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SUMMARY:Computationally Driven Design of New and Improved Transparent Cond
 ucting Oxides - Dr David Scanlon\, University College London
DTSTART:20180524T131500Z
DTEND:20180524T141500Z
UID:TALK101728@talks.cam.ac.uk
CONTACT:Bartomeu Monserrat
DESCRIPTION:The combination of electrical conductivity and optical transpa
 rency in a single material gives transparent conducting oxides (TCOs) an i
 mportant role in modern optoelectronic applications such as in solar cells
 \, flat panel displays\, and smart coatings. The most commercially success
 ful TCO so far is tin doped indium oxide (Indium Tin Oxide – ITO)\, whic
 h has become the industrial standard TCO for many optoelectronics applicat
 ions\; the ITO market share was 93% in 2013. Its widespread use stems from
  the fact that lower resistivities have been achieved in ITO than in any o
 ther TCO\; resistivities in ITO have reached as low as 7.2 × 10-5Ω cm\, 
 while retaining >90% visible transparency. In recent years\, the demand fo
 r ITO has increased considerably\, mainly due to the continuing replacemen
 t of cathode ray tube technology with flat screen displays. However\, indi
 um is quite a rare metal\, having an abundance in the Earth’s crust of o
 nly 160 ppb by weight\, compared with abundances for Zn and Sn of 79000 pp
 b and 2200 ppb respectively\, and is often found in unstable geopolitical 
 areas. The overwhelming demand for ITO has led to large fluctuations in th
 e cost of indium over the past decade. There has thus been a drive in rece
 nt years to develop reduced-indium and indium-free materials which can rep
 lace ITO as the dominant industrial TCO. In this talk I will outline the s
 trategies that we use in the Materials Theory Group to look beyond the cur
 rent TCO materials\, highlighting the interplay of theory and experiment.\
 n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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