(Invited) Material Porosity
Authors: O'Dwyer Colm 
Published: November 2022

We really like pores in our research group. Big pores, small pores, ordered pores, random pores – they all have a function and as is often found, show behaviour that is not always predicted. I started my research journey trying to put extremely thin films onto near-perfect III-V crystals to control (opto)electronic properties and when the first TEM on our campus showed the image in Fig. 1 almost 21 years ago (1,2), the electrochemical modification of the InP made more sense. In this talk, I will summarise the journey from porous InP that led to studies of other porous semiconductors such as silicon (3-10) and GaN (11-15), periodically ordered photonic crystal porous structures (16-26) and some optical, thermal and electrochemical properties photocatalysis, batteries and related that were modified by the porous structure, leading up to the most recent porous materials (27).

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Figure 1. Bright field TEM of a cross section of an InP electrode after a potential sweep from 0.0 to 0.44 V (SCE) in 5 mol dm-3 KOH at 2.5 mV s-1. The plane of the micrograph is (011).

Figure 1