Au Nanocluster Assisted Microstructural Reconstruction for Buried Interface Healing for Enhanced Perovskite Solar Cell Performance

Abstract

The heterogeneity of perovskite film crystallization along the vertical direction leads to voids and traps at the buried interfaces, hampering both efficiency and stability of perovskite solar cells. Here, bovine serum albumin‐functionalized Au nanoclusters (ABSA), combined with heavy gravity, high surface charge density, and strong interactions with the electron transport layer, are designed to reconstruct the buried interfaces for not only high‐quality crystallization, but also improved carrier transfer. The ABSA macromolecules with amine function groups and larger surface charge density interact with the perovskite to improve the crystallinity, and gradually migrate towards the buried interface, healing the defective voids, hence suppressing surface recombination velocity from 3075 to 452 cm s−1. The healed buried interface and the higher surface potential of ABSA‐modified TiO2 lead to improved carrier extraction at the interface. The resulting solar cell attains a power conversion efficiency of 25.0% with negligible hysteresis and remarkable stability, maintaining 92.9% of their initial efficiency after 3200 h of exposure to the ambient atmosphere, they also exhibit better continuous irradiation stability compared to control devices. These findings provide a new metal‐protein complex to eliminate the deleterious voids and defects at the buried interface for improved photovoltaic performance and stability.

Construction Au/FAPbI3 Schottky Heterojunction towards a High-Speed Electron Transfer Channel for High-Performance Perovskite Quantum Dot Solar Cells

“…Comparing the ground-state bleaching (GSB) of the Au/FAPbI 3 film to the FAPbI 3 film, the former appears weaker. This phenomenon results from more efficient electron transfer from the Au/FAPbI 3 film to the SnO 2 electron transport layer through HETC. , Carrier dynamics were extracted from GSB decay data using the exponential fitting approach (Figure S21 and Table S7), where τ 1 and τ 2 correspond to the charge transfer process and nonradiative recombination, respectively. The average lifetime (τ ave ) decreased from 3755.24 ps to 2880.48 ps , indicating that Au/FAPbI 3 films exhibit more effective electron transport compared to FAPbI 3 films .…”

Enhancement of Efficiency of Perovskite Solar Cells with Hole-Selective Layers of Rationally Designed Thiazolo[5,4-d]thiazole Derivatives

“…Perovskite solar cells (PSCs), valued for their high power conversion efficiency (PCE), solution processability, and finely adjustable energy levels, have recently attracted considerable attention. − Their versatility is apparent in a variety of applications, from PSCs functioning optimally under one-sun illumination to indoor PSC (iPSCs) capable of harnessing energy from artificial lighting. − However, PSCs have yet to play an important role in the photovoltaic market, primarily due to certain limitations related to their relatively low stability in comparison to mature Si–PV devices. In order to improve the performance and stability of PSCs, numerous researchers have focused on interfacial engineering between carrier transport layers (CTLs) and perovskite layers. − Charge-selective materials and interfacial layers (IFLs) play crucial roles in the performance of PSCs.…”