Halogen Bonding in Perovskite Solar Cells: A New Tool for Improving Solar Energy Conversion

Abstract

Hybrid organic–inorganic halide perovskites (HOIHPs) have recently emerged as a flourishing area of research. Their easy and low‐cost production and their unique optoelectronic properties make them promising materials for many applications. In particular, HOIHPs hold great potential for next‐generation solar cells. However, their practical implementation is still hindered by their poor stability in air and moisture, which is responsible for their short lifetime. Optimizing the chemical composition of materials and exploiting non‐covalent interactions for interfacial and defects engineering, as well as defect passivation, are efficient routes towards enhancing the overall efficiency and stability of perovskite solar cells (PSCs). Due to the rich halogen chemistry of HOIHPs, exploiting halogen bonding, in particular, may pave the way towards the development of highly stable PSCs. Improved crystallization and stability, reduction of the surface trap states, and the possibility of forming ordered structures have already been preliminarily demonstrated.

Halide Perovskites for Photoelectrochemical Water Splitting and CO2 Reduction: Challenges and Opportunities

“…Surface passivation has also been used to improve the optoelectronic properties as well as the stability of halide perovskites. Ionic defects, organic cations, and insufficiently coordinated halide anions, on the surface of perovskites act as trap sites and cause faster degradation. , Supramolecular passivating agents have been introduced to control these defect; molecules with Lewis acid (electron acceptor) and Lewis base (electron donor) features can successfully attach on the perovskite surface and form halogen bonds, which help to reduce charge-trapping sites, improve the crystallinity of the perovskite, and thus increase stability. ,− Even all these strategies are going to improve the intrinsic stability of MHPs, the use of better encapsulates like graphite-epoxy paste or other protection methods against moister may be still needed.…”

Bandgap modification in 0D tellurium iodide perovskite derivatives via incorporation of polyiodide species

“…band gap) of perovskites or perovskite derivatives. 4,5 Halogen bonding in particular has also been utilized to improve the stability, quality, and overall efficiency of halide perovskite photovoltaics, 6 and systematic interrogation of new compositions and structural motifs will serve to advance understanding in these areas. Zerodimensional (0D) halide perovskite derivatives, consisting of entirely discrete metal halide octahedra separated by cations (both organic and inorganic) are increasingly relevant to the applications mentioned above.…”

“…10,11 0D perovskite derivatives are attractive for use as solar materials, and scintillators in particular, which require a high degree of stability while retaining desirable photophysical properties. [6][7][8] Pb, Sn, Bi, Sb e.g. are all frequently explored as components of low dimensional perovskites with properties appropriate for these applications.…”

Elevating the Photothermal Conversion Efficiency of Phase-Change Materials Simultaneously toward Solar Energy Storage, Self-Healing, and Recyclability

“…The problems of resource shortage and environmental pollution have become more and more severe in recent years. − To address this predicament, researchers have been devoting themselves to developing and utilizing various renewable and clean energy sources, such as wind energy, , water energy, , and solar energy. − Solar energy is an inexhaustible source of clean energy among the most abundant energy source and can usually be used everywhere without geographical limitation. Therefore, a reasonable and efficient application of solar energy is of great significance to relieve the energy crisis caused by the exhaustion of fossil energy. − The current research hotspots in the field of solar energy development and utilization are mainly focused on photoelectric conversion, photothermal conversion, and solar photocatalysis. − Among them, solar photothermal conversion technology has attracted much attention because of its high energy conversion efficiency, low cost, and environmental protection and has been widely used in the fields of solar thermal power generation, solar thermal effects, and seawater desalination. − …”