cesium Lead Halide Perovskite Waveguides

“…It relies on a high radiative efficiency in CsPbBr3 perovskite microwires and provides crucial information about the potential impact of photon recycling and waveguide trapping on optoelectronic properties of cesium lead halide perovskite materials. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 3 Solution-processed organic-inorganic hybrid perovskite-based semiconductors have rapidly progressed as versatile and promising materials for low-cost and high-performance optoelectronics applications in the past five years [1][2][3][4][5][6][7][8][9][10][11] due to their remarkable light absorption 12 , long carrier diffusion length 12,13 , controllable dimensionalities [14][15][16][17][18][19][20][21] and tunable bandgaps. 22 Recently, all inorganic CsPbX3 (X=Br  , I  or Cl  ) perovskites have attracted part...…”