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DTSTAMP:20261109T082047Z
SUMMARY:Nanoscale Solar Energy Converters
DESCRIPTION:<p style="text-align: center\;"><span style="color: #800000\; f
 ont-size: 12pt\;"><strong>NOTE: THIS SEMINAR WAS HELD ONLINE<br><br></stro
 ng></span><strong>Find it here: <a title="ICN2 #StayAtHome Seminars" href=
 "https://youtu.be/h-yy7oZgLmg" target="_blank" rel="noopener noreferrer">h
 ttps://youtu.be/h-yy7oZgLmg</a></strong></p>\n<p style="text-align: center
 \;"><strong>Welcome to the first ICN2 #StayAtHome Seminar!</strong></p>\n<
 p>&nbsp\;</p>\n<p style="text-align: justify\;">By&nbsp\;<strong>Prof. And
 ers Hagfeldt\,&nbsp\;</strong>Professor in Physical Chemistry at Laborator
 y of Photomolecular Science\, Swiss Federal Institute of Technology Lausan
 ne (EPFL)\, Switzerland</p>\n<p style="text-align: justify\;"><strong>Abst
 ract</strong>:&nbsp\;In this talk I will overview the virtue of nanomateri
 als for solar energy conversion using as examples dye-sensitized (DSSC) an
 d perovskite solar cells (PSC) as well as Cu2O photoelectrodes for hydroge
 n production.</p>\n<p style="text-align: justify\;">Some years back my res
 earch group at Uppsala University\, Sweden\, introduced alkoxy functionali
 zed donor groups as a building block in organic dyes as light harvesters f
 or DSSC. This donor group provides a desirable 3-dimensional structure tha
 t aids in surface protection of electrons injected into the semiconductor 
 from oxidants in the electrolyte\, allowing for record-setting cobalt- and
  copper-based redox shuttles to be utilized more frequently. With these sy
 stems we recently set the world record efficiency for DSSC of 12.25%. DSSC
 s are ideally suited for ambient light and indoor applications where effic
 iencies up to 35% have been reached calculated with respect to the fluores
 cent light source.</p>\n<p style="text-align: justify\;">In our work on pe
 rovskite solar cells (PSC) we have achieved efficiencies above 23% with a 
 mixed composition of iodide/bromide and organic and inorganic cations. Wit
 h the use of SnO2 compact underlayers as electron acceptor contacts we hav
 e constructed planar perovskite solar cells with a hysteresis free efficie
 ncy above 22%. Through compositional\, engineering larger perovskite grain
 s grown in a monolithic manner are observed and reproducibility and device
  stability are improved. With regards to lifetime testing\, we have shown 
 a promising stability at 85 oC for 500 h under full solar illumination and
  maximum power point tracking (95% of the initial performance was retained
 ). Our present main directions of developing passivation interface layers 
 and all-inorganic perovskite materials will be discussed in the lecture.</
 p>\n<p style="text-align: justify\;">The state-of-the-art Cu2O photocathod
 e employs gold as the back contact which\, besides being expensive\, can l
 ead to considerable electron-hole recombination. Recently\, we presented a
  Cu2O photocathode with overall improved performance\, enabled by using so
 lution-processed CuSCN as hole transport material. Owing to multiple advan
 tages of applying CuSCN as the hole transport layer\, a standalone solar w
 ater splitting tandem cell was built\, delivering a solar-to-hydrogen effi
 ciency of 4.55%..</p>\n<p style="text-align: justify\;">Hosted by&nbsp\;<s
 trong>Dr Mónica Lira Cantu</strong> Nanostructured Materials for Photovol
 taic Energy Group\, ICN2</p>
DTSTART:20200324T140000
DTEND:20200324T225959
LOCATION:ONLINE. Stay tuned for details.
CATEGORIES:ICN2 Manuel Cardona Lectures
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