High-performance Ruddlesden–Popper two-dimensional perovskite solar cells via solution processed inorganic charge transport layers

Abstract

Long-term stability and suppressed power-conversion efficiency degradation achieved with inorganic charge transport layers.

Electron Transport Layer-Free Ruddlesden–Popper Two-Dimensional Perovskite Solar Cells Enabled by Tuning the Work Function of Fluorine-Doped Tin Oxide Electrodes

“…The integrated J sc from the IPCE responses are 16.3 and 18.2 mA cm −2 for PSCs fabricated on bare FTO and FTO/PEIE, which are only 1.6-2.4% different from the values in the J-V characteristics. As shown in Figure 4c, the best-performing PSC on FTO/PEIE exhibited a high PCE of 13.0%, which is comparable to (BA) 2 (MA) 3 Pb 4 I 13 -based 2D PSCs with ETL [28][29][30][31]. Under reverse scan, a slightly higher PCE of 13.3% was obtained, indicating a hysteresis degree of 2.3%.…”

Improving the performance of ternary organic solar cells using metal oxides as charge-transport layers

“…This presents a reduced charge-transport resistance and enhanced charge transportation when using NiO x /SnO 2 as the CTLs. As indicated from previous studies, NiO x and SnO 2 have high intrinsic carrier mobility values and their energy band structures are beneficial for hole and electron transportation from the active layer to the electrodes, 30,32 which leads to a decrease in the R ct of the OSCs. Moreover, the R s of NiO x /SnO 2 -based OSCs is 22.5 O, which is also lower than that (28.7 O) of the PEDOT:PSS/LiF-based control group.…”

“…Compared with PEDOT:PSS, NiO x has a deeper valence band (VB) of −5.3 eV, which is very close to the highest occupied molecular orbital (HOMO; −5.5 eV) level of PM6. 30 The deep VB and high conduction band (CB) levels are beneficial for hole extraction and electron blocking from the active layers. On the cathode side, the CB level of SnO 2 is −4.3 eV, 31 which lies just between the lowest unoccupied molecular orbital (LUMO; −5.5 eV) level of PM6 and the work function (−4.3 eV) of the Ag electrode.…”

High-performance Ruddlesden–Popper two-dimensional perovskite solar cells using integrated electron transport materials of tin oxide and indacenodithiophene

“…The increased slope indicates the suppressed bi-molecular charge recombination in the PSCs upon using SnO 2 /IDIC, which occurs at the interface of perovskite and charge transport layers. 45 From the dependence of V oc and light density shown in Fig. S4 (ESI†), the control PSCs showed a slope of 1.51 kT / e , where k is the Boltzmann constant, and T is the absolute temperature.…”