Radiative Efficiency Limit with Band Tailing Exceeds
30% for Quantum Dot Solar Cells
Version 2 2017-11-22, 05:31
Version 1 2017-10-25, 11:54
Posted on 2017-11-22 - 05:31
Thin
films of colloidal quantum dots (QDs) are promising solar
photovoltaic (PV) absorbers in spite of their disordered nature. Disordered
PV materials face a power conversion efficiency limit lower than the
ideal Shockley–Queisser bound because of increased radiative
recombination through band-tail states. However, investigations of
band tailing in QD solar cells have been largely restricted to indirect
measurements, leaving their ultimate efficiency in question. Here
we use photothermal deflection spectroscopy (PDS) to robustly characterize
the absorption edge of lead sulfide (PbS) QD films for different bandgaps,
ligands, and processing conditions used in leading devices. We also
present a comprehensive overview of band tailing in many commercial
and emerging PV technologiesincluding c-Si, GaAs, a-Si:H,
CdTe, CIGS, and perovskitesthen calculate detailed-balance
efficiency limits incorporating Urbach band tailing for each technology.
Our PDS measurements on PbS QDs show sharp exponential band tails,
with Urbach energies of 22 ± 1 meV for iodide-treated films and
24 ± 1 meV for ethanedithiol-treated films, comparable to those
of polycrystalline CdTe and CIGS films. From these results, we calculate
a maximum efficiency of 31%, close to the ideal limit without band
tailing. This finding suggests that disorder does not constrain the
long-term potential of QD solar cells.
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Jean, Joel; Mahony, Thomas S.; Bozyigit, Deniz; Sponseller, Melany; Holovský, Jakub; Bawendi, Moungi G.; et al. (2017). Radiative Efficiency Limit with Band Tailing Exceeds
30% for Quantum Dot Solar Cells. ACS Publications. Collection. https://doi.org/10.1021/acsenergylett.7b00923
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AUTHORS (7)
JJ
Joel Jean
TM
Thomas S. Mahony
DB
Deniz Bozyigit
MS
Melany Sponseller
JH
Jakub Holovský
MB
Moungi G. Bawendi
VB
Vladimir Bulović
KEYWORDS
detailed-balance efficiency limitsUrbach energiesquantum dotsCdTePbS QDs showPDS measurementsiodide-treated filmsQD filmsprocessing conditionsuse photothermal deflection spectroscopyband-tail statesUrbach bandQuantum Dot Solar Cellsabsorption edgeethanedithiol-treated filmsradiative recombinationband tailstechnologyRadiative EfficiencymeVDisordered PV materials faceCIGS filmspower conversion efficiency limit