Organic-inorganic electronics

Abstract

Organic-inorganic hybrid materials enable the integration of useful organic and inorganic characteristics within a single molecular-scale composite. Unique electronic and optical properties have been observed, and many others can be envisioned for this promising class of materials. In this paper, we review the crystal structures and physical properties of one family of crystalline, self-assembling, organic-inorganic hybrids based on the layered perovskite framework. In addition to exhibiting a number of potentially useful properties, the hybrids can be deposited as thin films using simple and inexpensive techniques, such as spin coating or singlesource thermal ablation. The relatively new field of "organic-inorganic electronics" offers a variety of exciting technological opportunities. Several recent demonstrations of electronic and optical devices based on organic-inorganic perovskites are presented as examples.

Tunable optical properties of hybrid inorganic–organic [(TiO2)m(Ti–O–C6H4–O–)k]n superlattice thin films

“…7(c)). The value 3.6 g/cm 3 obtained for the present pure TiO2 thin film approaches the density of bulk anatase 29 3.84 g/cm 3 . This is in line with the previously reported values 3.39-3.76 g/cm 3 for ALD-fabricated TiO2 films 30 and is in agreement with our XRD data that confirmed growth of anatase phase TiO2.…”

“…The value 3.6 g/cm 3 obtained for the present pure TiO2 thin film approaches the density of bulk anatase 29 3.84 g/cm 3 . This is in line with the previously reported values 3.39-3.76 g/cm 3 for ALD-fabricated TiO2 films 30 and is in agreement with our XRD data that confirmed growth of anatase phase TiO2. The value 1.6 g/cm 3 for the m=0 hybrid indicates a dramatic decrease in density compared to the purely inorganic films and compares well with the values of around 1.5-2.0 g/cm 3 reported previously for similar types of hybrid films 14,20,21,27 .…”

“…line with electron density for increasing fraction of organic content and the control over the k:m ratio enabled precise control over the material's density from 3.6 g/cm 3 for pure TiO2 to 1.6 g/cm 3 for the m=0 hybrid ( Fig. 7(c)).…”

“…[1][2][3] Among the hybrid materials, inorganic-organic superlattices constitute a particularly interesting material family, as the compositional synergies provided by the hybrid framework are combined with the freedom to tune the dimensions of the inorganic and organic material domains in nanoscale by controlling the superlattice period. 4,5 Thereby, enhanced control over the material properties, including quantum effects, is enabled in hybrid superlattices.…”

“…Such condition is met by transporting the precursor 3 vapors to the substrate one after another and purging the reactor chamber after each precursor pulse with flowing inert gas. A sequence consisting of at least two precursor pulses and subsequent purging for each precursor is called an ALD cycle.…”