Abstract
Incorporating 2.5% Cs in FA0.8MA0.2Sn0.5Pb0.5I3 improves the photo-stability of the low-bandgap perovskite solar cells. The champion device with power conversion efficiency of 18.9% maintain 92% of its initial efficiency after 120 min MPP tracking.
Highlights
The rapid growth in power conversion efficiency (PCE) of singlejunction organic–inorganic perovskite solar cells (PSCs) from 3.8% to 25.5% over the past few years[1,2] has attracted intensive attention and encouraged further investigations in the perovskite eld
Incorporating Cs in very small quantities enhances the operational photo-stability of LBG PSCs, such that the stabilized PCE (SPCE) of the PSCs with Cs2.5% and Cs5% maintain 92% and 99% of their initial values a er 120 min of maximum power point (MPP) tracking, respectively
The integrated JSC values calculated from the external quantum efficiency (EQE) responses of the PSCs with Cs0%, Cs1%, Cs2.5%, Cs5%, and Cs10% (Fig. S1d†) are 29.4, 29.5, 31.4, 29.0, 27.3 mA cmÀ2, respectively, which con rm the trend observed in the J–V scans
Summary
This class of materials is suited for both WBG top and LBG bottom solar cells in an all-perovskite tandem solar cell (all-PTSC) con guration.[9,10,11,12,13,14,15,16] All-PTSCs with current record PCEs of 25.4% for a 4T17 and 24.8% for a 2T18 con guration bene t from simple and potentially cost-effective fabrication processes via both solution[19] and vapor[20,21] deposition methods. Oxidation if exposed to the ambient environment.[38] The opencircuit voltage (VOC) and the short-circuit current (JSC) of MASn0.5Pb0.5I3 and FASn0.5Pb0.5I3 LBG PSCs are reported to be considerably improved by incorporating Cs into the crystal structure.[38] A recent study investigated the role of Cs when integrated into a double-cation FA0.5MA0.5Sn0.5Pb0.5I3 LBG perovskite.[48] According to the results, a strain reduction induced by the addition of Cs results in reduced trap densities, and improves the optoelectronic performance of the corresponding PSCs.[48] Aside from the above-mentioned studies, in which the incorporation of Cs was shown to effectively improve the efficiency of LBG PSCs, the possible effects of Cs incorporation in improving the photo-stability of Sn–Pb-based. Combining the highest-performing triple-cation LBG PSCs (Eg 1⁄4 1.26 eV) with semi-transparent double-cation PSCs (Eg 1⁄4 1.65 eV), we report on 4T all-PTSCs with PCE as high as 23.6%
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