Synergistic Defect Passivation for Highly Efficient and Stable Perovskite Solar Cells Using Sodium Dodecyl Benzene Sulfonate

Abstract

Polycrystalline perovskite films with a lot of ionic defects and pinholes are the key factors to both the efficiency and stability of organic−inorganic halide perovskite devices. Here, an efficient additive modification process is reported for passivating defects in the perovskite film with sodium dodecyl benzene sulfonate (SDBS), leading to valid defect passivation of perovskite films and conspicuous improvement in both power conversion efficiency (PCE) and stability of mixed-cation perovskite solar cells (PSCs). Upon incorporating SDBS in perovskite precursor, the PCE of planar structure mixed-cation PSCs shows a best PCE of 20.88% with negligible hysteresis behavior (1.27), which are outstanding and better than that of the control PSCs (PCE = 19.15% and H-index = 8.18). The benzene sulfonic acid group of SDBS attracts lead ions of the perovskite and attaches on the surfaces of the perovskite crystal, which obviously slows down the process of perovskite crystallization and benefits from the highquality film with lower defect density preparation. Also, the long-chain alkyl groups of SDBS with hydrophobicity benefit from the perovskite film with better water stability. In addition, SDBS modification decreases the electron trap density, improving charge utilization, suppressing charge recombination, and resulting in an increase of the efficiency of the mixed-cation PSC devices. Moreover, PSCs with optimal SDBS passivation show a better ambient stability compared with the control PSCs. These results indicate that the synergistic interfacial passivation of SDBS in perovskites is beneficial in fabricating highly efficient and air stable PSCs.

Manipulating Ion Migration and Interfacial Carrier Dynamics via Amino Acid Treatment in Planar Perovskite Solar Cells

“…The peak intensity ratio of (110) to (310) is calculated to be 3.14 for the perovskite film deposited on SnO 2 with PAA treatment, which is higher than the 2.85 for the control one, implying the preferential orientation induced by the PAA layer . Compared with the reference one, the target MAPbI 3 film shows a narrower full width at half-maximum (FWHM) attributed to the better crystalline and the passivated defects at the ETL/MAPbI 3 interface . For a better understanding of the impact of the PAA layer on the carrier transfer and recombination processes, we investigate the optical properties of the samples with ITO/ETL/MAPbI 3 and ITO/ETL/PAA/MAPbI 3 configuration by steady-state photoluminescence (SSPL) and time-resolved photoluminescence (TRPL).…”

“…It has been demonstrated by electro-absorption spectroscopy (EA) and X-ray photoelectron spectroscopy (XPS) that hysteresis is originated from the built-in potential ( V bi ) change due to migrating ions . In this paper, we quantify the hysteresis using the hysteresis index (HI) defined by the following equation: …”

“…56 Compared with the reference one, the target MAPbI 3 film shows a narrower full width at half-maximum (FWHM) attributed to the better crystalline and the passivated defects at the ETL/ MAPbI 3 interface. 48 For a better understanding of the impact of the PAA layer on the carrier transfer and recombination processes, we investigate the optical properties of the samples with ITO/ETL/MAPbI 3 and ITO/ETL/PAA/MAPbI 3 configuration by steady-state photoluminescence (SSPL) and time-resolved photoluminescence (TRPL). As shown in Figure 2g, excited by the 470 nm light, the MAPbI 3 film deposited on PAA/SnO 2 exhibits a lower PL intensity, demonstrating the faster fluorescence quenching due to the improved electron extraction.…”

Single-Phase Organic–Inorganic Hybrid Nanoparticles for Warm-White Lighting

“…As shown in Figure , the characteristic signals centered at ∼2960, ∼2927, and ∼2864 cm –1 are assigned to the stretching vibrations of C–H for anionic alkyl chains in SDBS, − which indicates that it has a long alkyl chain in the obtained sample. The peak centered at ∼1457 cm –1 is ascribed to a C–H bending vibration, and two obvious peaks centered at ∼1182 and ∼1045 cm –1 are attributed to the antisymmetric and symmetric stretching vibrations of SO on SDBS. − The result shows that SDBS has grafted into the material of LaF 3 :Pr 3+ . An organic–inorganic hybrid material is formed.…”

Grain Boundary Defect Controlling of Perovskite via N‐Hydroxysuccinimide Post‐Treatment Process in Efficient and Stable n–i–p Perovskite Solar Cells

“…In this regard, it is one of most efficient strategies to passivate the surface defects at the interface of each functional layer or perovskite grain boundary in a complete device. For the typical planar ni-p-structured PSCs, the surface ion vacancies and hanging bonds are primary defects due to the intrinsic ionic crystal of the perovskite at device interface, [11,12] which results in trap-assisted recombination with energy deficit. In addition, the energy-level dislocation at the interface will also increase the recombination speed, [13] which limits the overall performance of V OC and devices.…”