Synergistic Treatments of Bulk and Buried Surface in Tin‐Lead Binary Perovskite for Efficient Near‐Infrared Photodetectors

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 16, 2025

Abstract Tin‐lead binary perovskites, with their low bandgap and high absorption coefficient, hold great potential for application in near‐infrared (NIR) photodetectors. However, uncontrolled crystallization a defect density at the interface, particularly buried significantly hinder performance enhancement. To address this challenge, work incorporated quaternary ammonium salt tetrabutylammonium iodide (TBAI) into precursor solution. TBAPbI 3 formation energy accumulates rapidly bottom templates growth of 3D perovskite films, effectively reduces bulk density. Furthermore, also passivates FA + vacancy defect. These synergistic treatments passivate both surface defects varying nature, thereby limiting ingress oxygen film reducing oxidation Sn 2+ . The resulting photodetectors exhibited outstanding performance, including responsivity (0.53 A W −1 860 nm), an excellent detectivity (4.6 × 10 12 Jones), ultrafast response speed (93.2 ns), as well enhanced environmental stability. Leveraging its exceptional photoelectric flexible NIR photodetector is integrated wearable reflective oximetry detection system, achieving accurate non‐invasive assessment heart rate blood saturation. results highlight promising tin‐lead perovskites health monitoring applications.

Язык: Английский

N‐Type Doping Characteristics Enabled by 1D Perovskite for Advancing Perovskite Photovoltaics: From 1.55 to 1.85 eV Bandgap

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Abstract Developing low‐dimensional perovskites to enhance both single‐junction and tandem solar cells is of great interest for improving photovoltaic performance durability. Herein, a novel 1D perovskite based on 1,3‐thiazole‐2‐carboximidamide (TZC) cation introduced, which exhibits robust chemical interactions with PbI 2 3D perovskite, enabling the fabrication high‐quality mixed‐dimensional films identified by HR‐TEM GIWAXS analyses. Benefiting from lower formation energy barrier perovskites, they can preferentially form act as crystal seeds regulate crystallization kinetics optimized morphology improved crystallinity. In addition effectively passivating surface defects suppressing nonradiative recombination, TZC‐enabled exhibit pronounced n‐type doping characteristics, leading an elevated Fermi level (from −4.63 −4.44 eV) facilitating charge carrier extraction transport in p‐i‐n devices. As result, this strategy not only significantly enhances power conversion efficiency (PCE) widely studied 1.55 eV bandgap but also boosts PCE 1.68 1.85 wide‐bandgap devices, achieving outstanding PCEs 22.52% 18.65%, respectively. These findings highlight immense potential TZC‐functionalized enhancing high‐performance cell applications.

Язык: Английский

Ionic Liquid Top Surface Engineering: In Situ GIWAXS Insights Into 1D/3D Heterojunction Perovskite Formation

Small Methods, Год журнала: 2024, Номер unknown

Опубликована: Дек. 29, 2024

Abstract Low‐dimensional perovskites have been demonstrated repeatedly to improve the performance of perovskite photovoltaic devices in both light‐to‐electricity conversion efficiency and device durability. In this work, ionic liquid (IL) 1‐ethyl‐3‐methylimidazolium hydrogen sulfate (EMIMHSO 4 ) is innovatively introduced as a capping layer, which interacts with residual PbI 2 on 3D top surface generate 1D perovskite, EMIMPbI 3 . By adjusting concentration IL, formations distinct morphologies achieved. Time‐resolved GIWAXS studies allows track formation process surface. Moreover, at varying angles provide insights into IL's role management distribution. Further analyses, including situ PL ICP‐MS, demonstrates that layer effectively enhances stability final perovskite. This stabilization, combines defect passivation its effective , enables 1D/3D achieve PCE 25.01%, marked improvement over pristine device. Additionally, displays superior long‐term durability, retaining 94% initial after 2000 h nitrogen atmosphere, while maintains only 66% PCE.

Язык: Английский