Wide-Bandgap Metal Halide Perovskites for
Tandem Solar Cells
Metal haliad perovskite solar cells
(PSCs)
attractive features for photovoltaic (PV)
long carrier diffusion length
high absorption coefficient
high carrier mobility
low excition binding energy
ambipolar charge transport
Power Conversion Efficiency (PCE)
2009: 3.8%
2020: 25.5%
improving PV device efficiency
origin: single-junction solar cells
Ultimate PCE governed by Shockley-Quessier limit
primary energy loss
unabsorbed long-wavelength photons
thermalization of high energy carriers
tandem
better harness solor energy
absorbed high-energy photons by the upper wide-bandgap subcell
absorbed long-wavelength photons by the bottom low-bandgap subcell
by the bottom low-bandgap subcell
why choose perovskites for tandem solar cell
tunable bandgap
all-perovskite tandem
hybrid tandem
perovskite wide-bandgap
+
other low-bandgap PV technology
minimum additional cost
integrate with low-bandgap absorber
to raise the efficiency of tandem solar cells
additional absorser
Si
CIGS
Sn-Pb-based perovskite
Figure 1
most effort focius on 1.55-1.70eV perovskite
ideal bandgap (top:PSC)
1.7eV
Si
CIGS
1.8eV