Highly stable air processed perovskite solar cells by interfacial layer engineering

Evaluation of the Passivation Effects of PEDOT:PSS on Inverted Perovskite Solar Cells

“…As presented in Figure 4b, X-ray diffraction (XRD) measurements are carried out to reveal the structure and crystallinity of MAPbI 3 perovskite films on PEDOT:PSS with and without polymer passivation. The XRD patterns of PEDOT:PSS/Perovskite, PEDOT:PSS/P1/ Perovskite, PEDOT:PSS/P2/Perovskite, and PEDOT:PSS/P3/ Perovskite films display the same diffraction peaks of 14.4° (110), 19.9°(112), 23.4°(211), 24.5°(202), 28.4°(220) 31.7°(310), and 35.02°(312), which are the characteristic peaks for tetragonal MAPbI 3 perovskite crystals. [75,76] The crystallinity and phase of the MAPbI 3 perovskite are not affected by the polymer passivation.…”

“…The XRD characteristics of the Sn-Pb-based perovskites with and without P2 are displayed in Figure S5d, Supporting Information. The XRD diffraction patterns of perovskite films on the control PEDOT:PSS and the PEDOT:PSS/P2 exhibit strong peaks at 14.2° and 28.5°, which can be assigned to (110) and (220) crystal planes, suggesting a highly preferred orientation of perovskite film growth. [141,142] Figure S5e, Supporting Information, shows PL spectra of the Sn-Pb-based perovskite films on control PEDOT:PSS and PEDOT:PSS with P2, and the typical peaks at ≈931 nm from Sn-Pb-based perovskite are observed.…”

“…[107] In addition, a lot of papers show a big mismatch between the J sc values obtained from J-V curves and EQE spectra. [108][109][110][111][112][113][114] Almora et al also considered this is very common in PSCs and OPVs. [115] The long-term stability of PSCs is measured under air conditions (≈25 °C and 20% RH) to further investigate the influence of the polymer on the device performance, as presented in Figure 8f.…”

Recent advances in the interfacial engineering of organic–inorganic hybrid perovskite solar cells: a materials perspective

“…Similarly, Ka et al reported the application of PbS-QDs as an interface modification layer for the HTL and the perovskite/HTL interface, respectively, where CuSCN was used as the HTL material instead of the expensive organic HTL. 127 The PbS-QDs were grown directly on the perovskite films using physical deposition, and two devices were subsequently prepared. They found that the PbS-QDs provided a beneficial passivation effect on the perovskite films, enabling better charge separation and collection.…”

Interpretation of slow electroluminescence and open circuit voltage transient response in Cs-based perovskite solar cells

“…3 Despite the impressive energy conversion efficiencies attained so far, 4 the rapidly growing knowledge base on optimum materials and preparation techniques emerged mostly empirically before attaining a solid knowledge of the critical physical mechanisms controlling the operation and degradation of PSC. [5][6][7][8][9][10] This is due in part to the complexity introduced by the presence of mobile ions in the perovskite, which was only later assured to originate the undesirable hysteresis of the current(J)/voltage(V) curve observed in most PSC. 11 Although these efforts in characterization and modeling allowed for several optimizations of PSC, yielding higher efficiencies and smaller degradation rates, [12][13][14] the potential benefits on performance and reduced degradation of further restricting ionic motion are constantly updated.…”