Ultra-Fast Synthesis for Ag2Se and CuAgSe Thermoelectric Materials

High-Performance Ag–Se-Based n-Type Printed Thermoelectric Materials for High Power Density Folded Generators

“…The magnitude of S of the films with x ≥ 0.30 was found to be significantly higher compared to that of bulk Ag 2 Se which amounts to 140 μV K −1 . 34 The highest power factor of ∼400 μW m −1 K −2 was achieved for the composition with x = 0.60. Because of the formation of a volatilized phase of Se before forming the Ag 2 Se phase through the dissociative adsorption of Se by Ag, no defined grain boundaries were formed as seen in the SEM images (see Figure 3b,c).…”

“…The RT transport parameters Hall coefficient (R H ), Hall mobility (μ H ), and carrier concentration (n H ) were determined for our film by measuring the Hall voltage (V H ) at 2.5 T. R H is found to be ∼2.8 × 10 −5 m 3 C −1 , whereas n H is estimated to be ∼2.2 × 10 23 m −3 for the printed (0.3)Ag−(0.7)Se-based TE film. The Hall carrier concentration was found to be lower by 1 order of magnitude compared to that of the bulk value 34 because of the presence of the binder and the excess Se which leads to lower conductivity and higher S. μ H is calculated using the Hall coefficient which is found to be ∼3.2 × 10 3 cm 2 V −1 s −1 . The value of μ H is similar to that for bulk Ag 2 Se which signifies the formation of the high carrier mobility percolation path of the Ag 2 Se phase.…”

“…Here, we target Ag 2 Se-based TE materials to make them printable, preserving their high TE performance. 34 We also demonstrate a flexible folded TEG (flexTEG) fabricated with Ag−Se-based ink as n-type legs and commercially available PEDOT:PSS PH1000 as p-type legs manufactured using a printing/folding approach.…”

“…Although high-performance flexible Ag 2 Se TE film has been prepared using other techniques such as magnetron sputtering and vacuum-assisted filtration of dispersed Ag 2 Se nanowires on a nylon membrane, , any printable Ag–Se-based TE material has not been reported. Here, we target Ag 2 Se-based TE materials to make them printable, preserving their high TE performance . We also demonstrate a flexible folded TEG (flexTEG) fabricated with Ag–Se-based ink as n-type legs and commercially available PEDOT:PSS PH1000 as p-type legs manufactured using a printing/folding approach.…”

New frontier in printed thermoelectrics: formation of β-Ag2Se through thermally stimulated dissociative adsorption leads to high ZT

“…Bulk Ag 2 Se chalcogenides are known to exhibit high TE performance at RT. 26 In addition, through dissociative adsorption of Se by Ag, the Ag 2 Se phase is formed at lower temperatures, benecial for printing technology. 27 Previously, various other intricate methods, for example magnetron sputtering 28 and vacuum-assisted ltration, [29][30][31] have been used to prepare high performance exible Ag 2 Se TE lms.…”