Incorporation of Conjugated Diynes in Perovskites and their Post‐Synthetic Modification

Abstract

Two‐dimensional (2D) organic–inorganic hybrid perovskites have rapidly become an attractive alternative to three‐dimensional (3D) perovskites as solar cell absorbers, owing to their improved stability, versatility, and ease of processing. Despite their advantages, the insulating nature of the organic cations makes these materials have lower absorbing and conducting properties, resulting in lower device efficiencies. A way to circumvent these issues is the integration of functional molecules that help mitigate these limitations. In this study, six new perovskites composed of three distinct diynes are synthesized, all of which can be thermally polymerized to form conjugated polymers within the perovskite layers. The incorporation of conjugated polymers results in drastic changes in these materials’ optoelectronic properties and their overall stability. Furthermore, depending on the nature of the diyne and the inorganic layers, the materials show varying polymerization yields, optical bandgaps, and charge carrier densities. These results afford significant insight into the chemical nature of the polymerized species and thus highlight the versatility of this approach to post‐synthetically generate conducting polymers within the layers of 2D perovskites, paving the way toward their use in optoelectronic devices.

2D and quasi-2D hybrid perovskites containing organic cations with an extended conjugated system: opportunities and challenges

“…In a follow-up paper, six new 2D HOIPs composed of three distinct diynes were synthesised, all showing a reduced bandgap upon doping with oxygen and the presence of free radicals. 36 In summary, both the in-plane as well as the out-of-plane charge carrier transport of 2D and quasi-2D HOIPs can be enhanced by incorporating organic cations with an extended conjugated system.…”

“…In a follow-up paper, six new 2D HOIPs composed of three distinct diynes were synthesised, all showing a reduced bandgap upon doping with oxygen and the presence of free radicals. 36…”