Spectacular Enhancement of the Thermal and Photochemical Stability of MAPbI3 Perovskite Films Using Functionalized Tetraazaadamantane as a Molecular Modifier

Abstract

Perovskite solar cells represent a highly promising third-generation photovoltaic technology. However, their practical implementation is hindered by low device operational stability, mostly related to facile degradation of the absorber materials under exposure to light and elevated temperatures. Improving the intrinsic stability of complex lead halides is a big scientific challenge, which might be addressed using various “molecular modifiers”. These modifiers are usually represented by some additives undergoing strong interactions with the perovskite absorber material, resulting in enhanced solar cell efficiency and/or operational stability. Herein, we present a derivative of 1,4,6,10-tetraazaadamantane, NAdCl, as a promising molecular modifier for lead halide perovskites. NAdCl spectacularly improved both the thermal and photochemical stability of methylammonium lead iodide (MAPbI3) films and, most importantly, prevented the formation of metallic lead Pb0 as a photolysis product. NAdCl improves the electronic quality of perovskite films by healing the traps for charge carriers. Furthermore, it strongly interacts with the perovskite framework and most likely stabilizes undercoordinated Pb2+ ions, which are responsible for Pb0 formation under light exposure. The obtained results feature 1,4,6,10-tetraazaadamantane derivatives as highly promising molecular modifiers that might help to improve the operational lifetime of perovskite solar cells and facilitate the practical implementation of this photovoltaic technology.

Iron(iv) complexes with tetraazaadamantane-based ligands: synthesis, structure, applications in dioxygen activation and labeling of biomolecules

“…CH 2 Cl 2 and Et 3 N were distilled over CaH 2 ; THF was distilled over LiAlH 4 ; other solvents were distilled without drying agents. TAAD, 23 TAAD·HCl, 58 (3β)-21-bromo-20-oxopregna-5,16-dien-3-yl acetate ( 2a ), 59 quaternary salt 4a , 57 2-bromoacetyl chloride 60 and polymer PS-CH 2 -TAAD 27 were prepared according to previously described protocols. 1,4,7-Triazacyclononane trihydrochloride (TACN·3HCl), 1,8-bis(dimethylamino)naphthalene (proton sponge), glycylglycylglycine, p -thiocresol, n -heptanethiol, glutathione and all inorganic reagents were commercial grade and used as received.…”

Iron(IV) Complexes with Tetraazaadamantane-based Ligands: Synthesis, Structure, Application in Dioxygen Activation and Labeling of Biomolecules

“…THF was distilled over LiAlH 4 ; other solvents were distilled without drying agents. TAAD, 23 TAAD•HCl, 43 (3β)-21-Bromo-20-oxopregna-5,16-dien-3-yl acetate (2a), 44 quaternary salt 4a, 40 2-bromoacetyl chloride 45 and polymer PS-CH 2 -TAAD 27 were prepared according to previously described protocols. 1,4,7-Triazacyclononane trihydrochloride (TACN•3HCl), 1,8-bis(dimethylamino)naphthalene (proton sponge), glycylglycylglycine, p-thiocresol, n-heptanethiol, glutathione and all inorganic reagents were commercial grade and used as received.…”

Superior hydrophobic silica-coated quantum dot for stable optical performance in humid environments

“…To date, different methods have been reported to alleviate the vulnerability of QD, such as surface ligand modification, encapsulating in particle, coating of shell, binding with matrix, and packaging engineering. Some researchers found more stable and proper ligands for QD [7][8][9], such as moisture-tolerant molecules. Others encapsulated QD in silicon dioxide (SiO 2 ) particles [10][11][12], waterproof aerogels [13], mesoporous particles [14,15], and so on.…”