A potassium thiocyanate additive for hysteresis elimination in highly efficient perovskite solar cells

Abstract

Potassium thiocyanate as a cheap additive effectively eliminates the hysteresis effect of perovskite solar cells.

Melamine-based functionalized graphene oxide and zirconium phosphate for high performance removal of mercury and lead ions from water

“…It is clear that the XRD pattern of MT is completely different from those of melamine and KSCN which can be used as evidence for the formation of crystalline MT by the acid-catalyzed reaction between melamine and KSCN. 28,29 The FTIR spectra, displayed in Fig. 1(b), show the N-H stretching and bending vibrations of melamine in the region of 3000-3500 and 1640 cm À1 , respectively.…”

“…The peaks between 1433-1533 and 810 cm À1 are assigned to the C-N stretching and bending vibrations, respectively, and the triazine ring vibrations appear at 1021 and 578 cm À1 . 28,29 The KSCN spectrum shows the two characteristic peaks at 2046 and 1641 cm À1 due to C]S stretching and bending vibrations, respectively. 28 However, the MT spectrum shows all the peaks assigned to the C]S, N-H, C-N, and triazine vibrations in addition to two new peaks at 1173 and 655 cm À1 that can be assigned to the C-S stretching and bending vibrations, respectively.…”

“…28,29 The KSCN spectrum shows the two characteristic peaks at 2046 and 1641 cm À1 due to C]S stretching and bending vibrations, respectively. 28 However, the MT spectrum shows all the peaks assigned to the C]S, N-H, C-N, and triazine vibrations in addition to two new peaks at 1173 and 655 cm À1 that can be assigned to the C-S stretching and bending vibrations, respectively. 24 These peaks are not present in the melamine nor in the KSCN spectrum thus conrming the formation of the MT chelating ligand.…”

Alkali Salts as Interface Modifiers in n‐i‐p Hybrid Perovskite Solar Cells

“…To resolve these issues, efforts have been made to modify the metal‐oxide/perovskite interface as well as introducing additives to mitigate ionic defects in the perovskite absorber layer. With respect to the latter, several studies have shown alkali metals (Li, Na, K, Rb, and Cs) introduced as additives in the perovskite precursor solution to increase device performance and reduce hysteresis . Very few studies have introduced these alkali metal salts directly to the interface, where defects predominantly reside.…”

Thiocyanate-Treated Perovskite-Nanocrystal-Based Light-Emitting Diodes with Insight in Efficiency Roll-Off

“…For another example, with inorganic halide ionic compounds pAssivating CsPbBr 3 NCs before purification with anti-solvent, the up-to-date highest EQE for perovskite NCs has been achieved [6]. Salts containing thiocyanate (SCN) have been demonstrated to be able to increase grain size and reduce defects in perovskite thin film [25] and have shown beneficial effects on stability [26], device performance and suppression of hysteresis in solar cell [27]. SCN, as a kind of pseudohalide, has also presented efficient pAssivation effect on perovskite NCs [28].…”