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SUMMARY:Tandem Solar Cells: Exploring Options and Unlocking Opportunities 
 for New Applications - Emily L. Warren\, National Renewable Energy Laborat
 ory\, Golden\, CO USA
DTSTART:20250901T100000Z
DTEND:20250901T110000Z
UID:TALK234676@talks.cam.ac.uk
CONTACT:89851
DESCRIPTION:Tandem solar cells can achieve higher efficiencies than single
  junction cells because they can absorb different spectral ranges of sunli
 ght more efficiently using multiple semiconductor bandgaps. I will discuss
  promising approaches to advance tandem photovoltaics (PV) and the potenti
 al for photoelectrochemical applications of these devices. For PV\, I will
  outline the different possible material combinations and electrical/optic
 al interconnections for sub-cells in a tandem device. Each approach has tr
 ade-offs in efficiency\, cost\, manufacturability\, and energy yield. Whil
 e most of the research on tandem PV has focused on 2-terminal (2T) devices
 \, interest in four-terminal (4T) and three-terminal (3T) tandems is growi
 ng. 3T and 4T designs offer advantages over 2T\, such as avoiding cell pol
 arity restrictions\, current-matching\, and improving energy yields\, but 
 they complicate module circuitry. I will discuss NREL’s experimental and
  modeling approaches to understand the most promising tandem options. \nMu
 lti-terminal devices also enable new applications outside of traditional e
 lectricity generation. The direct use of semiconductors to drive photoelec
 trochemical reactions is a promising approach create liquid/hydrocarbon pr
 oducts that can be used as fuels or chemical feedstocks without relying on
  traditional petrochemical processes. I will show how 3T photoelectrodes c
 an improve device stability under day/night cycling\, and how tandem devic
 es based on III-V semiconductors can be used to drive cascade chemical rea
 ctions by creating multiple catalytic microenvironments in a single photoe
 lectrochemical device.\n\nBio: Emily Warren is a research group manager an
 d senior scientist at the National Renewable Energy Laboratory\, in Colora
 do\, USA where she leads the Performance and Tandems group\, that focuses 
 on the fabrication and measurement of high efficiency photovoltaic devices
 . Her research interests include optoelectronic modeling of tandem solar c
 ells\, heteroepitaxy of III-Vs on Si\, and the photoelectrochemical produc
 tion of solar fuels. Her work helps to push the boundaries of what is poss
 ible for converting solar energy into usable energy. She received her PhD 
 from the California Institute of Technology\, an MPhil from the University
  of Cambridge in Engineering for Sustainable Development\, and a bachelor
 ’s degree in chemical engineering from Cornell University\n
LOCATION:Cluster Seminar Room\, Ray Dolby Centre\, Cavendish Laboratory\, 
 JJ Thomson Avenue\, CB3 0US
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