Enhanced Thermal Stability of Planar Perovskite Solar Cells Through Triphenylphosphine Interface Passivation

Abstract

While extensive research has driven the rapid efficiency trajectory noted to date for organic-inorganic perovskite solar cells (PSCs), their thermal stability remains one of the key issues hindering their commercialization. Herein, a significant reduction in surface defects (a precursor to perovskite instability) could be attained by introducing triphenylphosphine (TPP), an effective Lewis base passivator, to the vulnerable perovskite/ spiro-OMeTAD interface. Not only did TPP passivation enable a high power conversion efficiency (PCE) of 20.22 % to be achieved, these devices also exhibited superior ambient and thermal stability. Unlike the pristine device, which exhibited a sharp descend to 16 % of its initial PCE on storing in relative humidity of 10 %, at 85 °C for more than 720 h, the TPPpassivated devices retained 71 % of its initial PCE. Hence, this study presents a facile yet excellent approach to attain highperforming yet thermally stable PSCs.

Construction of Efficient and Stable FAPbI3 Perovskite Solar Cells through Bifunctional Ionic Liquid‐Assisted Crystallization and Defect Passivation

“…[1][2][3][4][5][6][7] In the past decade, the record power conversion efficiency (PCE) of all-solid-state single-junction thin-film PSCs has jumped from 9.7% to 25.7%, mainly benefiting from the enormous compositional and interface engineering. [8][9][10][11][12][13][14] For PSCs achieving record PCE and stability, the perovskite layer was turned from the original MAPbI 3 -to FAPbI 3 -based compositions. Substituting MA with a slightly larger monovalent cation FA could reduce the bandgap of perovskite to approach the S-Q optimum.…”

Interface passivation using choline acetate for efficient and stable planar perovskite solar cells

“…In the pristine lm, there are two peaks assigned to metallic Pb 0 at 136.7 and 141.6 eV, while no metallic Pb 0 peak is observed in the passivated lm, suggesting that the ChAc suppresses the nonradiative recombination. 38,39 In order to determine the effect of ChAc on the optical properties of perovskite lms, the ultraviolet-visible (UV-vis) absorption and photoluminescence (PL) spectra were analyzed. The absorption spectra of pristine and passivated lms are illustrated in Fig.…”

Heteroacene-Based Polymer with Fast-Switching Visible–Near Infrared Electrochromic Behavior

“…Electrochromism is the color transition of a material in response to an applied electric field. Today, electrochromic materials have achieved application in electrochromic transistors, energy-saving tinted windows, infrared camouflage in the military, color displays, paper-based sensors, energy-storing devices, and supercapacitors . Optical properties are reversible in electrochromic materials when the material is oxidized or reduced electrochemically.…”