Surface treatment of the perovskite via self-assembled dipole layer enabling enhanced efficiency and stability for perovskite solar cells

Simultaneous Defect Passivation and Electric Level Regulation with Rubidium Fluoride for High-Efficiency CsPbI2Br Perovskite Solar Cells

“…As presented in Figure c, compared to the control device, V TFL of RbF-treated device reduces from 0.72 to 0.53 V. Subsequently, the obtained V TFL could utilized to compare N trap of devices according to the following equation: N trap = 2εε 0 V TFL / qL 2 , where ε 0 represents the vacuum permittivity, ε is the relative permittivity, q denotes the electron charge, and L is the film thickness of CsPbI 2 Br perovskite. Accordingly, the decreased V TFL of the RbF-treated device should be inferred a lower N trap value than that of the pristine device, confirming the effective passivation on perovskite film, in agreement with the PL and TRPL decay curves . Then, the light intensity-dependent J–V curves of the assembled PSCs devices were recorded to determine the photoinduced charge recombination kinetics (Figure S5).…”

Towards cost-efficient and stable perovskite solar cells and modules: utilization of self-assembled monolayers

“…The V oc of the device increased from 1.08 to 1.16 V with a PCE of 21%. Kong and co-authors 116 used tetrabutylammonium chloride (TBAC, Fig. 19(b)) to self-assemble on the surface of the perovskite film.…”

Dipolar Interlayers in Perovskite Solar Cells

“…[39] Copyright 2018, The Royal Society of Chemistry. [44] Copyright 2022, Elsevier. c) Schematic diagram of the perovskite/spiro-OMeTAD interface treated with CPS (V x : halide vacancies).…”

“…Zhong et al reported that the PSC with a structure of ITO/SnO 2 /(FAPbI 3 ) 0.95 (MAPbBr 3 ) 0.05 /TBAC/spiro‐OMeTAD/Au delivered a greatly improved PCE of 23.5% compared with the PCE of 20.19% for the pristine device. [ 44 ] Furthermore, the TBAC dipolar interlayer protected the perovskite film from the H 2 O and O 2 damage and thereby enhanced the operational stability of PSCs. 4‐chlorobenzoic acid (4‐CBA) also can self‐assemble on the perovskite surface to form the monolayer with dipole moment.…”

“…Figure 4. a) Molecular structure of TBAC and schematic of TBAC monomolecular dipole layer on the perovskite surface; b) Energy-level alignment at the perovskite/spiro-OMeTAD interface with TBAC dipolar interlayer. Reproduced with permission [44]. Copyright 2022, Elsevier.…”