The data is the basis for all Figures in the manuscript and Supporting Information.This work was supported by the ERC [grant numbers 259619 PHOTO-EM,312483 ESTEEM2], EPSRC [grant numbers EP/M005143/1, EP/G060738/1, EP/G037221/1], and the CNPq [grant number 246050/2012-8]

Bakulin, Artem A.

Böhm, Marcus L.

Davis, Nathaniel J. L. K.

Ducati, Caterina

Ehrler, Bruno

Greenham, Neil C.

Jellicoe, Tom C.

Tabachnyk, Maxim

Wisnivesky-Rocca-Rivarola, Florencia

PubMed

Multiple exciton generation (MEG) in semiconducting quantum dots is a process that produces multiple charge-carrier pairs from a single excitation. MEG is a possible route to bypass the Shockley-Queisser limit in single-junction solar cells but it remains challenging to harvest charge-carrier pairs generated by MEG in working photovoltaic devices. Initial yields of additional carrier pairs may be reduced due to ultrafast intraband relaxation processes that compete with MEG at early times. Quantum dots of materials that display reduced carrier cooling rates (e.g., PbTe) are therefore promising candidates to increase the impact of MEG in photovoltaic devices. Here we demonstrate PbTe quantum dot-based solar cells, which produce extractable charge carrier pairs with an external quantum efficiency above 120%, and we estimate an internal quantum efficiency exceeding 150%. Resolving the charge carrier kinetics on the ultrafast time scale with pump-probe transient absorption and pump-push-photocurrent measurements, we identify a delayed cooling effect above the threshold energy for MEG.M.L.B. thanks the German National Academic Foundation (Studienstiftung) for funding. This work was supported by the EPSRC (grant numbers EP/M005143/1, EP/G060738/1, EP/G037221/1) and the ERC (grant number 259619 PHOTO-EM). M.T. thanks the Gates Cambridge Trust and the Winton Programme for Sustainability for financial support. N.J.L.K.D. thanks the Cambridge Commonwealth European and International Trust, Cambridge Australian Scholarships and Mr Charles K Allen for financial support. F.W.R.R. thanks financial support from CNPq (grant number 246050/2012-8). C.D. acknowledges financial support from the EU under grant number 312483 ESTEEM2. A.A.B. is a Royal Society Research Fellow.This is the final version of the article. It first appeared from ACS via http://dx.doi.org/10.1021/acs.nanolett.5b0316

Böhm, Marcus L

Jellicoe, Tom C

Davis, Nathaniel JLK

Bakulin, Artem A

Greenham, Neil C

Apollo (Cambridge)

Lead Telluride Quantum Dot Solar Cells Displaying External Quantum Efficiencies Exceeding 120%.

Multiple
exciton generation (MEG) in semiconducting quantum dots is a process
that produces multiple charge-carrier pairs from a single excitation.
MEG is a possible route to bypass the Shockley-Queisser limit in single-junction
solar cells but it remains challenging to harvest charge-carrier pairs
generated by MEG in working photovoltaic devices. Initial yields of
additional carrier pairs may be reduced due to ultrafast intraband
relaxation processes that compete with MEG at early times. Quantum
dots of materials that display reduced carrier cooling rates (e.g.,
PbTe) are therefore promising candidates to increase the impact of
MEG in photovoltaic devices. Here we demonstrate PbTe quantum dot-based
solar cells, which produce extractable charge carrier pairs with an
external quantum efficiency above 120%, and we estimate an internal
quantum efficiency exceeding 150%. Resolving the charge carrier kinetics
on the ultrafast time scale with pump–probe transient absorption
and pump–push–photocurrent measurements, we identify
a delayed cooling effect above the threshold energy for MEG

Marcus L. Böhm (1234881)

Tom C. Jellicoe (1234899)

Maxim Tabachnyk (1234896)

Nathaniel
J. L. K. Davis (1234887)

Florencia Wisnivesky-Rocca-Rivarola (1234890)

Caterina Ducati (1234884)

Bruno Ehrler (1234878)

Artem A. Bakulin (1234893)

Neil C. Greenham (1234902)

FigShare

Lead Telluride Quantum Dot Solar Cells Displaying External Quantum Efficiencies
Exceeding 120%

https://www.repository.cam.ac.uk/bitstream/handle/1810/252371/B%c3%b6hm%20et%20al.%202015%20Nano%20Letters.pdf?sequence=3&isAllowed=y

Research data supporting "Lead Telluride Quantum Dot Solar Cells Displaying External Quantum Efficiencies Exceeding 120%"

Research data supporting "Lead Telluride Quantum Dot Solar Cells Displaying External Quantum Efficiencies Exceeding 120%"

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Apollo (Cambridge)

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