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Graduate Student Seminar -5/03/2019

"Near Infrared Photoresponse from Co-sputtered AuAg Alloy Thin Films"

by Lisa Krayer

Advisor:  Associate Professor Jeremy Munday

Friday, May 3, 2019 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Abstract: Hot carrier generation and collection in metal films can expand the bandwidth of semiconductor photodetection, reduce the activation energy required for water splitting, minimize the power loss from thermalization of high energy photons in solar cells, and enable low energy, non-destructive optical sensing of biological molecules. Efficient hot carrier generation and collection from a Schottky barrier photodiode requires (i) high absorption within the metal film, (ii) preferential carrier excitation from free carriers at the fermi-level as opposed to lower energy states such as the d-band states, (iii) lossless transport of the excited carriers to the metal interface, and (iv) low resistance emission of the carriers over the potential barrier at the interface. Unfortunately, there are no elemental metals that satisfy all these requirements. In this talk I will explore the possibility of tailoring both the optical and electrical properties of metals through alloying. Specifically, I will discuss the tunable properties of co-sputtered Au and Ag alloys for near-infrared photodetection.

For additional information about the IREAP Graduate Student Seminars, contact Artur Perevalov.

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