posted on 2018-12-10, 00:00authored byXiao Luo, Tao Ding, Xue Liu, Yuan Liu, Kaifeng Wu
We introduce and demonstrate the
concept of quantum-cutting luminescent
solar concentrators (QC-LSCs) using Yb3+-doped perovskite
nanocrystals. These NCs feature a photoluminescence quantum yield
approaching 200% and virtually zero self-absorption loss of PL photons,
defining a new upper limit of 150% for the internal optical efficiency
(ηint) of LSCs that is almost independent of LSC
sizes. An un-optimized 25 cm2 QC-LSC fabricated from Yb3+-doped CsPbCl3 NCs already displayed an ηint of 118.1 ± 6.7% that is 2-fold higher than previous
records using Mn2+-doped quantum dots (QDs). If using CsPbClxBr3–x NCs
capable of absorbing ∼7.6% of solar photons, the projected
external optical efficiency (ηext) of QC-LSCs can
exceed 10% for >100 cm2 devices, which still remains
a
challenge in the field. The advantage of QC-LSCs over conventional
QD-LSCs becomes especially obvious with increasing LSC sizes, which
is predicted to exhibit a more than 4-fold efficiency enhancement
in the case of window-size (1 m2) devices.