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SUMMARY:Unveiling Charge Carrier Dynamics in Atomically-Thin Semiconductors
  through Spectroscopy, Electrochemistry, and Theory
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20230525T160000
UID:2026-04-29-11-42-46@natsci.colostate.edu
DTSTAMP:20260429T114246
Description:Thermalization loss of absorbed solar energy above the semicond
 ucting active-material bandgap is the largest limiting factor of efficienc
 y in solar energy conversion devices1. Extraction of highly excited (hot) 
 charge carriers before thermalization loss can improve device efficiency b
 y up to 33%2. Single monolayer transition metal dichalcogenides (2D TMDs) 
 are a promising active material for hot carrier devices due to their broad
  visible light absorption\, atomically thin structure\, and slow hot carri
 er cooling3. A crucial step towards design of commercial hot carrier devic
 es is understanding how operational device conditions affect hot carrier d
 ynamics. Using an unprecedented combination of photoelectrochemical and in
  situ transient absorption spectroscopy measurements\, we demonstrate ultr
 afast (&lt\;50 fs) hot exciton and free carrier extraction under applied b
 ias in a proof-of-concept photoelectrochemical solar cell made from earth-
 abundant and potentially inexpensive monolayer MoS2. Our theoretical inves
 tigations of the spatial distribution of exciton states suggest that great
 er electronic coupling between hot C-exciton states located on peripheral 
 S atoms and neighboring contacts likely facilitates ultrafast charge trans
 fer. Additionally\, we reveal that the broadening and shifting of optical 
 spectra of 2D TMDs arises from the formation of negative trions. We do thi
 s by fitting an ab initio based\, many-body model to our experimental phot
 oelectrochemical data. Overall\, our study sheds light on the mechanisms u
 nderlying charge carrier dynamics in 2D TMDs and provides insight for the 
 design and optimization of hot carrier devices for solar energy conversion
 .\n\nReferences\n\n[1] Wolf\, M. A new look at silicon solar cell performa
 nce. Energy Convers. 1971\, 11.\n\n[2] Ross\, R. T. &amp\; Nozik\, A. J. E
 fficiency of hot-carrier solar energy converters. J. Appl. Phys. 1982\, 53
 \, 3813–3818.\n\n[3] Wang\, L. et al. Slow cooling and efficient extract
 ion of C-exciton hot carriers in MoS2 monolayer. Nat. Commun. 2017\, 8\, 1
 3906. 4:00 pm
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