Stabilizing Top Interface by Molecular Locking Strategy with Polydentate Chelating Biomaterials toward Efficient and Stable Perovskite Solar Cells in Ambient Air

Abstract

The instability of top interface induced by interfacial defects and residual tensile strain hinders the realization of long‐term stable n‐i‐p regular perovskite solar cells (PSCs). Herein, we report one molecular locking strategy to stabilize top interface by adopting polydentate ligand green biomaterial 2‐deoxy‐2,2‐difluoro‐D‐erythro‐pentafuranous‐1‐ulose‐3,5‐dibenzoate (DDPUD) to manipulate the surface and grain boundaries of perovskite films. Both experimental and theoretical evidences collectively uncover that the uncoordinated Pb2+ ions, halide vacancy and/or I‐Pb anti‐site defects can be effectively healed and locked by firm chemical anchoring on the surface of perovskite films. The ingenious polydentate ligand chelating is translated into reduced interfacial defects, increased carrier lifetimes, released interfacial stress and enhanced moisture resistance, which should be liable for strengthened top interface stability and inhibited interfacial nonradiative recombination. The universality of the molecular locking strategy is certified by employing different perovskite compositions. The DDPUD modification achieves an enhanced power conversion efficiency (PCE) from 23.17% to 24.47%, which is one of the highest PCEs ever reported for the devices prepared in ambient air. The unsealed DDPUD‐modified devices maintain 98.18% and 88.10%of their initial PCEs after more than 3000 h under a relative humidity of 10–20% and after 1728 h at 65°C, respectively.This article is protected by copyright. All rights reserved

The tricyclic alkaloid catalyzed crystallization of α-FAPbI3 for high performance antisolvent-free perovskite solar cells

“…The chemical shift of –CH (position 3) on FAI shifted in the downfield direction (157.15 → 157.19 ppm), reducing the shielding effect, which again proved the interaction with FAI and CO (position 2). 34 According to the calculation (Fig. S1, ESI†) these two interactions can be ascribed to the coordination bond and hydrogen bond, respectively, for CO at position 1 and position 2 on the Ch molecule.…”

Inhibition of ion diffusion/migration in perovskite p–n homojunction by polyetheramine insert layer to enhance stability of perovskite solar cells with p–n homojunction structure

“…8–13 To promote the transport efficiency of photo-generated carriers and lessen the undesired non-radiative recombination, various efficient modification methods, such as passivation strategy, 2D/3D interface engineering and energy band alignment strategy, have been developed. 14–20 Moreover, ingenious structural design, such as bulk heterojunction structure, perovskite–perovskite tandem structure and graded perovskite homojunction structure, have been certified to be valid for inhibiting carrier recombination in PSCs. 21–27 Therefore, the utilization of modification materials and innovative structures are beneficial to suppress carrier losses and enable a PCE closer to the theoretical value.…”

Lead‐Chelating Intermediate for Air‐Processed Phase‐Pure FAPbI3 Perovskite Solar Cells

“…[25] FA-based perovskite films are particularly susceptible to moisture-induced phase transformation from the desired α-FAPbI 3 to the non-photoactive δ-FAPbI 3 , further compounding the challenges in humid environments. [26][27][28][29] As a result, FA-based PSCs processed in humid conditions often exhibit a marked decrease in PCE compared to those processed under inert gas conditions. [30][31][32] Developing methodologies for the production of phasepure FAPbI 3 -based PSCs with enhanced stability and performance in ambient air is desired.…”