Enhanced control of self-doping in halide perovskites for improved thermoelectric performance

Metal halide perovskites have emerged as promising photovoltaic materials, but, despite ultralow thermal conductivity, progress on developing them for thermoelectrics has been limited. Here, we report the thermoelectric properties of all-inorganic tin based perovskites with enhanced air stability. Fine tuning the thermoelectric properties of the films is achieved by self-doping through the oxidation of tin (ΙΙ) to tin (ΙV) in a thin surface-layer that transfers charge to the bulk. This separates the doping defects from the transport region, enabling enhanced electrical conductivity. We show that this arises due to a chlorine-rich surface layer that acts simultaneously as the source of free charges and a sacrificial layer protecting the bulk from oxidation. Moreover, we achieve a figure-of-merit (ZT) of 0.14 ± 0.01 when chlorine-doping and degree of the oxidation are optimised in tandem

Fullerene C₆₀ as an Endohedral Molecule within an Inorganic Supramolecule

C60⊂[Cu26Cl26L2{Cp*Fe(η5-P5)}13(CH3CN)9] (L = H2O) represents a first example of a complete encapsulation of C60 itself by an inorganic fullerene-like system via molecular recognition of the five- and sixfold-symmetric structural motif of C60. The product exhibits an inorganic cover consisting of 99 inorganic core atoms from pentaphosphaferrocene and Cu(I) chloride building blocks. This is the first instance of a hollow structure that completely encapsulates C60. The overall spherical molecule possesses an outer diameter of 2.3 nm and shows a remarkable electronic interaction between C60 and the encapsulating giant molecule

Fullerene C₆₀ as an Endohedral Molecule within an Inorganic Supramolecule

C60⊂[Cu26Cl26L2{Cp*Fe(η5-P5)}13(CH3CN)9] (L = H2O) represents a first example of a complete encapsulation of C60 itself by an inorganic fullerene-like system via molecular recognition of the five- and sixfold-symmetric structural motif of C60. The product exhibits an inorganic cover consisting of 99 inorganic core atoms from pentaphosphaferrocene and Cu(I) chloride building blocks. This is the first instance of a hollow structure that completely encapsulates C60. The overall spherical molecule possesses an outer diameter of 2.3 nm and shows a remarkable electronic interaction between C60 and the encapsulating giant molecule