Suppressed phase segregation for triple-junction perovskite solar cells

Atomic Layer Deposition-Free Monolithic Perovskite/Perovskite/Silicon Triple-Junction Solar Cells

“…14,15 Given the fixed bandgap energy (E g ; 1.12 eV) of the Si bottom cell, the optimal E g 's of the middle and top cells are 1.50−1.55 and 1.95−2.00 eV, respectively. In terms of the 1J cell performances, the p-i-n-type top cell with a wide E g exhibits much lower efficiencies (>13%) 16 than the middle cell with intermediate E g (>24%), 17,18 making it a challenge to increase the efficiency of the PVSK/PVSK/Si 3J tandem cells. Another important issue is degradation of the PVSK middle cell by the solvent during processing of the PVSK top cell.…”

Halide perovskite photovoltaic-electrocatalysis for solar fuel generation

“…The doping of Rb with a smaller cation radius than Cs reduces the average interatomic distance between the A-site cation and I, which enhances the ion migration energy barrier and suppresses ion migration. Time-dependent photoluminescence measure- 41% with a V oc of 1.312 V. All-perovskite triple-junction solar cells employing the Rb/Cs mixed cation inorganic perovskite as a top cell achieved a PCE of 24.3% with a V oc of 3.21 V. 119 Another subcell comprising the all-perovskite TSCs, NBG perovskite with a bandgap around 1.2 eV, is obtained by alloying the tin and lead from the B-site. The main factor that adversely affects the stability and device efficiency of NBG perovskite is the oxidation of Sn 2+ to Sn 4+ .…”

“…Time-dependent photoluminescence measurements under 1-sun illumination demonstrate that Rb/Cs mixed-cation perovskites show improved light stability. A single PSC device based on ∼2.0 eV Rb 0.15 Cs 0.85 Pb 1.75 Br 1.25 perovskite shows a PCE of 13.41% with a V oc of 1.312 V. All-perovskite triple-junction solar cells employing the Rb/Cs mixed cation inorganic perovskite as a top cell achieved a PCE of 24.3% with a V oc of 3.21 V. 119…”

Monolithic Two-Terminal Perovskite/Perovskite/Silicon Triple-Junction Solar Cells with Open Circuit Voltage >2.8 V

“…We note that higher V OC values have been reported for triplejunction solar cells using a perovskite or organic bottom cell. 31,32 However, a voltage difference is expected between the technologies, as the silicon solar cell has a lower voltage compared to the other two bottom cells with bandgaps of 1.2 and 1.3 eV for perovskite and organic solar cells, respectively. 31,32 On a final note, we noticed that even though the adapted processing minimizes the damage to the middle cell, in order to have better process reproducibility, it is crucial to improve the solvent barrier function of the interlayers.…”

“…31,32 However, a voltage difference is expected between the technologies, as the silicon solar cell has a lower voltage compared to the other two bottom cells with bandgaps of 1.2 and 1.3 eV for perovskite and organic solar cells, respectively. 31,32 On a final note, we noticed that even though the adapted processing minimizes the damage to the middle cell, in order to have better process reproducibility, it is crucial to improve the solvent barrier function of the interlayers. From the SEM top-view image (see Figure S8), island-like growth of the 1 nm Au on silicon is obvious, similar to what has been previously shown for 1 nm silver (Ag) layers.…”