A mild biomolecule-assisted route for preparation of flower-like AgBiS2 crystals

Homogenously hexagonal prismatic AgBiS2nanocrystals: controlled synthesis and application in quantum dot-sensitized solar cells

“…12 The peaks at 163.7 and 158.1 eV correspond to Bi4f 5/2 and Bi4f 7/2 , and the peak at 161.31 eV can be attributed to Bi5s binding energy, matching well with Bi. 13,14 The binding energy of S2s is located at 225.4 eV. 4 Similar results are also observed in the previous studies on AgBiS 2 .…”

“…4 Similar results are also observed in the previous studies on AgBiS 2 . 13,14 In general, the growth of nanocrystals is usually followed by the crystal habit and reaction conditions, and the shape of a face-centered cubic (fcc) nanocrystal is mainly determined by the growth rates along the <200> direction and the <222> direction. 15 The driving force for the transformation from a cube to a polyhedron lies in the fact that the growth rate along the <200> direction is higher than that along the <222> direction, since the free energy of {200} facets is obviously higher than that of the {222} facets.…”

Cubic AgBiS2 Colloidal Nanocrystals for Solar Cells

“…According to the diffractogram in Figure b, all samples exhibit a cubic structure, previously described as the high-temperature β-phase as compared to the trigonal low-temperature phase described elsewhere . There is a small change in the relative intensity ratios for the (111) and (200) peaks as well as peak broadening indicative of nanocrystal size.…”

“…According to the diffractogram in Figure 8b, all samples exhibit a cubic structure, previously described as the hightemperature β-phase 41 as compared to the trigonal lowtemperature phase described elsewhere. 46 There is a small change in the relative intensity ratios for the (111) and (200) peaks as well as peak broadening indicative of nanocrystal size. The decrease in peak broadening and the improved signal-tonoise ratio in AgBiS 2 NCs synthesized with a lower Ag:Bi ratio is further indicative of larger particle size and/or an improvement in crystallinity.…”

“…AgBiS 2 has also been studied as a solar cell material in a few reports and found to be of potential interest, − and solar cells based on NCs of this material have resulted in PCE above 6% . AgBiS 2 has been shown to have two phases: a low-temperature α-phase which has a trigonal-hexagonal structure as well as a high-temperature β-phase with a cubic structure . Moreover, the high-temperature phase has also been obtained when the nanocrystal size is below 10 nm, even though the synthesis temperature is much lower than that of the phase transition temperature …”