Tandem solar cells
(SCs) based on perovskite and silicon represent
an exciting possibility for a breakthrough in photovoltaics, enhancing
SC power conversion efficiency (PCE) beyond the single-junction limit
while keeping the production cost low. A critical aspect to push the
tandem PCE close to its theoretical limit is the development of high-performing
semitransparent perovskite top cells, which also allow suitable near-infrared
transmission. Here, we have developed highly efficient semitransparent
perovskite SCs (PSCs) based on both mesoporous and planar architectures,
employing Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3 and FA0.87Cs0.13PbI2Br perovskites with band
gaps of 1.58 and 1.72 eV, respectively, which achieved PCEs well above
17 and 14% by detailed control of the deposition methods, thickness,
and optical transparency of the interlayers and the semitransparent
electrode. By combining our champion 1.58 eV PSCs (PCE of 17.7%) with
an industrial-relevant low-cost n-type Si SCs, a four-terminal (4T)
tandem efficiency of 25.5% has been achieved. Moreover, for the first
time, 4T tandem SCs’ performances have been measured in the
low light intensity regime, achieving a PCE of 26.6%, corresponding
to revealing a relative improvement above 9% compared to the standard
1 sun illumination condition. These results are very promising for
their implementation under field-operating conditions.
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