Efficient two-terminal all-perovskite tandem solar cells enabled by high-quality low-bandgap absorber layers

Vacuum‐Assisted Growth of Low‐Bandgap Thin Films (FA0.8MA0.2Sn0.5Pb0.5I3) for All‐Perovskite Tandem Solar Cells

“…Making use of the large columnar LBG perovskite grains produced by VAGC in this work, PSCs with PCE as high as 18.2% are demonstrated, exceeding the 15.4% of reference devices prepared by the established antisolvent method (Figure 1d). It should be noted that, to date, this represents one of the highest PCEs of the LBG PSC based on pure iodine halogen without incorporation of Br − , [28] Cl − [31] nor incorporation of additives such as GuaSCN. The long-term MPP tracking of the prepared devices by VAGC and the antisolvent method shows similar photo-stability for PSC prepared by VAGC compared to the antisolvent method ( Figure S1, Supporting Information) for devices stored at 25 °C in N 2 atmosphere.…”

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enormous interest in perovskite-based multi-junction photovoltaics (PV). [8][9][10] While tandem PV technologies based on market-dominant crystalline Si and CIGS bottom solar cells have recently demonstrated PCEs exceeding 28%, [6,11] all-perovskite tandem solar cells are still less advanced. [8][9][10] While tandem PV technologies based on market-dominant crystalline Si and CIGS bottom solar cells have recently demonstrated PCEs exceeding 28%, [6,11] all-perovskite tandem solar cells are still less advanced.

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“…While the research on WBG perovskite solar cells has advanced rapidly over the past decade, LBG perovskite solar cells lack PCE as well as stability. [9,12] It should be noted that these high PCEs are demonstrated exclusively for devices processed and characterized in an inert atmosphere. The reported perovskite thin films processed by VAGC exhibit large columnar crystals.…”

“…[4] Moreover, the wide range of bandgaps (E G ) of this class of materials generates Adv. [9,12] It should be noted that these high PCEs are demonstrated exclusively for devices processed and characterized in an inert atmosphere. [8,10,13] In this regard, the exact ratio of Sn to Pb is critical, since the incorporation of Pb in the Sn-based perovskite matrix increases the charge-carrier lifetime and decreases the E G (to below the E G of pure Sn-based perovskite materials) at the same time.…”

“…In particular, employing the VAGC to fabricate LBG PSCs (E G ≈ 1.27 eV), a high PCE of 18.2% is demonstrated which is among one of the highest reported pure iodine-based LBG PSCs (with no additives such as Br − , [28] Cl − , [31] and GuaSCN [12] ). In particular, employing the VAGC to fabricate LBG PSCs (E G ≈ 1.27 eV), a high PCE of 18.2% is demonstrated which is among one of the highest reported pure iodine-based LBG PSCs (with no additives such as Br − , [28] Cl − , [31] and GuaSCN [12] ).…”