Iodide/triiodide redox shuttle-based additives for high-performance perovskite solar cells by simultaneously passivating the cation and anion defects

Abstract

Halide perovskite solar cells (PSCs) have received remarkably increasing interests due to the facile fabrication procedures, cost-effective raw materials and skyrocketed power conversion efficiencies (PCEs) during the past 10 years....

The role of Pb oxidation state of the precursor in the formation of 2D perovskite microplates

“…More recently, other works suggested that introducing I 3 − during 3D perovskite formation helps prevent/regenerate point defects, like metallic lead. 61,62 This indicates that the spontaneous iodine oxidation when using PbO 2 as precursor naturally provides the right chemical environment to produce high quality BAPI.…”

I–/I3– Redox-Assisted Synthesis and Properties of Low Dimensional, Mixed-Valent Gold Iodide Perovskite Derivatives

“…The general utility of the I – /I 3 – redox couple is relatively commonplace, as seen with its continuing use in the electrolyte of dye-sensitized solar cells (DSCs), while the redox chemistry of iodine has recently been explored for use in several types of rechargeable batteries . In addition, organic triiodides have been used as intermediates in the synthesis of MAPbI 3 perovskite films or as a defect scavenger in lead-based perovskite solar cells . In a similar fashion, iodide has been shown to react with oxygen in aqueous solutions , to form I 2 , which quickly forms I 3 – in the presence of additional I – (eq , k = 5.6 × 10 9 L mol –1 s –1 , K eq = 710 L mol –1 in H 2 O at ambient temperatures).…”

Lead‐Free All‐Inorganic Cesium Bismuth Iodide‐Based Perovskite Solar Cells: Recent Advances, Current Limitations, and Future Prospects

“…Besides the development of multifunctional organic additives for CBI-based PSCs, inorganic potassium iodide (KI) was demonstrated as a promising defect-passivating additive in organic-inorganic perovskites utilizing surplus iodide species of KI additive to suppress the halide vacancies of perovskite films. [137][138][139][140] As for the CBI-based PSCs, Hamukwaya et al incorporated KI as functional additives to improve the crystallinity and grain sizes as well as to stabilize the crystal structures of Cs 3 Bi 2 I 9 films. [66] Consequently, the carbon electrode-based cell with optimized KI amount (2 vol%) exhibited a much superior PCE of 2.81% (Figure 7e) to that of the control device (0.28%) due to optimized surface morphology (Figure 7f ), increased diffusion potential, and suppressed interfacial energy barrier.…”