Sodium Dodecylbenzene Sulfonate Interface Modification of Methylammonium Lead Iodide for Surface Passivation of Perovskite Solar Cells

Abstract

Perovskite solar cells (PSCs) have been developed as a promising photovoltaic technology because of their excellent photovoltaic performance. However, interfacial recombination and charge carrier transport losses at the surface greatly limit the performance and stability of PSCs. In this work, the fabrication of high-quality PSCs based on methylammonium lead iodide with excellent ambient stability is reported. An anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), is introduced to simultaneously passivate the defect states and stabilize the cubic phase of the perovskite film. The SDBS located at grain boundaries and the surface of the active layer can effectively passivate under-coordinated lead ions and protect the perovskite components from water-induced degradation. As a result, a champion power conversion efficiency (PCE) of 19.42% is achieved with an open-circuit voltage (V OC ) of 1.12 V, a short-circuit current (J SC ) of 23.23 mA cm −2 , and a fill factor (FF) of 74% in combination with superior moisture stability. The SDBS-passivated devices retain 80% of their initial average PCE after 2112 h of storage under ambient conditions.

Efficient and Stable Carbon‐Based CsPbIBr2 Perovskite Solar Cells by 4‐Aminomethyltetrahydropyran Acetate Modification

“…[ 34–35 ] While the emission peak of the 4‐AMTHP‐Ac modified CsPbIBr 2 film appears at 603.3 nm, which is a redshift of 2.5 nm, indicated that the 4‐AMTHP‐Ac modified CsPbIBr 2 film shows a lower surface optical bandgap, thus allowing more light absorption from the sunlight spectrum than the pristine one. [ 36 ] Moreover, the PL peak intensity of the 4‐AMTHP‐Ac modified CsPbIBr 2 film is increased, indicating reduced nonradiative recombination and lower defect density. [ 37 ] The TRPL decay curves are fitted with a double exponential decay function, as shown in Figure 4b, and the relative parameters are listed in Table S1 (Supporting Information).…”

“…The fast decay component (A1) is the nonradiative recombination induced by the trap, and the slow decay component (A2) represents the radiative recombination of free carriers. [ 36 ] Compared with the pristine CsPbIBr 2 , the A1 of the 4‐AMTHP‐Ac modified CsPbIBr 2 film decreases, and the A2 increases. The average carrier lifetime also increases from 4.13 to 6.83 ns, indicating that the defects in the 4‐AMTHP‐Ac modified CsPbIBr 2 film are significantly passivated.…”

Hydrophobic Graphene Quantum Dots for Defect Passivation and Enhanced Moisture Stability of CH3NH3PbI3 Perovskite Solar Cells

“…The power conversion efficiency (PCE) of organic-inorganic hybrid (halide) perovskite solar cells (PSCs) has rapidly progressed in the last few years, from 3.8% in 2009 to 25.5% at present. [1][2][3][4][5][6] Rapid progress has been enabled by the outstanding optoelectronic properties of these perovskites, including long charge carrier diffusion lengths, a high optical absorption coefficient, balanced electron and hole mobilities, a long photogenerated carrier lifetime, low trap density, and small exciton binding energies. [7][8][9][10][11][12][13][14][15] However, due to low formation energies, the polycrystalline perovskite films contain crystallographic defects and grain boundaries (GBs) at the interface and in the bulk.…”

A Porphyrin-Involved Benzene-1,3,5-Tricarboxamide Dendrimer (Por-BTA) as a Multifunctional Interface Material for Efficient and Stable Perovskite Solar Cells

“…Undergoing about 10 years of rapid development, the power conversion efficiency (PCE) of organic–inorganic hybrid perovskite solar cells (PSCs) has reached 25.5% from the initial 3.8%, − which can be ascribed to the intrinsic advantages of the perovskite materials, such as high absorption coefficient, long hole/electron diffusion lengths, ideal charge mobility, adjustable band gap, etc. − However, due to the polycrystalline characteristics of the perovskite film in normal PSCs, defects are readily formed at the grain boundaries and on the surface of the films, which will function as the nonradiative recombination center decreasing the device performance. − Moreover, defects can accelerate the moisture-induced destruction of perovskite materials . Furthermore, the misalignment of energy levels near the interface between the perovskite/hole transport layer (HTL) in typical n-i-p PSCs will inevitably lead to recombination loss across interfaces .…”

“…37,38 The long and orderly π−π stacking structure could provide a good channel for charge transport. Inspired by this, we designed and synthesized a new porphyrin-involved dendrimer N 1 ,N 3 ,N 5 -tri(4-(10,20-di(4-dodecyloxyphenyl)porphyrin-5-yl)phenyl)-1,3,5-benzenetricarboxamide (hereafter abbreviated as Por-BTA, Figure 1a) for use as an efficient interface material between perovskite/HTM to improve the PSCs' device performance. The strong intermolecular aggregation could be achieved via the van der Waals forces induced by the dodecyloxyphenyl group at 10, 20 positions of porphyrin, along with the hydrogen-bonding interactions between the amide groups.…”